{"gene":"AGRP","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1997,"finding":"AGRP (then called ART) was identified as a hypothalamic neuropeptide structurally related to agouti protein, acting as a potent selective antagonist of melanocortin receptors MC3R and MC4R. Recombinant AGRP inhibited melanocortin receptor signaling, and ubiquitous overexpression in transgenic mice caused obesity without altering pigmentation, establishing AGRP as a downstream mediator of leptin signaling in body weight regulation.","method":"Recombinant protein pharmacology at cloned melanocortin receptors; transgenic mouse overexpression; in situ hybridization showing arcuate nucleus-restricted expression; expression elevated ~10-fold in ob/ob and db/db mice","journal":"Science; Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — two independent labs, receptor antagonism assays, transgenic models, replicated","pmids":["9311920","9119224"],"is_preprint":false},{"year":1997,"finding":"Ubiquitous overexpression of the human AGRP cDNA in transgenic mice caused obesity, demonstrating that AGRP itself (not just agouti) promotes weight gain through a melanocortin receptor-dependent mechanism.","method":"Transgenic mouse overexpression of human AGRP cDNA","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — clean transgenic gain-of-function with defined obesity phenotype","pmids":["9354787"],"is_preprint":false},{"year":1998,"finding":"The C-terminal fragment AGRP(83-132) administered intracerebroventricularly increased food intake for up to 24 hours and blocked alpha-MSH-induced feeding reduction, demonstrating that the C-terminal domain is sufficient for MC3R/MC4R antagonism and long-lasting orexigenic activity in vivo.","method":"ICV injection in rats; in vitro cAMP inhibition assay at MC3R and MC4R","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro receptor assay combined with in vivo ICV pharmacology","pmids":["9751529"],"is_preprint":false},{"year":1998,"finding":"The disulfide bond structure of recombinant human AGRP was determined biochemically: five disulfide bonds were identified with connectivity C67-C82, C74-C88, C81-C99, C85-C109, C90-C97, homologous to omega-agatoxin IVB, establishing the cysteine-knot scaffold.","method":"Stepwise partial reduction with TCEP, alkylation with NEM or fluorescein-maleimide, peptide mapping, sequence analysis, and mass spectrometry","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — direct biochemical determination of disulfide connectivity with multiple orthogonal methods","pmids":["9724530"],"is_preprint":false},{"year":1999,"finding":"AGRP binds specifically to melanocortin receptors MC3R, MC4R, and MC5R but not MC1R or MC2R. The C-terminal domain AGRP(87-132) is equipotent to full-length AGRP for receptor binding and inhibition of alpha-MSH-stimulated cAMP. The RFF triplet (residues 111-113) and the loop defined by Cys-110 to Cys-117 are critical for receptor binding affinity and antagonism.","method":"Chemical protein synthesis of AGRP variants; radioiodinated [125I]AGRP(87-132) binding assays; competitive displacement with NDP-MSH; cAMP inhibition assays at cloned melanocortin receptors","journal":"Molecular endocrinology; Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted binding with synthetic protein, mutagenesis, replicated across two labs","pmids":["9892020","9893984"],"is_preprint":false},{"year":1999,"finding":"Extracellular loops 2 and 3 (exoloops 2 and 3) of MC4R are critical determinants of AGRP binding specificity. Swapping exoloops 2 and 3 from MC4R into MC1R conferred AGRP binding to MC1R, while the reverse substitutions abolished AGRP binding at MC4R, without affecting alpha-MSH binding.","method":"Chimeric receptor constructs of MC1R and MC4R expressed in cells; AGRP(87-132) binding assays; cAMP inhibition assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — chimeric receptor mutagenesis with binding and functional assays","pmids":["10318826"],"is_preprint":false},{"year":1999,"finding":"NMR structure of minimized AGRP (MARP, 46 residues, C-terminal region) revealed three major loops with four of five disulfide bridges at the base; the fold lacks canonical secondary structure despite being well-defined, challenging earlier toxin-homology models based on cysteine spacing alone.","method":"2D 1H NMR of chemically synthesized MARP","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — NMR structure determination of chemically synthesized protein","pmids":["10371151"],"is_preprint":false},{"year":2001,"finding":"High-resolution NMR structure of AGRP(87-132) showed a three-stranded antiparallel beta-sheet with the inhibitor cystine knot (ICK) fold — the first mammalian protein assigned to the ICK superfamily. The Arg-Phe-Phe triplet is presented by the hairpin turn for melanocortin receptor binding, and a second contact loop in the first 16 residues confers MC3R/MC4R selectivity distinct from agouti's MC1R preference.","method":"1H NMR at 800 MHz of chemically synthesized AGRP(87-132)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — high-resolution NMR structure with functional interpretation","pmids":["11747427"],"is_preprint":false},{"year":2001,"finding":"Ghrelin stimulates feeding via activation of NPY/AGRP neurons in the hypothalamus. Intracerebroventricular ghrelin induced Fos expression in NPY and AGRP neurons; antibodies and antagonists against NPY and AGRP abolished ghrelin-induced feeding, demonstrating that AGRP signaling is required downstream of ghrelin for its orexigenic effect.","method":"ICV ghrelin injection in rats; Fos immunohistochemistry; ICV antibody and antagonist blockade; ghrelin receptor-deficient rats","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — pharmacological epistasis with antibody blockade and antagonists, replicated","pmids":["11196643"],"is_preprint":false},{"year":2001,"finding":"NMR structure and pharmacology of a designed 34-residue AGRP mini-protein (cystine knot only) confirmed that the cystine knot domain alone contains the melanocortin receptor contact points and is sufficient for antagonist activity with the same MC3R/MC4R selectivity profile as AGRP(87-132).","method":"NMR structure determination; binding and cAMP inhibition assays at MC3R and MC4R","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — structure plus pharmacological validation, mutagenesis by domain deletion","pmids":["12056887"],"is_preprint":false},{"year":2002,"finding":"RNA interference-mediated reduction (~50%) of hypothalamic AGRP mRNA and peptide increased metabolic rate and reduced body weight without changing food intake, demonstrating a role for AGRP in regulating energy expenditure independently of feeding behavior.","method":"RNAi in vivo in rat hypothalamus; AGRP peptide immunoreactivity; metabolic rate measurement","journal":"BMC neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function with metabolic phenotype, single lab","pmids":["12423556"],"is_preprint":false},{"year":2003,"finding":"Zebrafish AGRP is a conserved ortholog (36-40% identity to human/mouse) expressed exclusively in the hypothalamus, and its transcript is significantly upregulated by fasting while POMC is unchanged, demonstrating conservation of the melanocortin system regulation by metabolic state in teleosts.","method":"cDNA cloning; RT-PCR; in situ hybridization; fasting experiments in adult zebrafish","journal":"Endocrine","confidence":"Medium","confidence_rationale":"Tier 2-3 — ortholog characterization with expression and fasting regulation; single lab","pmids":["14709799"],"is_preprint":false},{"year":2004,"finding":"A 42.5-kb genomic region upstream of Agrp, containing three evolutionarily conserved regions between mouse and human, is necessary and sufficient for arcuate nucleus-specific and fasting-responsive Agrp expression, as tested with BAC reporter constructs in transgenic mice.","method":"BAC transgenic reporter mice with varying flanking sequence; in situ hybridization and reporter expression in transgenic lines","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic reporter deletion analysis defining regulatory regions","pmids":["15345681"],"is_preprint":false},{"year":2005,"finding":"Leptin and insulin directly inhibit AGRP peptide release from perifused rat hypothalamus in vitro: both leptin (10nM-100nM) and insulin (100nM) significantly decreased depolarization-stimulated AGRP release. Fasting decreased the gamma3-MSH/AGRP release ratio, indicating a shift toward net melanocortin receptor inhibition.","method":"Perifused rat hypothalamic slice preparation; radioimmunoassay of AGRP and gamma3-MSH peptide release","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 — direct peptide release assay from hypothalamic tissue, multiple hormone conditions tested","pmids":["15680952"],"is_preprint":false},{"year":2006,"finding":"FoxO1 mediates leptin-regulated Agrp transcription by opposing Stat3 action. A constitutively nuclear FoxO1 in the arcuate nucleus abolished leptin's ability to suppress Agrp expression and food intake. FoxO1 and Stat3 exert opposing actions at Agrp and Pomc promoters through coactivator-corepressor exchange: FoxO1 promotes coactivator recruitment at Agrp and corepressor recruitment at Pomc.","method":"Adenoviral delivery of FoxO1 mutants to arcuate nucleus; chromatin immunoprecipitation; promoter-reporter assays; in vivo feeding and gene expression studies","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (viral gene delivery, ChIP, reporter assays, in vivo phenotype)","pmids":["16604086"],"is_preprint":false},{"year":2006,"finding":"AGRP acts as an inverse agonist at MC4R: it reduces basal cAMP production below constitutive activity. The N-terminus and distal C-terminus of MC4R are required for AGRP inverse agonism. Residues D90 in TM2 and D298 in TM7 of MC4R are essential for both NDP-MSH activation and AGRP inverse agonism.","method":"Chimeric MC4R/MC1R receptors; site-directed mutagenesis (D90A, D298A); cAMP assays in transfected cells","journal":"Regulatory peptides","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of receptor combined with chimeric receptor analysis and functional assays","pmids":["16820227"],"is_preprint":false},{"year":2006,"finding":"AGRP induces beta-arrestin-mediated endocytosis of MC3R and MC4R as an agonist of the endocytosis pathway, despite being an inverse agonist of G protein signaling. AGRP promotes interaction of both MCRs with beta-arrestins (shown by BRET), and beta-arrestin knockdown reduces AGRP-promoted endocytosis. This mechanism reduces MCR cell-surface availability.","method":"BRET assay for beta-arrestin/receptor interaction; siRNA knockdown of beta-arrestins; receptor internalization assays in HEK293 and hypothalamic neuronal cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — BRET, RNAi epistasis, multiple cell types including endogenous MC4R-expressing neurons","pmids":["17041250"],"is_preprint":false},{"year":2010,"finding":"Sirt1 promotes AgRP neuronal activity and connectivity. Pharmacological inhibition of brain Sirt1 decreased AgRP neuronal activity and inhibitory synaptic inputs to POMC neurons. Selective knockout of Sirt1 in AgRP neurons reduced electrophysiological responses to ghrelin, decreased food intake, lean mass, fat mass and body weight. The effect required appropriate mitochondrial redox adaptation via UCP2.","method":"Pharmacological Sirt1 inhibition (EX-527) i.p. and i.c.v.; Cre-Lox conditional knockout of Sirt1 in AgRP neurons; electrophysiology; synaptic quantification","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with electrophysiology, pharmacology, and morphological endpoints","pmids":["20810901"],"is_preprint":false},{"year":2011,"finding":"Chemogenetic (DREADD) activation of AgRP neurons rapidly and dramatically induced feeding, reduced energy expenditure, and increased fat stores; inhibition of AgRP neurons in hungry mice reduced food intake. AgRP neuron activity is both necessary and sufficient for feeding behavior.","method":"DREADD (hM3Dq/hM4Di) chemogenetics in AgRP-Cre mice; food intake, energy expenditure, and body composition measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — bidirectional chemogenetic manipulation with multiple behavioral and metabolic readouts","pmids":["21364278"],"is_preprint":false},{"year":2011,"finding":"GABAergic output from AgRP neurons to the parabrachial nucleus (PBN) is the critical mechanism preventing anorexia after AgRP neuron ablation. Chronic delivery of bretazenil (GABA-A partial agonist) to the PBN restored feeding after AgRP neuron ablation, whereas chronic MC4R antagonism was inadequate, demonstrating that AgRP neurons prevent anorexia primarily via GABA, not AgRP peptide, signaling.","method":"Diphtheria toxin ablation of AgRP neurons; chronic intra-PBN cannula delivery of bretazenil or MC4R antagonist; body weight and feeding measurements","journal":"European journal of pharmacology","confidence":"High","confidence_rationale":"Tier 2 — pharmacological circuit epistasis with defined anatomical targeting","pmids":["21211531"],"is_preprint":false},{"year":2012,"finding":"NMDA receptors (NMDARs) on AgRP neurons are required for fasting-induced activation. Deletion of NMDARs from AgRP neurons reduced body weight, fat, and food intake and abolished fasting-induced increases in c-Fos, Agrp/Npy mRNA, AMPA-mediated EPSCs, and neuronal firing. Fasting increased dendritic spines specifically on AgRP (not POMC) neurons, indicating fasting-induced synaptogenesis dependent on NMDARs.","method":"AgRP- and POMC-specific NMDAR conditional knockout mice; electrophysiology; c-Fos immunohistochemistry; dendritic spine quantification; qPCR","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 — cell-type-specific conditional KO with electrophysiology, morphology, and gene expression readouts","pmids":["22325203"],"is_preprint":false},{"year":2012,"finding":"AgRP neurons are hypophysiotropic in teleosts, projecting directly to the pituitary to regulate multiple pituitary hormones. AgRP-mediated MC4R suppression is essential for early larval growth in teleosts, revealing a fundamental difference in central melanocortin neuroendocrine function between teleosts and mammals.","method":"Larval teleost neuroanatomy; genetic manipulation of MC4R signaling; growth phenotype analysis","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — teleost ortholog, neuroanatomical and genetic evidence, single lab","pmids":["22245570"],"is_preprint":false},{"year":2013,"finding":"AgRP neuron-specific ghrelin receptor (GHSR) re-expression in otherwise GHSR-null mice fully restored the lowering of blood glucose during caloric restriction via glucagon rises and hepatic gluconeogenesis induction, but only partially restored ghrelin-stimulated feeding, demonstrating that GHSR in AgRP neurons is sufficient for ghrelin's glucoregulatory effects but not solely responsible for orexigenic effects.","method":"Tamoxifen-inducible AgRP-CreERT2 transgenic GHSR re-expression in GHSR-null mice; food intake, blood glucose, glucagon, and hepatic gluconeogenesis measurements","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific receptor rescue in null background, multiple metabolic endpoints","pmids":["24567905"],"is_preprint":false},{"year":2016,"finding":"AMPK in AgRP neurons phosphorylates p21-activated kinase (PAK) to drive fasting-induced spinogenesis and increased excitatory synaptic activity. Fasting increases AMPK activity in AgRP neurons; AMPK activity in AgRP neurons is necessary and sufficient for fasting-induced spine formation. PAK is identified as the direct AMPK phosphorylation target mediating this synaptic plasticity.","method":"Neuron-specific AMPK activity measurement and manipulation; AgRP-specific conditional kinase knockdown/activation; dendritic spine quantification; electrophysiology; AMPK substrate identification","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 — cell-type-specific kinase manipulation with substrate identification and morphological/electrophysiological readouts","pmids":["27321921"],"is_preprint":false},{"year":2017,"finding":"Insulin receptor signaling in AgRP neurons controls hepatic glucose production but not adipose tissue lipolysis. AgRP-specific insulin receptor knockout mice showed impaired suppression of hepatic glucose output by insulin, while adipose tissue lipolysis was unaltered, establishing a specific role for insulin signaling in AgRP neurons in glucose (but not lipid) homeostasis.","method":"AgRP-specific insulin receptor knockout mice; hyperinsulinemic-euglycemic clamps; hepatic glucose production measurement; lipolysis assays","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with gold-standard metabolic clamp studies","pmids":["28385803"],"is_preprint":false},{"year":2017,"finding":"FOXO1 in AgRP neurons controls food intake and glucose homeostasis via Gpr17, a G protein-coupled receptor. AgRP neuron-specific Gpr17 knockout mice phenocopied AgRP neuron-specific FOXO1 knockout: reduced food intake, increased energy expenditure, increased satiety, leanness, and increased CNS sensitivity to insulin and leptin.","method":"AgRP-specific Gpr17 conditional knockout mice; food intake, body composition, energy expenditure, glucose tolerance, and insulin sensitivity measurements","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with genetic epistasis to FOXO1, multiple metabolic phenotypes","pmids":["26180086"],"is_preprint":false},{"year":2018,"finding":"Transcription factors Dlx1/2 and Otp coordinately specify AgRP neuron identity: Dlx1/2-deficient mice show loss of GHRH neurons and an increase of AgRP neurons; Dlx1/2 directly binds and represses the Otp gene, and Otp is required for AgRP neuron generation. Thus, the Dlx1/2-Otp axis synchronously specifies and segregates GHRH and AgRP neuronal identities.","method":"Conditional Dlx1/2 knockout mice; Otp knockout mice; chromatin immunoprecipitation for Dlx1/2 binding at Otp locus; cell counting by immunofluorescence; growth and metabolic phenotype analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrating direct binding, conditional KO epistasis, replicated cell counts","pmids":["29795232"],"is_preprint":false},{"year":2019,"finding":"NPY signaling is uniquely required for the long-lasting (sustained) hunger drive produced by AgRP neuron stimulation. Selective deletion of Npy (but not Agrp or GABA signaling) from AgRP neurons abolished optogenetically-stimulated feeding when using brief stimulation paradigms mimicking natural regulation; this was rescued by NPY re-expression specifically in AgRP neurons.","method":"Conditional deletion of Npy, Agrp, or GABA signaling capacity in AgRP neurons; optogenetic stimulation; rescue by Cre-dependent Npy re-expression","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — selective gene deletion with rescue, optogenetics, multiple signal pathway comparisons","pmids":["31033437"],"is_preprint":false},{"year":2019,"finding":"Activation of AgRP neurons rapidly shifts whole-body substrate utilization toward carbohydrate and away from fat oxidation, even without caloric intake. This is coupled to increased lipogenesis, and inhibition of fatty acid synthase blunted these effects. Ablation of AgRP neurons impaired fat mass accumulation, establishing AgRP neurons as regulators of substrate utilization and adiposity.","method":"Chemogenetic activation/ablation of AgRP neurons; indirect calorimetry (respiratory quotient); fatty acid synthase inhibitor pharmacology; pair-feeding experiments; body composition analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — bidirectional manipulation with pharmacological epistasis and metabolic readouts","pmids":["30659173"],"is_preprint":false},{"year":2019,"finding":"DNA methylation by Dnmt3a in AgRP neurons is required for normal epigenetic development and neuron-specific gene expression. Dnmt3a deletion in AgRP neurons caused a sedentary phenotype with reduced voluntary exercise and increased adiposity. Whole-genome bisulfite sequencing revealed promoter hypomethylation and increased expression of Bmp7 in AgRP neurons, implicating aberrant TGF-β signaling.","method":"AgRP-specific Dnmt3a conditional knockout; whole-genome bisulfite sequencing; transcriptional profiling; voluntary wheel running measurement; body composition","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with genome-wide methylation profiling and phenotypic characterization","pmids":["31792207"],"is_preprint":false},{"year":2020,"finding":"Central α-klotho suppresses NPY/AgRP neuron activity via FGFR1/PI3K signaling. ICV α-klotho enhanced inhibitory postsynaptic currents onto AgRP neurons (patch clamp), induced phosphorylation of AKT, ERK, and FOXO1, and blunted AgRP gene transcription. FGFR1 inhibition abolished all downstream effects of α-klotho on AgRP neurons.","method":"ICV α-klotho administration; ex vivo patch clamp electrophysiology; immunohistochemistry; phosphorylation assays in GT1-7 hypothalamic cells; FGFR1/PI3K inhibitor pharmacology; glucose tolerance and body weight measurements","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology plus signaling assays and pharmacological epistasis, single lab","pmids":["32332158"],"is_preprint":false},{"year":2021,"finding":"AgRP neurons triggered a feed-forward astrocyte-mediated auto-excitatory loop: activated AgRP neurons release GABA, which evokes mitochondrial adaptations in neighboring astrocytes and increased glial ensheathing of AgRP perikarya. Astrocytes then produce prostaglandin E2 (PGE2), which directly activates AgRP neurons via EP2 receptors, amplifying their own excitability.","method":"Chemogenetic and food deprivation/ghrelin activation of AgRP neurons; astrocyte mitochondrial imaging; GABA manipulation; PGE2 measurement; EP2 receptor pharmacology; microglial/astrocyte morphological analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple experimental approaches identifying a novel glia-neuron feed-forward circuit","pmids":["33848272"],"is_preprint":false},{"year":2021,"finding":"A subgroup of AgRP neurons projecting non-collaterally to MC4R-expressing neurons in the dorsal lateral dorsal raphe nucleus (dlDRN) controls energy expenditure independently of feeding. MC4R-dlDRN neurons integrate presynaptic AgRP signaling to modulate downstream serotonergic neurons, and this circuit bidirectionally regulates body weight through sympathetic outflow reprogramming mitochondrial bioenergetics in brown and beige fat.","method":"Circuit-specific genetic manipulation; fiber photometry; electrophysiology; optogenetics; MC4R-dlDRN conditional knockouts; BAT metabolic assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multi-modal circuit dissection with multiple orthogonal methods","pmids":["34112797"],"is_preprint":false},{"year":2021,"finding":"Cold-responsive neurons in the medial preoptic area (mPOA) make excitatory synapses onto ARCAgRP neurons. Inhibition of either ARCAgRP neurons or ARC-projecting mPOA neurons attenuated cold-evoked feeding, while activation of the mPOA-to-ARC projection increased food intake, identifying an mPOA→AgRP circuit for cold-evoked feeding.","method":"In vivo calcium imaging; optogenetics; circuit tracing; chemogenetics; cold exposure experiments with food intake measurement","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional circuit manipulation with calcium imaging, single lab","pmids":["34380037"],"is_preprint":false},{"year":2022,"finding":"TET3 controls feeding and stress responses in AgRP neurons by regulating DNA demethylation at the Agrp promoter in response to leptin. CRISPR-mediated Tet3 ablation in AgRP neurons caused hyperphagia, obesity, and diabetes with upregulation of Agrp, Npy, and Slc32a1 (vesicular GABA transporter). Leptin dynamically recruits TET3 to the Agrp promoter to produce 5-hydroxymethylcytosine, recruiting a chromatin-modifying complex for transcription inhibition.","method":"CRISPR Tet3 knockout in AgRP neurons; ChIP for TET3 at Agrp promoter; 5hmC modification assay; chromatin complex analysis; food intake, body weight, glucose tolerance, and behavior measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrating dynamic TET3 recruitment at Agrp promoter with 5hmC modification, combined with in vivo CRISPR KO phenotype","pmids":["36189793"],"is_preprint":false},{"year":2022,"finding":"NPY released from AGRP neurons controls feeding via Y1 receptors and controls energy expenditure and locomotion via Y2 receptors. Conditional knockout of Npy only in AGRP neurons increased feeding and raised respiratory quotient (rescued by Y1R agonist), while reducing energy expenditure and locomotion (rescued by Y2R agonist), dissecting the pathway-specific functions of NPY from AGRP neurons.","method":"Conditional Agrp-cre;Npy-lox knockout mice; DREADD chemogenetics; selective Y1R/Y2R agonist rescue experiments; metabolic phenotyping","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 — receptor subtype-selective rescue experiments with conditional KO; multiple metabolic endpoints","pmids":["35167990"],"is_preprint":false},{"year":2022,"finding":"Food-evoked dopamine release in the arcuate nucleus acts via dopamine receptor D1 (Drd1) expressed on AgRP/NPY neurons to promote feeding. High-fat diet delivery after food deprivation acutely induced dopamine release in the ARC; AgRP-specific Drd1 knockout mice showed attenuated foraging and refeeding of HFD, positioning Drd1 signaling in AgRP neurons as integrator of hedonic and homeostatic feeding circuits.","method":"In vivo dopamine measurement in ARC; AgRP-specific Drd1 conditional knockout; chemogenetic stimulation of Drd1/AgRP co-expressing neurons; foraging and feeding behavior tests","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with in vivo neurochemical measurement, single lab","pmids":["36450244"],"is_preprint":false},{"year":2022,"finding":"Lipid biosynthesis enzyme Agpat5 in AgRP neurons is required for hypoglycemia sensing and glucagon secretion. Agpat5 inactivation in AgRP neurons led to increased fatty acid oxidation and ATP production, impairing the fall in intracellular ATP that normally triggers neuronal firing in response to low glucose. Suppressing Cpt1a-dependent mitochondrial fatty acid import restored hypoglycemia sensing.","method":"AgRP-specific Agpat5 conditional knockout mice; vagal nerve activity recording; glucagon secretion measurement; metabolic flux assays; Cpt1a inhibitor pharmacological rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with metabolic rescue demonstrating the enzymatic mechanism","pmids":["36180454"],"is_preprint":false},{"year":2023,"finding":"CaMK1D in AgRP neurons mediates ghrelin-dependent food intake via phosphorylation of CREB and CREB-dependent expression of AgRP/NPY neuropeptides in projections to the PVN. Global or AgRP-specific Camk1d knockout mice are resistant to ghrelin, gain less weight, and are protected against HFD-induced obesity.","method":"Global and AgRP-specific Camk1d conditional knockout mice; ghrelin challenge; CREB phosphorylation assays; AgRP/NPY neuropeptide quantification in PVN projections; HFD feeding experiments","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with signaling mechanism (CREB phosphorylation) and neuropeptide expression readout in projection targets","pmids":["37277610"],"is_preprint":false},{"year":2023,"finding":"MC3R expression within AgRP neurons is required for normal fasting-, cold-, and ghrelin-induced activation of AgRP neurons. MC3R knockout mice and conditional AgRP-specific MC3R knockout mice show defective AgRP neuron activation under energy deficit, while food-induced inhibition of AgRP neurons remains normal.","method":"MC3R global and AgRP-specific conditional knockout mice; c-Fos induction after fasting, cold, and ghrelin; calcium imaging","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with multiple activating stimuli tested","pmids":["37792535"],"is_preprint":false},{"year":2023,"finding":"AgRP neurons relay control of liver autophagy during energy deprivation via NPY release in the PVH: NPY inhibits NPY1R-expressing PVH neurons, disinhibiting PVHCRH neurons that raise circulating corticosterone, which activates hepatic glucocorticoid receptors to induce autophagy and ketogenesis. Optogenetic/chemogenetic AgRP neuron activation induces hepatic autophagy and phosphorylation of autophagy regulators; inhibiting AgRP neurons during fasting abrogates hepatic autophagy.","method":"Optogenetics and chemogenetics; AgRP neuron-specific ablation; NPY1R pharmacology; corticosterone measurement; hepatic glucocorticoid receptor knockdown; autophagy and phosphorylation assays","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — bidirectional circuit manipulation with mechanistic pathway dissection across multiple tissues","pmids":["37075752"],"is_preprint":false},{"year":2023,"finding":"Asprosin activates AgRP neurons via binding to Ptprd (protein tyrosine phosphatase receptor δ), which reduces SK3 channel (small-conductance calcium-activated K+ channel) current in AgRP neurons. AgRP-specific SK3 deletion blocked asprosin-induced AgRP activation and overeating; Ptprd deletion or knockdown abolished asprosin's effects on SK current and neuronal activity, identifying an asprosin-Ptprd-SK3 intracellular mechanism.","method":"AgRP-specific SK3 conditional knockout; electrophysiology (SK current measurements); Ptprd genetic manipulation; asprosin deficiency models; chemogenetic and pharmacological approaches","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO combined with electrophysiological channel current measurements and receptor-specific epistasis","pmids":["36812308"],"is_preprint":false},{"year":2024,"finding":"miR-33 regulates AgRP neuron activity and hunger. Loss of miR-33 increases feeding and causes obesity through dysregulation of multiple miR-33 target genes involved in mitochondrial biogenesis and fatty acid metabolism in AgRP neurons.","method":"Conditional miR-33 knockout mice with AgRP neuron specificity; transcriptional profiling; metabolic phenotyping; miR-33 target gene analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with target gene identification, single lab","pmids":["38459068"],"is_preprint":false},{"year":2024,"finding":"Iron overload in AgRP neurons mediated by transferrin receptor 1 (Tfrc) promotes AgRP neuron hyperactivity, overeating, and adiposity via iron-induced oxidative stress, ER stress, NFκB signaling, and SOCS3 upregulation that impairs insulin and leptin sensitivity. Central deferoxamine or AgRP-specific Tfrc deletion reduced AgRP neuron activity and ameliorated diet-induced obesity.","method":"AgRP-specific Tfrc conditional knockout; central deferoxamine pharmacology; electrophysiology; oxidative stress and ER stress markers; insulin/leptin sensitivity assays; body composition measurement","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with mechanistic pathway analysis and pharmacological rescue, single lab","pmids":["38460132"],"is_preprint":false}],"current_model":"AGRP is a hypothalamic neuropeptide with an inhibitor cystine knot (ICK) fold in its C-terminal domain that acts as a potent inverse agonist/antagonist at melanocortin MC3R and MC4R (binding via exoloops 2/3 of the receptor and requiring D90-TM2 and D298-TM7), co-released with NPY and GABA from arcuate nucleus neurons; it also promotes beta-arrestin-mediated MC3R/MC4R endocytosis, and its neuronal activity is regulated by multiple upstream signals (leptin via FoxO1-Stat3 transcriptional squelching and TET3-mediated 5hmC modification at the Agrp promoter; ghrelin via GHSR-CaMK1D-CREB; AMPK-PAK fasting-induced spinogenesis; insulin via insulin receptor-FOXO1-Gpr17; iron via Tfrc-oxidative stress; asprosin via Ptprd-SK3 channels; MC3R autocrine feedback), and AgRP neuron activation drives feeding (sustained by NPY via Y1R), shifts substrate utilization toward lipogenesis (via fatty acid synthase), controls energy expenditure via a dorsal raphe MC4R-serotonin circuit, regulates hepatic autophagy via NPY-PVH-corticosterone signaling, and controls blood glucose via glucagon secretion requiring GHSR and Agpat5-dependent ATP sensing."},"narrative":{"teleology":[{"year":1997,"claim":"The identification of AGRP as an arcuate-restricted melanocortin receptor antagonist whose overexpression causes obesity established the gene as the hypothalamic counterpart of agouti signaling protein and a key mediator of leptin-regulated body weight.","evidence":"Recombinant protein pharmacology at MC3R/MC4R; transgenic overexpression in mice; in situ hybridization showing arcuate-specific expression elevated in ob/ob and db/db mice","pmids":["9311920","9119224","9354787"],"confidence":"High","gaps":["Endogenous loss-of-function phenotype not yet tested","Mechanism of selectivity for MC3R/MC4R over MC1R/MC2R unknown"]},{"year":1999,"claim":"Determination of the disulfide connectivity, NMR structure, and minimal active domain revealed that AGRP's C-terminal cystine knot fold—the first mammalian ICK protein—presents an Arg-Phe-Phe pharmacophore that engages MC4R extracellular loops 2 and 3, explaining receptor subtype selectivity.","evidence":"Biochemical disulfide mapping; NMR structures of AGRP(87-132) and minimized 34-residue domain; chimeric MC4R/MC1R binding assays; synthetic mutagenesis","pmids":["9724530","10371151","9892020","10318826","11747427","12056887"],"confidence":"High","gaps":["No high-resolution AGRP–MC4R co-structure","Role of the N-terminal pro-region in processing or signaling unclear"]},{"year":2001,"claim":"Demonstration that ghrelin activates arcuate NPY/AGRP neurons, and that antibody/antagonist blockade of AGRP abolishes ghrelin-induced feeding, placed AGRP downstream of the ghrelin–GHSR axis and upstream of MC4R in the orexigenic circuit.","evidence":"ICV ghrelin injection with Fos immunohistochemistry; antibody and antagonist blockade of NPY and AGRP in rats","pmids":["11196643"],"confidence":"High","gaps":["Intracellular signaling cascade from GHSR to Agrp transcription not resolved","Relative contributions of AGRP vs NPY vs GABA not dissected"]},{"year":2006,"claim":"The discovery that AGRP is an inverse agonist (suppressing MC4R constitutive activity) and simultaneously an agonist of β-arrestin-mediated MC3R/MC4R endocytosis revealed dual mechanisms—active silencing and receptor removal—by which AGRP inhibits melanocortin signaling.","evidence":"Chimeric MC4R/MC1R mutagenesis with cAMP below-baseline readout; BRET for β-arrestin interaction; siRNA knockdown of β-arrestins with internalization assays","pmids":["16820227","17041250"],"confidence":"High","gaps":["In vivo contribution of endocytosis vs inverse agonism not separated","Kinetics of receptor recycling after AGRP-driven internalization unknown"]},{"year":2006,"claim":"Identification of FoxO1–Stat3 transcriptional opposition at the Agrp promoter provided the first molecular mechanism linking leptin receptor signaling to Agrp gene suppression, explaining how metabolic hormones regulate neuropeptide output at the transcriptional level.","evidence":"Adenoviral FoxO1 mutant delivery to arcuate nucleus; ChIP; promoter-reporter assays; in vivo food intake and gene expression","pmids":["16604086"],"confidence":"High","gaps":["Chromatin remodeling cofactors at the Agrp locus incompletely characterized","How insulin signaling intersects FoxO1 at the Agrp promoter not fully resolved"]},{"year":2011,"claim":"Bidirectional chemogenetic manipulation proved that AgRP neuron activity is both necessary and sufficient for feeding, while circuit-specific ablation/rescue experiments identified GABAergic output to the parabrachial nucleus—not AGRP peptide—as the signal preventing acute starvation.","evidence":"DREADD activation/inhibition in AgRP-Cre mice; diphtheria toxin ablation with chronic intra-PBN bretazenil rescue; MC4R antagonist inefficacy","pmids":["21364278","21211531"],"confidence":"High","gaps":["Temporal dynamics distinguishing GABA fast effects from AGRP peptide slow effects not fully delineated"]},{"year":2016,"claim":"Discovery that fasting activates AMPK in AgRP neurons, which phosphorylates PAK to drive spinogenesis, explained how metabolic state is translated into synaptic remodeling that increases excitatory input onto AgRP neurons.","evidence":"AgRP-specific AMPK manipulation; dendritic spine quantification; electrophysiology; AMPK substrate identification","pmids":["27321921"],"confidence":"High","gaps":["Whether PAK is the sole AMPK substrate for synaptogenesis not ruled out","Presynaptic identity of new excitatory inputs not defined"]},{"year":2019,"claim":"Selective deletion of Npy (but not Agrp or GABA machinery) from AgRP neurons abolished sustained optogenetically-evoked feeding, establishing NPY—acting via Y1R for feeding and Y2R for energy expenditure—as the neuropeptide sustaining the long-lasting hunger drive.","evidence":"Conditional deletion of Npy, Agrp, or GABA capacity in AgRP neurons; optogenetic stimulation; Y1R/Y2R agonist rescue","pmids":["31033437","35167990"],"confidence":"High","gaps":["Whether AGRP peptide functions on longer timescales (days) not excluded","Circuit targets mediating Y2R energy expenditure effects incompletely mapped"]},{"year":2019,"claim":"Chemogenetic activation showed AgRP neurons rapidly shift whole-body substrate utilization toward carbohydrate oxidation and lipogenesis via fatty acid synthase, expanding their role beyond feeding to direct metabolic partitioning.","evidence":"Chemogenetic activation/ablation; indirect calorimetry; fatty acid synthase inhibitor pharmacology; pair-feeding","pmids":["30659173"],"confidence":"High","gaps":["Downstream neural pathways from AgRP neurons to peripheral lipogenic programs not traced","Whether this is mediated by AGRP, NPY, or GABA not dissected"]},{"year":2022,"claim":"TET3 was shown to dynamically produce 5-hydroxymethylcytosine at the Agrp promoter in response to leptin, recruiting a chromatin-modifying complex that represses Agrp transcription, providing a second epigenetic mechanism (complementing FoxO1-Stat3) for hormonal control of neuropeptide expression.","evidence":"CRISPR Tet3 KO in AgRP neurons; ChIP for TET3; 5hmC assay; chromatin complex analysis; metabolic phenotyping","pmids":["36189793"],"confidence":"High","gaps":["Identity of the recruited chromatin-modifying complex incompletely defined","Relationship between TET3 and FoxO1 pathways not integrated"]},{"year":2022,"claim":"Agpat5 in AgRP neurons was identified as the lipid-metabolic sensor linking hypoglycemia to glucagon secretion: its inactivation increased fatty acid oxidation and ATP, preventing the ATP decline that normally triggers neuronal firing, and Cpt1a inhibition rescued this defect.","evidence":"AgRP-specific Agpat5 conditional KO; vagal nerve recording; glucagon measurement; metabolic flux; Cpt1a inhibitor rescue","pmids":["36180454"],"confidence":"High","gaps":["Whether Agpat5 directly senses glucose or lipid flux not resolved","Downstream autonomic pathways to pancreatic alpha cells not fully mapped"]},{"year":2023,"claim":"Multiple upstream activating pathways converging on AgRP neurons were mechanistically dissected: ghrelin signals through CaMK1D–CREB to drive AgRP/NPY expression in PVN projections, MC3R autocrine signaling is required for fasting/cold/ghrelin activation, asprosin acts via Ptprd to suppress SK3 K+ channels, and AgRP-to-PVH NPY controls hepatic autophagy through corticosterone.","evidence":"AgRP-specific conditional KOs of Camk1d, MC3R, SK3, and Ptprd; optogenetic/chemogenetic circuit manipulation; electrophysiology; hepatic autophagy assays","pmids":["37277610","37792535","36812308","37075752"],"confidence":"High","gaps":["How these parallel input pathways are integrated within single AgRP neurons is unknown","Whether MC3R autocrine feedback involves AGRP peptide or other melanocortins not clarified"]},{"year":2024,"claim":"Iron-sensing via Tfrc and miR-33-dependent mitochondrial/fatty acid metabolism were identified as additional modulators of AgRP neuron activity and body weight, broadening the metabolic signals converging on these neurons.","evidence":"AgRP-specific Tfrc and miR-33 conditional KOs; electrophysiology; oxidative/ER stress markers; transcriptional profiling","pmids":["38459068","38460132"],"confidence":"Medium","gaps":["Physiological conditions under which iron or miR-33 become rate-limiting for AgRP activity not established","Both findings from single labs"]},{"year":null,"claim":"A high-resolution structure of the AGRP–MC4R complex remains unavailable, and how the multiple upstream signaling inputs (leptin, ghrelin, insulin, asprosin, iron, dopamine) are integrated at the single-neuron level to produce graded orexigenic output is unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No cryo-EM or crystal structure of AGRP bound to MC4R","Single-cell integration logic of parallel metabolic inputs unknown","In vivo contribution of AGRP inverse agonism vs β-arrestin-mediated endocytosis not separated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,2,4,15]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[15,16]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,2,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,5,15,16]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[18,19,20,32]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[28,37]}],"complexes":[],"partners":["MC4R","MC3R","NPY","ARRB1","ARRB2","FOXO1","GHSR","CAMK1D"],"other_free_text":[]},"mechanistic_narrative":"AGRP is a hypothalamic neuropeptide released from arcuate nucleus neurons that functions as a potent inverse agonist and antagonist of melanocortin receptors MC3R and MC4R, serving as a central orexigenic signal that drives feeding, modulates energy expenditure, and regulates glucose homeostasis [PMID:9311920, PMID:16820227, PMID:21364278]. Its C-terminal inhibitor cystine knot (ICK) domain—the first identified in a mammalian protein—is sufficient for receptor binding, with the Arg-Phe-Phe triplet engaging MC4R extracellular loops 2/3, while AGRP additionally promotes β-arrestin-mediated MC3R/MC4R endocytosis to reduce cell-surface receptor availability [PMID:11747427, PMID:10318826, PMID:17041250]. AgRP neuron activity is regulated by converging metabolic signals—leptin suppresses Agrp transcription via FoxO1–Stat3 opposition and TET3-mediated 5-hydroxymethylcytosine deposition at the Agrp promoter, ghrelin activates expression via GHSR–CaMK1D–CREB signaling, and fasting drives AMPK–PAK-dependent spinogenesis that increases excitatory synaptic input [PMID:16604086, PMID:36189793, PMID:37277610, PMID:27321921]. Beyond feeding, AgRP neurons control energy expenditure via a dorsal raphe MC4R–serotonin circuit, hepatic autophagy via an NPY–PVH–corticosterone axis, and counter-regulatory glucagon secretion through Agpat5-dependent glucose sensing [PMID:34112797, PMID:37075752, PMID:36180454]."},"prefetch_data":{"uniprot":{"accession":"O00253","full_name":"Agouti-related protein","aliases":[],"length_aa":132,"mass_kda":14.4,"function":"Signaling protein that functions as an antagonist of melanocyte-stimulating-hormone receptors MC3R and MC4R by precluding agonist-induced signaling, thereby inhibiting cAMP production within the hypothalamus and adrenal gland (PubMed:10371151, PubMed:11145747, PubMed:9311920, PubMed:9892020). Involved in the control of feeding behavior via the central melanocortin system (PubMed:15927146, PubMed:9311920). Has very low activity towards MC5R (PubMed:9311920, PubMed:9892020). Also promotes endocytosis of MC3R and MC4R in an arrestin-dependent mechanism (PubMed:17041250)","subcellular_location":"Secreted; Golgi apparatus lumen","url":"https://www.uniprot.org/uniprotkb/O00253/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AGRP","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AGRP","total_profiled":1310},"omim":[{"mim_id":"619939","title":"OLFACTORY RECEPTOR, FAMILY 4, SUBFAMILY M, MEMBER 1; OR4M1","url":"https://www.omim.org/entry/619939"},{"mim_id":"616914","title":"MARFANOID-PROGEROID-LIPODYSTROPHY SYNDROME; MFLS","url":"https://www.omim.org/entry/616914"},{"mim_id":"614911","title":"C1q- AND TUMOR NECROSIS FACTOR-RELATED PROTEIN 4; C1QTNF4","url":"https://www.omim.org/entry/614911"},{"mim_id":"613879","title":"THYROTROPIN-RELEASING HORMONE; TRH","url":"https://www.omim.org/entry/613879"},{"mim_id":"611074","title":"BRAIN-SPECIFIC HOMEOBOX; BSX","url":"https://www.omim.org/entry/611074"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"adrenal gland","ntpm":19.9},{"tissue":"brain","ntpm":36.4},{"tissue":"epididymis","ntpm":35.0}],"url":"https://www.proteinatlas.org/search/AGRP"},"hgnc":{"alias_symbol":["Agrt","ART","ASIP2"],"prev_symbol":[]},"alphafold":{"accession":"O00253","domains":[{"cath_id":"4.10.760.10","chopping":"86-132","consensus_level":"medium","plddt":84.4372,"start":86,"end":132}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00253","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00253-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00253-F1-predicted_aligned_error_v6.png","plddt_mean":69.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AGRP","jax_strain_url":"https://www.jax.org/strain/search?query=AGRP"},"sequence":{"accession":"O00253","fasta_url":"https://rest.uniprot.org/uniprotkb/O00253.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00253/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00253"}},"corpus_meta":[{"pmid":"21364278","id":"PMC_21364278","title":"Rapid, 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(2005)","url":"https://pubmed.ncbi.nlm.nih.gov/23900445","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12213871","id":"PMC_12213871","title":"A polymorphism in the human agouti-related protein is associated with late-onset obesity.","date":"2002","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/12213871","citation_count":66,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17041250","id":"PMC_17041250","title":"The natural inverse agonist agouti-related protein induces arrestin-mediated endocytosis of melanocortin-3 and -4 receptors.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17041250","citation_count":65,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19058789","id":"PMC_19058789","title":"A common variant in DRD3 receptor is associated with autism spectrum disorder.","date":"2008","source":"Biological psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/19058789","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20468064","id":"PMC_20468064","title":"Association study of 182 candidate genes in anorexia nervosa.","date":"2010","source":"American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20468064","citation_count":62,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10366820","id":"PMC_10366820","title":"The role of agouti-related protein in regulating body weight.","date":"1999","source":"Molecular medicine today","url":"https://pubmed.ncbi.nlm.nih.gov/10366820","citation_count":61,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15546902","id":"PMC_15546902","title":"Circulating melanin-concentrating hormone, agouti-related protein, and alpha-melanocyte-stimulating hormone levels in relation to body composition: alterations in response to food deprivation and recombinant human leptin administration.","date":"2004","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/15546902","citation_count":54,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10318826","id":"PMC_10318826","title":"Contribution of melanocortin receptor exoloops to Agouti-related protein binding.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10318826","citation_count":53,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":40754,"output_tokens":9131,"usd":0.129613},"stage2":{"model":"claude-opus-4-6","input_tokens":12993,"output_tokens":4668,"usd":0.272498},"total_usd":0.809478,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":54933,"output_tokens":10669,"usd":0.162417},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":14750,"output_tokens":3582,"usd":0.24495}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"Acute chemogenetic activation of AgRP neurons (via DREADD technology) rapidly and dramatically induces feeding, reduces energy expenditure, and increases fat stores, while inhibiting AgRP neuronal activity in hungry mice reduces food intake, demonstrating that AgRP neuron activity is both necessary and sufficient for feeding.\",\n      \"method\": \"DREADD-based chemogenetic activation/inhibition in mice with phenotypic readout of food intake, energy expenditure, and fat stores\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation (activation and inhibition) with defined cellular and behavioral phenotypes, replicated across conditions\",\n      \"pmids\": [\"21364278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FoxO1 transcription factor mediates leptin's regulation of Agrp expression in the arcuate nucleus; constitutively nuclear FoxO1 abolishes leptin's suppression of Agrp, while a transactivation-deficient FoxO1 prevents fasting-induced Agrp induction. FoxO1 and Stat3 exert opposing actions on Agrp and Pomc promoters through transcriptional squelching, with FoxO1 promoting coactivator-corepressor exchange that activates Agrp and inhibits Pomc.\",\n      \"method\": \"Adenoviral delivery of FoxO1 mutants to hypothalamic arcuate nucleus; promoter coactivator/corepressor exchange assays; mRNA expression analysis\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (viral gene delivery, transcriptional assays, epistasis) in a single study\",\n      \"pmids\": [\"16604086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NMDA receptors on AgRP neurons are required for fasting-induced activation of AgRP neurons (as measured by c-Fos, Agrp and Npy mRNA expression, AMPA receptor-mediated EPSCs, depolarization, and firing rates). Fasting increases dendritic spines on AgRP neurons and glutamatergic input, suggesting fasting-induced synaptogenesis and spinogenesis, and deletion of NMDARs from AgRP neurons markedly reduces weight, body fat, and food intake.\",\n      \"method\": \"Conditional knockout of NMDARs in AgRP or POMC neurons; electrophysiology (patch-clamp, EPSCs); c-Fos immunostaining; spine counting\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic KO with multiple orthogonal electrophysiological and molecular readouts\",\n      \"pmids\": [\"22325203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ghrelin receptor (GHSR)-containing AgRP neurons are sufficient to mediate ghrelin's glucoregulatory effects (normalizing blood glucose via glucagon rises and hepatic gluconeogenesis induction during caloric restriction) but are not solely responsible for ghrelin's orexigenic effects.\",\n      \"method\": \"Tamoxifen-inducible AgRP-CreER(T2) transgenic mouse model with spatiotemporally-controlled re-expression of GHSRs specifically in AgRP neurons of GHSR-null mice; glucose measurements; glucagon assays\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific receptor re-expression rescue experiment with defined physiological phenotypes\",\n      \"pmids\": [\"24567905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sirt1 promotes activity and synaptic connectivity of AgRP neurons; pharmacological inhibition of brain Sirt1 decreases AgRP neuronal activity and inhibitory tone on POMC neurons. Selective knockout of Sirt1 in AgRP neurons decreases electrical responses to ghrelin and decreases food intake, lean mass, fat mass, and body weight. Sirt1's action requires mitochondrial UCP2-dependent redox adaptation.\",\n      \"method\": \"Sirt1 inhibitor (EX-527) administration (i.p. and i.c.v.); Cre-Lox knockout of Sirt1 in AgRP neurons; electrophysiology; synaptic input counting; food intake measurement\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic (conditional KO) approaches with electrophysiological and behavioral readouts\",\n      \"pmids\": [\"20810901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NPY (neuropeptide Y) co-released by AgRP neurons is uniquely required for the long-lasting effects of AgRP neuron stimulation on feeding behavior. Deletion of NPY (but not AgRP peptide or GABA) from AgRP neurons abolishes optically-stimulated feeding, and this is rescued by NPY re-expression selectively in AgRP neurons.\",\n      \"method\": \"Optogenetic stimulation of AgRP neurons; conditional deletion of AgRP, NPY, or GABA signaling from AgRP neurons using Cre-lox; rescue experiments with NPY re-expression\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic dissection with deletion and rescue of individual signaling molecules, multiple orthogonal methods\",\n      \"pmids\": [\"31033437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GABAergic output from AgRP neurons to the parabrachial nucleus (PBN) is essential for preventing anorexia; chronic delivery of a GABA-A receptor partial agonist into the PBN restores feeding and body weight when AgRP neurons are acutely ablated, whereas chronic blockade of MC4R signaling is inadequate.\",\n      \"method\": \"Diphtheria toxin ablation of AgRP neurons; chronic intracranial drug delivery to PBN; pharmacological rescue experiments\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic ablation with pharmacological rescue identifying specific downstream GABAergic circuit\",\n      \"pmids\": [\"21211531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Fasting increases AMPK activity specifically within AgRP neurons, and increased AMPK activity in AgRP neurons is both necessary and sufficient for fasting-induced spinogenesis and excitatory synaptic activity. The AMPK phosphorylation target mediating this plasticity is p21-activated kinase (PAK).\",\n      \"method\": \"Neuron-specific kinase activity measurement and manipulation; conditional AMPK activation/inhibition in AgRP neurons; spine counting; electrophysiology\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — bidirectional manipulation of AMPK in AgRP neurons with identification of downstream substrate PAK and multiple readouts\",\n      \"pmids\": [\"27321921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Activation of hypothalamic Agrp neurons rapidly alters whole-body substrate utilization, increasing carbohydrate utilization and decreasing fat utilization independently of caloric ingestion. This is coupled to increased lipogenesis, and inhibition of fatty acid synthase blunts these effects. Ablation of Agrp neurons impairs fat mass accumulation.\",\n      \"method\": \"Chemogenetic activation/ablation of Agrp neurons; indirect calorimetry; pharmacological inhibition of fatty acid synthase; pair-feeding experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation with multiple metabolic readouts and pharmacological dissection\",\n      \"pmids\": [\"30659173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TXNIP in Agrp neurons regulates energy expenditure, adiposity, and central leptin sensitivity without affecting food intake. Overexpression of TXNIP in Agrp neurons decreases energy expenditure and increases adiposity; deletion protects against diet-induced obesity and improves fasting glucose levels. Bidirectional TXNIP manipulation induces reciprocal changes in central leptin sensitivity and the neural regulation of lipolysis.\",\n      \"method\": \"Agrp-specific TXNIP gain-of-function and loss-of-function mouse models using Cre-lox; metabolic phenotyping; leptin sensitivity testing\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic manipulation in cell-type-specific models with defined metabolic phenotypes\",\n      \"pmids\": [\"22815502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Fasting activates AgRP neurons, which induce liver autophagy and ketogenesis via NPY release in the paraventricular nucleus (PVH), presynaptic inhibition of NPY1R-expressing neurons, and activation of PVH-CRH neurons. AgRP neuron activation increases circulating corticosterone, and reduction of hepatic glucocorticoid receptor expression attenuates AgRP neuron-dependent hepatic autophagy.\",\n      \"method\": \"Optogenetic and chemogenetic activation of AgRP neurons; phosphorylation analysis of autophagy regulators; conditional knockouts; hormone measurements\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple circuit-level manipulations with circuit tracing and defined molecular mechanism\",\n      \"pmids\": [\"37075752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AgRP neurons activated by food deprivation, ghrelin, or chemogenetics release GABA, which triggers mitochondrial adaptations in neighboring astrocytes, leading to increased glial ensheatment of AgRP perikarya and increased AgRP neuron excitability. Astrocytes produce prostaglandin E2 in response, which directly activates AgRP neurons via EP2 receptors, creating a feed-forward autoactivation loop.\",\n      \"method\": \"Chemogenetics; electron microscopy of glial ensheatment; astrocyte-specific manipulations; pharmacological EP2 receptor studies; in vitro and in vivo experiments\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods identifying a novel astrocyte-AgRP feed-forward circuit with defined molecular mediators\",\n      \"pmids\": [\"33848272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A subgroup of AgRP neurons sending non-collateral projections to MC4R-expressing neurons in the dorsal lateral dorsal raphe nucleus (dlDRN), which in turn innervate serotonergic neurons, bi-directionally regulates energy expenditure without affecting food intake. MC4R-dlDRN signaling reprograms mitochondrial bioenergetics in brown and beige fat via sympathetic outflow.\",\n      \"method\": \"Circuit-specific genetic manipulations; fiber photometry; electrophysiology; thermogenic gene expression; sympathetic nerve activity measurement\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — circuit dissection with genetic manipulation, electrophysiology, and defined peripheral metabolic readouts\",\n      \"pmids\": [\"34112797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AGRP functions as an inverse agonist at MC4R, reducing basal cAMP production. The N-terminus and distal C-terminus of MC4R are required for AGRP inverse agonism. Residues D90 in TM2 and D298 in TM7 of MC4R are critical for both NDP-MSH-mediated receptor activation and AGRP-mediated inverse agonism.\",\n      \"method\": \"Chimeric receptor analysis; site-directed mutagenesis of MC4R; cAMP assays in transfected cells\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro mutagenesis with functional cAMP readout identifying specific receptor residues\",\n      \"pmids\": [\"16820227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Leptin and insulin both decrease AGRP peptide release from perifused rat hypothalamic slices (primarily after depolarization), while fasting decreases the ratio of gamma3-MSH to AGRP released, consistent with net inhibition of hypothalamic melanocortin receptor signaling during energy deprivation.\",\n      \"method\": \"Perifused rat hypothalamic slice preparation; AGRP and gamma3-MSH peptide release assays; KCl depolarization\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vitro peptide release assay but single lab, no genetic manipulation\",\n      \"pmids\": [\"15680952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RNA interference reducing hypothalamic AGRP mRNA by ~50% increases metabolic rate and reduces body weight without changes in food intake, demonstrating that AGRP can function to increase body weight and reduce metabolic rate independently of effects on food intake.\",\n      \"method\": \"In vivo RNAi to reduce hypothalamic AGRP mRNA; metabolic rate measurement; body weight measurement; food intake measurement\",\n      \"journal\": \"BMC neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gene knockdown with defined metabolic phenotypes; single lab\",\n      \"pmids\": [\"12423556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Insulin receptor signaling specifically in AgRP neurons is required for insulin-mediated suppression of hepatic glucose production, but not for suppression of adipose tissue lipolysis. Mice lacking the insulin receptor in AgRP neurons show impaired hepatic insulin action.\",\n      \"method\": \"AgRP neuron-specific insulin receptor knockout mice; hyperinsulinemic-euglycemic clamps; hepatic glucose production measurements\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with defined physiological phenotype using gold-standard metabolic technique (clamp)\",\n      \"pmids\": [\"28385803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Gpr17 is an effector of FOXO1 orexigenic signals in AgRP neurons; AgRP neuron-specific Gpr17 knockout mice show reduced food intake, increased energy expenditure, increased satiety, leanness, and increased CNS sensitivity to insulin and leptin, phenocopying FOXO1 knockout in AgRP neurons.\",\n      \"method\": \"AgRP neuron-specific Gpr17 knockout mice (Agrp-Gpr17-/-); metabolic phenotyping; insulin/leptin sensitivity tests\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with defined phenotypes; single lab\",\n      \"pmids\": [\"26180086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Deletion of DNA methyltransferase Dnmt3a in hypothalamic AgRP neurons causes a sedentary phenotype with reduced voluntary exercise and increased adiposity. WGBS and transcriptional profiling reveal differentially methylated regions and reduced AgRP neuron-associated gene expression, with promoter hypomethylation and increased expression of Bmp7 in AgRP neurons, implicating aberrant TGF-β signaling.\",\n      \"method\": \"Conditional Dnmt3a knockout in AgRP neurons; whole-genome bisulfite sequencing; transcriptional profiling; voluntary running wheel assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with genome-wide epigenetic and transcriptional profiling plus defined behavioral phenotype\",\n      \"pmids\": [\"31792207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TET3 dioxygenase in AgRP neurons controls appetite by dynamically associating with the Agrp promoter in response to leptin signaling; TET3 induces 5-hydroxymethylcytosine (5hmC) modification at the Agrp promoter, which is associated with a chromatin-modifying complex leading to transcription inhibition. CRISPR-mediated ablation of Tet3 in AgRP neurons causes hyperphagia, obesity, diabetes, and upregulation of Agrp, Npy, and Slc32a1.\",\n      \"method\": \"CRISPR-mediated conditional Tet3 knockout in AgRP neurons; ChIP assays for TET3 at Agrp promoter; 5hmC modification analysis; leptin treatment experiments in mouse and human cells\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — CRISPR KO with mechanistic chromatin-level analysis showing TET3 binding and 5hmC modification at target promoter\",\n      \"pmids\": [\"36189793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Agpat5 expressed in AgRP neurons is required for hypoglycemia-induced AgRP neuron activation, vagal nerve activity, and glucagon secretion. Inactivation of Agpat5 leads to increased fatty acid oxidation and ATP production; suppressing Cpt1a-dependent fatty acid import into mitochondria restores hypoglycemia sensing, indicating that Agpat5 partitions fatty acyl-CoAs away from mitochondrial oxidation to ensure ATP faithfully reflects glycemia.\",\n      \"method\": \"Conditional Agpat5 knockout in AgRP neurons; vagal nerve recording; glucagon measurement; mitochondrial fatty acid oxidation assays; Cpt1a inhibition rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with defined circuit-level (vagal activity) and metabolic (glucagon, fatty acid oxidation) readouts\",\n      \"pmids\": [\"36180454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Transcription factors Dlx1/2 and Otp coordinate the generation of hypothalamic AgRP neurons; Otp is required for generation of AgRP neurons, and Dlx1/2 suppress AgRP neuronal fate by directly repressing Otp gene expression. Dlx1/2-deficient mice show increased AgRP neuron numbers and consume less energy.\",\n      \"method\": \"Conditional Dlx1/2 knockout mice; in situ hybridization; chromatin binding assays showing Dlx1/2 binding to Otp gene; neuronal counting\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with direct binding evidence and defined developmental phenotype\",\n      \"pmids\": [\"29795232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Asprosin activates AgRP neurons via binding to protein tyrosine phosphatase receptor δ (Ptprd); this stimulatory effect requires the small-conductance calcium-activated potassium (SK3) channel. Asprosin/Ptprd signaling modulates SK current in AgRP neurons, and AgRP-specific deletion of SK3 blocks asprosin-induced AgRP activation and overeating.\",\n      \"method\": \"AgRP-specific SK3 knockout; electrophysiology (SK current measurement); pharmacological and genetic Ptprd blockade; food intake assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — cell-type-specific KO with electrophysiological mechanistic dissection of intracellular signaling\",\n      \"pmids\": [\"36812308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CaMK1D in AgRP/NPY neurons mediates ghrelin-dependent food intake. Ghrelin activates CaMK1D, which drives CREB phosphorylation and CREB-dependent expression of AgRP/NPY neuropeptides in fibre projections to the PVN. Deletion of Camk1d in AgRP/NPY but not POMC neurons recapitulates resistance to ghrelin and protection against diet-induced obesity.\",\n      \"method\": \"Global and AgRP-specific Camk1d knockout; CREB phosphorylation assays; neuropeptide expression in PVN projections; ghrelin administration and food intake measurement\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with identified signaling substrate (CREB) and downstream neuropeptide readout\",\n      \"pmids\": [\"37277610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The C-terminal domain (87–132 aa) of human AGRP contains an inhibitor cystine knot (ICK) motif with five disulfide bridges that is sufficient for full antagonist/inverse agonist activity at MC3R and MC4R. NMR structure of AGRP(87-132) enabled design of a mini-protein with equivalent receptor binding affinity and antagonism.\",\n      \"method\": \"NMR structure determination of AGRP(87-132); mini-protein design and synthesis; receptor binding and antagonism assays\",\n      \"journal\": \"Medicinal research reviews\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with functional validation of the ICK motif domain\",\n      \"pmids\": [\"16044415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Chicken MC3R and MC4R are activated by α-MSH and ACTH; AgRP functions as an inverse agonist (inhibiting constitutive activity) and antagonist (blocking agonist action) for both receptors. Co-expression with MRAP2 increases their sensitivity to ACTH and modulates constitutive activity, and the MRAP2–MC3R/MC4R interaction was confirmed by co-immunoprecipitation.\",\n      \"method\": \"CHO cell expression; CRE-luciferase reporter assay; dual-luciferase assay; co-immunoprecipitation; qRT-PCR\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-based functional assays with co-IP for protein interaction; single lab in avian model\",\n      \"pmids\": [\"28512117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Heparin stimulates AgRP neurons and increases AgRP release by competing with insulin for insulin receptor binding on AgRP neurons, thereby inhibiting FoxO1 activity to promote AgRP release and feeding.\",\n      \"method\": \"Electrophysiology; pharmacological and molecular biological approaches; chemogenetics; AgRP release assays; insulin receptor binding competition assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including electrophysiology and molecular mechanism identification; single lab\",\n      \"pmids\": [\"28877477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Central α-klotho suppresses NPY/AgRP neuron activity via FGFR1/PI3K signaling, suppresses food intake, and improves glucose homeostasis. α-Klotho enhances miniature inhibitory postsynaptic currents in AgRP neurons, induces phosphorylation of AKTser473, ERKthr202/tyr204, and FOXO1ser256, and blunts AgRP gene transcription. FGFR1 inhibition abolishes these effects.\",\n      \"method\": \"i.c.v. α-klotho administration; ex vivo patch-clamp electrophysiology; immunohistochemistry; GT1-7 cell signaling assays; FGFR1 and PI3K pharmacological inhibition\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology plus signaling pathway dissection; single lab\",\n      \"pmids\": [\"32332158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AgRP neurons inhibit lateral hypothalamic orexin neurons via GABAergic synapses, and chemogenetic suppression of AgRP neurons increases innate avoidance behavior in an orexin receptor-dependent manner, defining an inhibitory GABAergic AgRP→orexin hypothalamic neurocircuit that modulates spatial exploration.\",\n      \"method\": \"Optogenetic inhibition of orexin neurons; calcium recording of orexin cell activity; chemogenetic suppression of AgRP neurons; pharmacological orexin receptor blockade\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — optogenetics and chemogenetics with pharmacological validation of circuit; single lab\",\n      \"pmids\": [\"32667686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NPY derived from AgRP neurons controls feeding via Y1 receptors and energy expenditure/locomotion via Y2 receptors. Conditional deletion of Npy only in AgRP neurons results in delayed feeding onset upon AgRP neuron stimulation. Rescue with Y1-selective NPY ligands restores feeding/respiratory quotient, while Y2-selective ligands restore energy expenditure and locomotion.\",\n      \"method\": \"Conditional Npy knockout in AgRP neurons (Agrpcre/+;Npylox/lox); DREADD activation; Y-receptor-selective ligand rescue experiments; metabolic phenotyping\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with receptor-selective rescue experiments identifying distinct downstream pathways\",\n      \"pmids\": [\"35167990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cold exposure in the medial preoptic area (mPOA) activates cold-responsive neurons that make excitatory synapses onto ARCAgRP neurons. Inhibition of either ARCAgRP neurons or ARC-projecting mPOA neurons attenuates cold-evoked feeding, and activation of the mPOA-to-ARC projection increases food intake, defining an mPOA→ARCAgRP excitatory pathway mediating cold-evoked eating.\",\n      \"method\": \"Calcium imaging; optogenetic activation/inhibition of mPOA-ARC projection; food intake measurement; cold exposure paradigm\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — circuit-specific optogenetics with defined behavioral phenotype; single lab\",\n      \"pmids\": [\"34380037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MC3R expression within AgRP neurons is required for normal activation of AgRP neurons in response to fasting, cold exposure, and ghrelin, while having no effect on inhibition of AgRP neurons by food detection. MC3R at AgRP nerve terminals regulates GABA release onto secondary MC4R-expressing neurons.\",\n      \"method\": \"Conditional MC3R knockout in AgRP neurons; c-Fos immunostaining in response to fasting/cold/ghrelin; calcium imaging; electrophysiology\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional cell-type-specific KO with multiple defined stimuli and bidirectional functional readouts\",\n      \"pmids\": [\"37792535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Dopamine receptor D1 (Drd1) expressed in AgRP/NPY neurons is required for appropriate responses to high-fat diet. Drd1 stimulation is sufficient to induce voracious feeding. High-fat diet delivery after food deprivation acutely induces dopamine release in the ARC, and Drd1AgRP-KO mice exhibit attenuated foraging and refeeding of HFD, positioning Drd1 signaling in AgRP neurons as an integrator of hedonic and homeostatic feeding circuits.\",\n      \"method\": \"AgRP/NPY neuron-specific Drd1 knockout; optogenetic stimulation; dopamine biosensor (dLight) measurement in ARC; food intake assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO combined with in vivo dopamine sensing and optogenetics\",\n      \"pmids\": [\"36450244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Insulin signaling in AgRP neurons of the mediobasal hypothalamus is required for insulin-mediated lowering of plasma branched-chain amino acids (BCAAs) and induction of hepatic BCAA catabolism. Chemogenetic stimulation of AgRP neurons raises plasma BCAAs and impairs hepatic BCAA degradation, and acute stimulation of vagal motor neurons is sufficient to decrease plasma BCAAs, suggesting AgRP neuron control of BCAAs is mediated via vagal outflow.\",\n      \"method\": \"AgRP neuron-specific insulin receptor KO; hyperinsulinemic clamp; DREADD activation of AgRP neurons; plasma BCAA measurement; vagal motor neuron stimulation\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO combined with chemogenetics and circuit-level vagal stimulation\",\n      \"pmids\": [\"33115827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Iron overload in AgRP neurons (via transferrin receptor 1/Tfrc-mediated iron uptake) increases AgRP neuron activity and drives overeating and adiposity. Reduction of iron overload by central deferoxamine or Tfrc deletion in AgRP neurons inhibits AgRP neuron activity, improves insulin and leptin sensitivity, and inhibits iron-induced oxidative stress, ER stress, NF-κB signaling, and SOCS3 expression.\",\n      \"method\": \"AgRP-specific Tfrc conditional KO; pharmacological iron chelation; electrophysiology; oxidative stress markers; insulin/leptin sensitivity assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with pharmacological validation and multiple mechanistic readouts; single lab\",\n      \"pmids\": [\"38460132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-33 plays a critical role in the regulation of AgRP neuron activity and feeding behavior; loss of miR-33 leads to increased feeding, obesity, and metabolic dysfunction in mice, with effects mediated through multiple miR-33 target genes involved in mitochondrial biogenesis and fatty acid metabolism in AgRP neurons.\",\n      \"method\": \"Unique mouse models with miR-33 deletion; metabolic phenotyping; target gene expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined metabolic phenotypes and target gene identification; single lab\",\n      \"pmids\": [\"38459068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Microglia in the hypothalamic arcuate nucleus during postnatal development regulate AgRP neuron maturation by engulfing perineuronal net (PNN) components surrounding AgRP neurons. Microglial depletion during this critical period increases AgRP neuron number and fiber density, increases neonatal feeding, and leads to increased PNN formation and enhanced leptin sensitivity in ARC.\",\n      \"method\": \"Microglial depletion; immunostaining; ex vivo PNN engulfment assay; electrophysiology for leptin sensitivity; neonatal feeding assays\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic/pharmacological depletion with multiple mechanistic readouts; single lab\",\n      \"pmids\": [\"38001338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The PDK1-FoxO1 signaling pathway in AgRP neurons promotes bone formation via the GHRH-GH-IGF1 axis; AgRP neuron-specific PDK1 knockout mice show reduced stature, decreased bone mineral density, suppressed osteoblast activity, enhanced osteoclast activity, and reduced plasma GH and IGF-1 levels with decreased GHRH mRNA in ARC. These abnormalities are rescued by additional expression of transactivation-defective FoxO1.\",\n      \"method\": \"AgRP neuron-specific PDK1 knockout; micro-CT/QCT; bone histomorphometry; plasma hormone measurement; rescue with FoxO1 mutant\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with epistasis rescue experiment; single lab\",\n      \"pmids\": [\"28462077\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AGRP is an endogenous inverse agonist/antagonist at melanocortin-3 and -4 receptors (acting via an inhibitor cystine knot C-terminal domain to reduce MC4R constitutive activity and block α-MSH signaling), co-released with NPY and GABA from hypothalamic arcuate AgRP neurons, where it promotes feeding and energy storage; AgRP neuron activity is regulated by leptin (via FoxO1/Stat3 transcriptional control at the Agrp promoter and TET3/5hmC epigenetic mechanisms), insulin (via IR-PDK1-FoxO1 signaling), ghrelin (via GHSR-CaMK1D-CREB signaling), AMPK-PAK-dependent synaptic plasticity, and inputs from astrocytes (via prostaglandin E2-EP2), mPOA cold-sensing neurons, and dopamine D1 receptors; downstream, AgRP neurons regulate energy expenditure via a dlDRN-serotonin circuit, hepatic glucose production and BCAA catabolism via vagal outflow, liver autophagy via NPY/PVH-CRH/corticosterone signaling, substrate utilization via lipogenesis, and bone metabolism via the GHRH-GH-IGF1 axis, with GABA release to the parabrachial nucleus being essential for preventing anorexia.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking through the papers, I need to classify each as KEEP (about canonical AGRP protein) or EXCLUDE (alias collision, off-target, etc.).\n\nMany papers in the corpus are clearly off-target (DNA chips, sperm preparation, ART/assisted reproductive technology, HIV, mastocytosis, etc.) - these are EXCLUDE.\n\nPapers about AgRP/AGRP neurons and the canonical neuropeptide are KEEP.\n\nNow I'll extract mechanistic discoveries from KEPT papers only.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"AGRP (then called ART) was identified as a hypothalamic neuropeptide structurally related to agouti protein, acting as a potent selective antagonist of melanocortin receptors MC3R and MC4R. Recombinant AGRP inhibited melanocortin receptor signaling, and ubiquitous overexpression in transgenic mice caused obesity without altering pigmentation, establishing AGRP as a downstream mediator of leptin signaling in body weight regulation.\",\n      \"method\": \"Recombinant protein pharmacology at cloned melanocortin receptors; transgenic mouse overexpression; in situ hybridization showing arcuate nucleus-restricted expression; expression elevated ~10-fold in ob/ob and db/db mice\",\n      \"journal\": \"Science; Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — two independent labs, receptor antagonism assays, transgenic models, replicated\",\n      \"pmids\": [\"9311920\", \"9119224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Ubiquitous overexpression of the human AGRP cDNA in transgenic mice caused obesity, demonstrating that AGRP itself (not just agouti) promotes weight gain through a melanocortin receptor-dependent mechanism.\",\n      \"method\": \"Transgenic mouse overexpression of human AGRP cDNA\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean transgenic gain-of-function with defined obesity phenotype\",\n      \"pmids\": [\"9354787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The C-terminal fragment AGRP(83-132) administered intracerebroventricularly increased food intake for up to 24 hours and blocked alpha-MSH-induced feeding reduction, demonstrating that the C-terminal domain is sufficient for MC3R/MC4R antagonism and long-lasting orexigenic activity in vivo.\",\n      \"method\": \"ICV injection in rats; in vitro cAMP inhibition assay at MC3R and MC4R\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro receptor assay combined with in vivo ICV pharmacology\",\n      \"pmids\": [\"9751529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The disulfide bond structure of recombinant human AGRP was determined biochemically: five disulfide bonds were identified with connectivity C67-C82, C74-C88, C81-C99, C85-C109, C90-C97, homologous to omega-agatoxin IVB, establishing the cysteine-knot scaffold.\",\n      \"method\": \"Stepwise partial reduction with TCEP, alkylation with NEM or fluorescein-maleimide, peptide mapping, sequence analysis, and mass spectrometry\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical determination of disulfide connectivity with multiple orthogonal methods\",\n      \"pmids\": [\"9724530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AGRP binds specifically to melanocortin receptors MC3R, MC4R, and MC5R but not MC1R or MC2R. The C-terminal domain AGRP(87-132) is equipotent to full-length AGRP for receptor binding and inhibition of alpha-MSH-stimulated cAMP. The RFF triplet (residues 111-113) and the loop defined by Cys-110 to Cys-117 are critical for receptor binding affinity and antagonism.\",\n      \"method\": \"Chemical protein synthesis of AGRP variants; radioiodinated [125I]AGRP(87-132) binding assays; competitive displacement with NDP-MSH; cAMP inhibition assays at cloned melanocortin receptors\",\n      \"journal\": \"Molecular endocrinology; Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted binding with synthetic protein, mutagenesis, replicated across two labs\",\n      \"pmids\": [\"9892020\", \"9893984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Extracellular loops 2 and 3 (exoloops 2 and 3) of MC4R are critical determinants of AGRP binding specificity. Swapping exoloops 2 and 3 from MC4R into MC1R conferred AGRP binding to MC1R, while the reverse substitutions abolished AGRP binding at MC4R, without affecting alpha-MSH binding.\",\n      \"method\": \"Chimeric receptor constructs of MC1R and MC4R expressed in cells; AGRP(87-132) binding assays; cAMP inhibition assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — chimeric receptor mutagenesis with binding and functional assays\",\n      \"pmids\": [\"10318826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NMR structure of minimized AGRP (MARP, 46 residues, C-terminal region) revealed three major loops with four of five disulfide bridges at the base; the fold lacks canonical secondary structure despite being well-defined, challenging earlier toxin-homology models based on cysteine spacing alone.\",\n      \"method\": \"2D 1H NMR of chemically synthesized MARP\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure determination of chemically synthesized protein\",\n      \"pmids\": [\"10371151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"High-resolution NMR structure of AGRP(87-132) showed a three-stranded antiparallel beta-sheet with the inhibitor cystine knot (ICK) fold — the first mammalian protein assigned to the ICK superfamily. The Arg-Phe-Phe triplet is presented by the hairpin turn for melanocortin receptor binding, and a second contact loop in the first 16 residues confers MC3R/MC4R selectivity distinct from agouti's MC1R preference.\",\n      \"method\": \"1H NMR at 800 MHz of chemically synthesized AGRP(87-132)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution NMR structure with functional interpretation\",\n      \"pmids\": [\"11747427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Ghrelin stimulates feeding via activation of NPY/AGRP neurons in the hypothalamus. Intracerebroventricular ghrelin induced Fos expression in NPY and AGRP neurons; antibodies and antagonists against NPY and AGRP abolished ghrelin-induced feeding, demonstrating that AGRP signaling is required downstream of ghrelin for its orexigenic effect.\",\n      \"method\": \"ICV ghrelin injection in rats; Fos immunohistochemistry; ICV antibody and antagonist blockade; ghrelin receptor-deficient rats\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological epistasis with antibody blockade and antagonists, replicated\",\n      \"pmids\": [\"11196643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NMR structure and pharmacology of a designed 34-residue AGRP mini-protein (cystine knot only) confirmed that the cystine knot domain alone contains the melanocortin receptor contact points and is sufficient for antagonist activity with the same MC3R/MC4R selectivity profile as AGRP(87-132).\",\n      \"method\": \"NMR structure determination; binding and cAMP inhibition assays at MC3R and MC4R\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure plus pharmacological validation, mutagenesis by domain deletion\",\n      \"pmids\": [\"12056887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RNA interference-mediated reduction (~50%) of hypothalamic AGRP mRNA and peptide increased metabolic rate and reduced body weight without changing food intake, demonstrating a role for AGRP in regulating energy expenditure independently of feeding behavior.\",\n      \"method\": \"RNAi in vivo in rat hypothalamus; AGRP peptide immunoreactivity; metabolic rate measurement\",\n      \"journal\": \"BMC neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with metabolic phenotype, single lab\",\n      \"pmids\": [\"12423556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Zebrafish AGRP is a conserved ortholog (36-40% identity to human/mouse) expressed exclusively in the hypothalamus, and its transcript is significantly upregulated by fasting while POMC is unchanged, demonstrating conservation of the melanocortin system regulation by metabolic state in teleosts.\",\n      \"method\": \"cDNA cloning; RT-PCR; in situ hybridization; fasting experiments in adult zebrafish\",\n      \"journal\": \"Endocrine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ortholog characterization with expression and fasting regulation; single lab\",\n      \"pmids\": [\"14709799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A 42.5-kb genomic region upstream of Agrp, containing three evolutionarily conserved regions between mouse and human, is necessary and sufficient for arcuate nucleus-specific and fasting-responsive Agrp expression, as tested with BAC reporter constructs in transgenic mice.\",\n      \"method\": \"BAC transgenic reporter mice with varying flanking sequence; in situ hybridization and reporter expression in transgenic lines\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic reporter deletion analysis defining regulatory regions\",\n      \"pmids\": [\"15345681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Leptin and insulin directly inhibit AGRP peptide release from perifused rat hypothalamus in vitro: both leptin (10nM-100nM) and insulin (100nM) significantly decreased depolarization-stimulated AGRP release. Fasting decreased the gamma3-MSH/AGRP release ratio, indicating a shift toward net melanocortin receptor inhibition.\",\n      \"method\": \"Perifused rat hypothalamic slice preparation; radioimmunoassay of AGRP and gamma3-MSH peptide release\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct peptide release assay from hypothalamic tissue, multiple hormone conditions tested\",\n      \"pmids\": [\"15680952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FoxO1 mediates leptin-regulated Agrp transcription by opposing Stat3 action. A constitutively nuclear FoxO1 in the arcuate nucleus abolished leptin's ability to suppress Agrp expression and food intake. FoxO1 and Stat3 exert opposing actions at Agrp and Pomc promoters through coactivator-corepressor exchange: FoxO1 promotes coactivator recruitment at Agrp and corepressor recruitment at Pomc.\",\n      \"method\": \"Adenoviral delivery of FoxO1 mutants to arcuate nucleus; chromatin immunoprecipitation; promoter-reporter assays; in vivo feeding and gene expression studies\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (viral gene delivery, ChIP, reporter assays, in vivo phenotype)\",\n      \"pmids\": [\"16604086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AGRP acts as an inverse agonist at MC4R: it reduces basal cAMP production below constitutive activity. The N-terminus and distal C-terminus of MC4R are required for AGRP inverse agonism. Residues D90 in TM2 and D298 in TM7 of MC4R are essential for both NDP-MSH activation and AGRP inverse agonism.\",\n      \"method\": \"Chimeric MC4R/MC1R receptors; site-directed mutagenesis (D90A, D298A); cAMP assays in transfected cells\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of receptor combined with chimeric receptor analysis and functional assays\",\n      \"pmids\": [\"16820227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AGRP induces beta-arrestin-mediated endocytosis of MC3R and MC4R as an agonist of the endocytosis pathway, despite being an inverse agonist of G protein signaling. AGRP promotes interaction of both MCRs with beta-arrestins (shown by BRET), and beta-arrestin knockdown reduces AGRP-promoted endocytosis. This mechanism reduces MCR cell-surface availability.\",\n      \"method\": \"BRET assay for beta-arrestin/receptor interaction; siRNA knockdown of beta-arrestins; receptor internalization assays in HEK293 and hypothalamic neuronal cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — BRET, RNAi epistasis, multiple cell types including endogenous MC4R-expressing neurons\",\n      \"pmids\": [\"17041250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sirt1 promotes AgRP neuronal activity and connectivity. Pharmacological inhibition of brain Sirt1 decreased AgRP neuronal activity and inhibitory synaptic inputs to POMC neurons. Selective knockout of Sirt1 in AgRP neurons reduced electrophysiological responses to ghrelin, decreased food intake, lean mass, fat mass and body weight. The effect required appropriate mitochondrial redox adaptation via UCP2.\",\n      \"method\": \"Pharmacological Sirt1 inhibition (EX-527) i.p. and i.c.v.; Cre-Lox conditional knockout of Sirt1 in AgRP neurons; electrophysiology; synaptic quantification\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with electrophysiology, pharmacology, and morphological endpoints\",\n      \"pmids\": [\"20810901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Chemogenetic (DREADD) activation of AgRP neurons rapidly and dramatically induced feeding, reduced energy expenditure, and increased fat stores; inhibition of AgRP neurons in hungry mice reduced food intake. AgRP neuron activity is both necessary and sufficient for feeding behavior.\",\n      \"method\": \"DREADD (hM3Dq/hM4Di) chemogenetics in AgRP-Cre mice; food intake, energy expenditure, and body composition measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional chemogenetic manipulation with multiple behavioral and metabolic readouts\",\n      \"pmids\": [\"21364278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GABAergic output from AgRP neurons to the parabrachial nucleus (PBN) is the critical mechanism preventing anorexia after AgRP neuron ablation. Chronic delivery of bretazenil (GABA-A partial agonist) to the PBN restored feeding after AgRP neuron ablation, whereas chronic MC4R antagonism was inadequate, demonstrating that AgRP neurons prevent anorexia primarily via GABA, not AgRP peptide, signaling.\",\n      \"method\": \"Diphtheria toxin ablation of AgRP neurons; chronic intra-PBN cannula delivery of bretazenil or MC4R antagonist; body weight and feeding measurements\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological circuit epistasis with defined anatomical targeting\",\n      \"pmids\": [\"21211531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NMDA receptors (NMDARs) on AgRP neurons are required for fasting-induced activation. Deletion of NMDARs from AgRP neurons reduced body weight, fat, and food intake and abolished fasting-induced increases in c-Fos, Agrp/Npy mRNA, AMPA-mediated EPSCs, and neuronal firing. Fasting increased dendritic spines specifically on AgRP (not POMC) neurons, indicating fasting-induced synaptogenesis dependent on NMDARs.\",\n      \"method\": \"AgRP- and POMC-specific NMDAR conditional knockout mice; electrophysiology; c-Fos immunohistochemistry; dendritic spine quantification; qPCR\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — cell-type-specific conditional KO with electrophysiology, morphology, and gene expression readouts\",\n      \"pmids\": [\"22325203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"AgRP neurons are hypophysiotropic in teleosts, projecting directly to the pituitary to regulate multiple pituitary hormones. AgRP-mediated MC4R suppression is essential for early larval growth in teleosts, revealing a fundamental difference in central melanocortin neuroendocrine function between teleosts and mammals.\",\n      \"method\": \"Larval teleost neuroanatomy; genetic manipulation of MC4R signaling; growth phenotype analysis\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — teleost ortholog, neuroanatomical and genetic evidence, single lab\",\n      \"pmids\": [\"22245570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AgRP neuron-specific ghrelin receptor (GHSR) re-expression in otherwise GHSR-null mice fully restored the lowering of blood glucose during caloric restriction via glucagon rises and hepatic gluconeogenesis induction, but only partially restored ghrelin-stimulated feeding, demonstrating that GHSR in AgRP neurons is sufficient for ghrelin's glucoregulatory effects but not solely responsible for orexigenic effects.\",\n      \"method\": \"Tamoxifen-inducible AgRP-CreERT2 transgenic GHSR re-expression in GHSR-null mice; food intake, blood glucose, glucagon, and hepatic gluconeogenesis measurements\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific receptor rescue in null background, multiple metabolic endpoints\",\n      \"pmids\": [\"24567905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AMPK in AgRP neurons phosphorylates p21-activated kinase (PAK) to drive fasting-induced spinogenesis and increased excitatory synaptic activity. Fasting increases AMPK activity in AgRP neurons; AMPK activity in AgRP neurons is necessary and sufficient for fasting-induced spine formation. PAK is identified as the direct AMPK phosphorylation target mediating this synaptic plasticity.\",\n      \"method\": \"Neuron-specific AMPK activity measurement and manipulation; AgRP-specific conditional kinase knockdown/activation; dendritic spine quantification; electrophysiology; AMPK substrate identification\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — cell-type-specific kinase manipulation with substrate identification and morphological/electrophysiological readouts\",\n      \"pmids\": [\"27321921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Insulin receptor signaling in AgRP neurons controls hepatic glucose production but not adipose tissue lipolysis. AgRP-specific insulin receptor knockout mice showed impaired suppression of hepatic glucose output by insulin, while adipose tissue lipolysis was unaltered, establishing a specific role for insulin signaling in AgRP neurons in glucose (but not lipid) homeostasis.\",\n      \"method\": \"AgRP-specific insulin receptor knockout mice; hyperinsulinemic-euglycemic clamps; hepatic glucose production measurement; lipolysis assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with gold-standard metabolic clamp studies\",\n      \"pmids\": [\"28385803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FOXO1 in AgRP neurons controls food intake and glucose homeostasis via Gpr17, a G protein-coupled receptor. AgRP neuron-specific Gpr17 knockout mice phenocopied AgRP neuron-specific FOXO1 knockout: reduced food intake, increased energy expenditure, increased satiety, leanness, and increased CNS sensitivity to insulin and leptin.\",\n      \"method\": \"AgRP-specific Gpr17 conditional knockout mice; food intake, body composition, energy expenditure, glucose tolerance, and insulin sensitivity measurements\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with genetic epistasis to FOXO1, multiple metabolic phenotypes\",\n      \"pmids\": [\"26180086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Transcription factors Dlx1/2 and Otp coordinately specify AgRP neuron identity: Dlx1/2-deficient mice show loss of GHRH neurons and an increase of AgRP neurons; Dlx1/2 directly binds and represses the Otp gene, and Otp is required for AgRP neuron generation. Thus, the Dlx1/2-Otp axis synchronously specifies and segregates GHRH and AgRP neuronal identities.\",\n      \"method\": \"Conditional Dlx1/2 knockout mice; Otp knockout mice; chromatin immunoprecipitation for Dlx1/2 binding at Otp locus; cell counting by immunofluorescence; growth and metabolic phenotype analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrating direct binding, conditional KO epistasis, replicated cell counts\",\n      \"pmids\": [\"29795232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NPY signaling is uniquely required for the long-lasting (sustained) hunger drive produced by AgRP neuron stimulation. Selective deletion of Npy (but not Agrp or GABA signaling) from AgRP neurons abolished optogenetically-stimulated feeding when using brief stimulation paradigms mimicking natural regulation; this was rescued by NPY re-expression specifically in AgRP neurons.\",\n      \"method\": \"Conditional deletion of Npy, Agrp, or GABA signaling capacity in AgRP neurons; optogenetic stimulation; rescue by Cre-dependent Npy re-expression\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — selective gene deletion with rescue, optogenetics, multiple signal pathway comparisons\",\n      \"pmids\": [\"31033437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Activation of AgRP neurons rapidly shifts whole-body substrate utilization toward carbohydrate and away from fat oxidation, even without caloric intake. This is coupled to increased lipogenesis, and inhibition of fatty acid synthase blunted these effects. Ablation of AgRP neurons impaired fat mass accumulation, establishing AgRP neurons as regulators of substrate utilization and adiposity.\",\n      \"method\": \"Chemogenetic activation/ablation of AgRP neurons; indirect calorimetry (respiratory quotient); fatty acid synthase inhibitor pharmacology; pair-feeding experiments; body composition analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation with pharmacological epistasis and metabolic readouts\",\n      \"pmids\": [\"30659173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNA methylation by Dnmt3a in AgRP neurons is required for normal epigenetic development and neuron-specific gene expression. Dnmt3a deletion in AgRP neurons caused a sedentary phenotype with reduced voluntary exercise and increased adiposity. Whole-genome bisulfite sequencing revealed promoter hypomethylation and increased expression of Bmp7 in AgRP neurons, implicating aberrant TGF-β signaling.\",\n      \"method\": \"AgRP-specific Dnmt3a conditional knockout; whole-genome bisulfite sequencing; transcriptional profiling; voluntary wheel running measurement; body composition\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with genome-wide methylation profiling and phenotypic characterization\",\n      \"pmids\": [\"31792207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Central α-klotho suppresses NPY/AgRP neuron activity via FGFR1/PI3K signaling. ICV α-klotho enhanced inhibitory postsynaptic currents onto AgRP neurons (patch clamp), induced phosphorylation of AKT, ERK, and FOXO1, and blunted AgRP gene transcription. FGFR1 inhibition abolished all downstream effects of α-klotho on AgRP neurons.\",\n      \"method\": \"ICV α-klotho administration; ex vivo patch clamp electrophysiology; immunohistochemistry; phosphorylation assays in GT1-7 hypothalamic cells; FGFR1/PI3K inhibitor pharmacology; glucose tolerance and body weight measurements\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology plus signaling assays and pharmacological epistasis, single lab\",\n      \"pmids\": [\"32332158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AgRP neurons triggered a feed-forward astrocyte-mediated auto-excitatory loop: activated AgRP neurons release GABA, which evokes mitochondrial adaptations in neighboring astrocytes and increased glial ensheathing of AgRP perikarya. Astrocytes then produce prostaglandin E2 (PGE2), which directly activates AgRP neurons via EP2 receptors, amplifying their own excitability.\",\n      \"method\": \"Chemogenetic and food deprivation/ghrelin activation of AgRP neurons; astrocyte mitochondrial imaging; GABA manipulation; PGE2 measurement; EP2 receptor pharmacology; microglial/astrocyte morphological analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple experimental approaches identifying a novel glia-neuron feed-forward circuit\",\n      \"pmids\": [\"33848272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A subgroup of AgRP neurons projecting non-collaterally to MC4R-expressing neurons in the dorsal lateral dorsal raphe nucleus (dlDRN) controls energy expenditure independently of feeding. MC4R-dlDRN neurons integrate presynaptic AgRP signaling to modulate downstream serotonergic neurons, and this circuit bidirectionally regulates body weight through sympathetic outflow reprogramming mitochondrial bioenergetics in brown and beige fat.\",\n      \"method\": \"Circuit-specific genetic manipulation; fiber photometry; electrophysiology; optogenetics; MC4R-dlDRN conditional knockouts; BAT metabolic assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multi-modal circuit dissection with multiple orthogonal methods\",\n      \"pmids\": [\"34112797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cold-responsive neurons in the medial preoptic area (mPOA) make excitatory synapses onto ARCAgRP neurons. Inhibition of either ARCAgRP neurons or ARC-projecting mPOA neurons attenuated cold-evoked feeding, while activation of the mPOA-to-ARC projection increased food intake, identifying an mPOA→AgRP circuit for cold-evoked feeding.\",\n      \"method\": \"In vivo calcium imaging; optogenetics; circuit tracing; chemogenetics; cold exposure experiments with food intake measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional circuit manipulation with calcium imaging, single lab\",\n      \"pmids\": [\"34380037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TET3 controls feeding and stress responses in AgRP neurons by regulating DNA demethylation at the Agrp promoter in response to leptin. CRISPR-mediated Tet3 ablation in AgRP neurons caused hyperphagia, obesity, and diabetes with upregulation of Agrp, Npy, and Slc32a1 (vesicular GABA transporter). Leptin dynamically recruits TET3 to the Agrp promoter to produce 5-hydroxymethylcytosine, recruiting a chromatin-modifying complex for transcription inhibition.\",\n      \"method\": \"CRISPR Tet3 knockout in AgRP neurons; ChIP for TET3 at Agrp promoter; 5hmC modification assay; chromatin complex analysis; food intake, body weight, glucose tolerance, and behavior measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrating dynamic TET3 recruitment at Agrp promoter with 5hmC modification, combined with in vivo CRISPR KO phenotype\",\n      \"pmids\": [\"36189793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NPY released from AGRP neurons controls feeding via Y1 receptors and controls energy expenditure and locomotion via Y2 receptors. Conditional knockout of Npy only in AGRP neurons increased feeding and raised respiratory quotient (rescued by Y1R agonist), while reducing energy expenditure and locomotion (rescued by Y2R agonist), dissecting the pathway-specific functions of NPY from AGRP neurons.\",\n      \"method\": \"Conditional Agrp-cre;Npy-lox knockout mice; DREADD chemogenetics; selective Y1R/Y2R agonist rescue experiments; metabolic phenotyping\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor subtype-selective rescue experiments with conditional KO; multiple metabolic endpoints\",\n      \"pmids\": [\"35167990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Food-evoked dopamine release in the arcuate nucleus acts via dopamine receptor D1 (Drd1) expressed on AgRP/NPY neurons to promote feeding. High-fat diet delivery after food deprivation acutely induced dopamine release in the ARC; AgRP-specific Drd1 knockout mice showed attenuated foraging and refeeding of HFD, positioning Drd1 signaling in AgRP neurons as integrator of hedonic and homeostatic feeding circuits.\",\n      \"method\": \"In vivo dopamine measurement in ARC; AgRP-specific Drd1 conditional knockout; chemogenetic stimulation of Drd1/AgRP co-expressing neurons; foraging and feeding behavior tests\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with in vivo neurochemical measurement, single lab\",\n      \"pmids\": [\"36450244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Lipid biosynthesis enzyme Agpat5 in AgRP neurons is required for hypoglycemia sensing and glucagon secretion. Agpat5 inactivation in AgRP neurons led to increased fatty acid oxidation and ATP production, impairing the fall in intracellular ATP that normally triggers neuronal firing in response to low glucose. Suppressing Cpt1a-dependent mitochondrial fatty acid import restored hypoglycemia sensing.\",\n      \"method\": \"AgRP-specific Agpat5 conditional knockout mice; vagal nerve activity recording; glucagon secretion measurement; metabolic flux assays; Cpt1a inhibitor pharmacological rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with metabolic rescue demonstrating the enzymatic mechanism\",\n      \"pmids\": [\"36180454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CaMK1D in AgRP neurons mediates ghrelin-dependent food intake via phosphorylation of CREB and CREB-dependent expression of AgRP/NPY neuropeptides in projections to the PVN. Global or AgRP-specific Camk1d knockout mice are resistant to ghrelin, gain less weight, and are protected against HFD-induced obesity.\",\n      \"method\": \"Global and AgRP-specific Camk1d conditional knockout mice; ghrelin challenge; CREB phosphorylation assays; AgRP/NPY neuropeptide quantification in PVN projections; HFD feeding experiments\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with signaling mechanism (CREB phosphorylation) and neuropeptide expression readout in projection targets\",\n      \"pmids\": [\"37277610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MC3R expression within AgRP neurons is required for normal fasting-, cold-, and ghrelin-induced activation of AgRP neurons. MC3R knockout mice and conditional AgRP-specific MC3R knockout mice show defective AgRP neuron activation under energy deficit, while food-induced inhibition of AgRP neurons remains normal.\",\n      \"method\": \"MC3R global and AgRP-specific conditional knockout mice; c-Fos induction after fasting, cold, and ghrelin; calcium imaging\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with multiple activating stimuli tested\",\n      \"pmids\": [\"37792535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AgRP neurons relay control of liver autophagy during energy deprivation via NPY release in the PVH: NPY inhibits NPY1R-expressing PVH neurons, disinhibiting PVHCRH neurons that raise circulating corticosterone, which activates hepatic glucocorticoid receptors to induce autophagy and ketogenesis. Optogenetic/chemogenetic AgRP neuron activation induces hepatic autophagy and phosphorylation of autophagy regulators; inhibiting AgRP neurons during fasting abrogates hepatic autophagy.\",\n      \"method\": \"Optogenetics and chemogenetics; AgRP neuron-specific ablation; NPY1R pharmacology; corticosterone measurement; hepatic glucocorticoid receptor knockdown; autophagy and phosphorylation assays\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional circuit manipulation with mechanistic pathway dissection across multiple tissues\",\n      \"pmids\": [\"37075752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Asprosin activates AgRP neurons via binding to Ptprd (protein tyrosine phosphatase receptor δ), which reduces SK3 channel (small-conductance calcium-activated K+ channel) current in AgRP neurons. AgRP-specific SK3 deletion blocked asprosin-induced AgRP activation and overeating; Ptprd deletion or knockdown abolished asprosin's effects on SK current and neuronal activity, identifying an asprosin-Ptprd-SK3 intracellular mechanism.\",\n      \"method\": \"AgRP-specific SK3 conditional knockout; electrophysiology (SK current measurements); Ptprd genetic manipulation; asprosin deficiency models; chemogenetic and pharmacological approaches\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO combined with electrophysiological channel current measurements and receptor-specific epistasis\",\n      \"pmids\": [\"36812308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-33 regulates AgRP neuron activity and hunger. Loss of miR-33 increases feeding and causes obesity through dysregulation of multiple miR-33 target genes involved in mitochondrial biogenesis and fatty acid metabolism in AgRP neurons.\",\n      \"method\": \"Conditional miR-33 knockout mice with AgRP neuron specificity; transcriptional profiling; metabolic phenotyping; miR-33 target gene analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with target gene identification, single lab\",\n      \"pmids\": [\"38459068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Iron overload in AgRP neurons mediated by transferrin receptor 1 (Tfrc) promotes AgRP neuron hyperactivity, overeating, and adiposity via iron-induced oxidative stress, ER stress, NFκB signaling, and SOCS3 upregulation that impairs insulin and leptin sensitivity. Central deferoxamine or AgRP-specific Tfrc deletion reduced AgRP neuron activity and ameliorated diet-induced obesity.\",\n      \"method\": \"AgRP-specific Tfrc conditional knockout; central deferoxamine pharmacology; electrophysiology; oxidative stress and ER stress markers; insulin/leptin sensitivity assays; body composition measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic pathway analysis and pharmacological rescue, single lab\",\n      \"pmids\": [\"38460132\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AGRP is a hypothalamic neuropeptide with an inhibitor cystine knot (ICK) fold in its C-terminal domain that acts as a potent inverse agonist/antagonist at melanocortin MC3R and MC4R (binding via exoloops 2/3 of the receptor and requiring D90-TM2 and D298-TM7), co-released with NPY and GABA from arcuate nucleus neurons; it also promotes beta-arrestin-mediated MC3R/MC4R endocytosis, and its neuronal activity is regulated by multiple upstream signals (leptin via FoxO1-Stat3 transcriptional squelching and TET3-mediated 5hmC modification at the Agrp promoter; ghrelin via GHSR-CaMK1D-CREB; AMPK-PAK fasting-induced spinogenesis; insulin via insulin receptor-FOXO1-Gpr17; iron via Tfrc-oxidative stress; asprosin via Ptprd-SK3 channels; MC3R autocrine feedback), and AgRP neuron activation drives feeding (sustained by NPY via Y1R), shifts substrate utilization toward lipogenesis (via fatty acid synthase), controls energy expenditure via a dorsal raphe MC4R-serotonin circuit, regulates hepatic autophagy via NPY-PVH-corticosterone signaling, and controls blood glucose via glucagon secretion requiring GHSR and Agpat5-dependent ATP sensing.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AGRP is an endogenous inverse agonist and antagonist of melanocortin-3 and melanocortin-4 receptors, acting through a C-terminal inhibitor cystine knot domain to suppress constitutive MC4R signaling and block α-MSH-mediated receptor activation [PMID:16044415, PMID:16820227]. AGRP is co-released with NPY and GABA from hypothalamic arcuate nucleus AgRP neurons, whose activity is both necessary and sufficient to drive feeding, suppress energy expenditure, promote fat storage, and shift substrate utilization toward lipogenesis [PMID:21364278, PMID:30659173, PMID:31033437]. Transcriptional regulation of AGRP expression integrates leptin signaling (via opposing FoxO1/Stat3 actions and TET3-mediated 5hmC modification at the Agrp promoter), insulin signaling (via IR-PDK1-FoxO1), and ghrelin signaling (via GHSR-CaMK1D-CREB), while fasting-induced synaptic remodeling of AgRP neurons depends on AMPK-PAK-driven spinogenesis and NMDA receptor-dependent glutamatergic input [PMID:16604086, PMID:36189793, PMID:37277610, PMID:27321921, PMID:22325203]. Downstream, AgRP neurons regulate hepatic glucose production and BCAA catabolism via vagal outflow, liver autophagy via NPY/PVH-CRH/corticosterone signaling, energy expenditure via a dorsal raphe serotonergic circuit, and bone metabolism via the GHRH-GH-IGF1 axis, with GABAergic transmission to the parabrachial nucleus being essential for preventing starvation [PMID:28385803, PMID:33115827, PMID:37075752, PMID:34112797, PMID:28462077, PMID:21211531].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Whether AGRP controls energy balance through feeding alone or also through metabolic rate was unclear; RNAi knockdown of hypothalamic AGRP increased metabolic rate and reduced body weight without altering food intake, establishing a food-intake-independent metabolic role for AGRP.\",\n      \"evidence\": \"In vivo RNAi reducing hypothalamic AGRP mRNA ~50% in rats with metabolic rate and body weight measurement\",\n      \"pmids\": [\"12423556\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; not confirmed by genetic knockout at that time\", \"Mechanism linking AGRP to metabolic rate not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The structural basis for AGRP's receptor antagonism was resolved: the C-terminal domain (aa 87–132) contains an inhibitor cystine knot motif with five disulfide bridges sufficient for full antagonist/inverse agonist activity at MC3R and MC4R.\",\n      \"evidence\": \"NMR structure determination of AGRP(87–132) with functional receptor binding and antagonism assays\",\n      \"pmids\": [\"16044415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length AGRP structure not determined\", \"Structural basis of inverse agonism versus competitive antagonism not fully distinguished\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"How leptin transcriptionally suppresses Agrp was unknown; FoxO1 and Stat3 were shown to exert opposing actions on the Agrp promoter, with FoxO1 driving coactivator-corepressor exchange to activate Agrp transcription, and leptin acting through Stat3 to oppose this — establishing the core transcriptional logic of leptin-mediated Agrp suppression. Simultaneously, AGRP was shown to function as a true inverse agonist at MC4R, reducing basal cAMP, with specific MC4R residues (D90, D298) critical for this activity.\",\n      \"evidence\": \"Adenoviral FoxO1 mutant delivery to arcuate nucleus with promoter assays; MC4R chimeric receptor analysis and site-directed mutagenesis with cAMP readout\",\n      \"pmids\": [\"16604086\", \"16820227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of coactivators/corepressors at the Agrp promoter not fully defined\", \"Structural mechanism of AGRP inverse agonism at the receptor level unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"What intracellular metabolic sensors control AgRP neuron excitability was unclear; Sirt1 was identified as a regulator of AgRP neuron activity and synaptic connectivity, acting through mitochondrial UCP2-dependent redox signaling to modulate ghrelin responsiveness.\",\n      \"evidence\": \"Pharmacological Sirt1 inhibition and conditional Sirt1 knockout in AgRP neurons with electrophysiology and behavioral readouts\",\n      \"pmids\": [\"20810901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Sirt1 acts via direct deacetylation of specific AgRP neuron substrates beyond UCP2 unclear\", \"Relationship between Sirt1 and AMPK pathways in AgRP neurons not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Whether AgRP neuron activity is causally sufficient and necessary for feeding was demonstrated by bidirectional chemogenetic manipulation, which rapidly induced feeding and fat storage upon activation and reduced intake upon inhibition; separately, GABAergic output from AgRP neurons to the parabrachial nucleus was shown to be essential for preventing lethal anorexia.\",\n      \"evidence\": \"DREADD activation/inhibition of AgRP neurons in mice; diphtheria toxin ablation of AgRP neurons with GABA-A agonist rescue in PBN\",\n      \"pmids\": [\"21364278\", \"21211531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which downstream circuits mediate the energy expenditure versus feeding effects not yet dissected\", \"Whether GABA release from AgRP neurons to PBN is tonically required or only during metabolic stress not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"How fasting remodels AgRP neuron excitability was addressed: NMDA receptors were shown to be required for fasting-induced AgRP activation, spinogenesis, and increased glutamatergic input, while TXNIP in AgRP neurons was found to regulate energy expenditure and leptin sensitivity independently of food intake.\",\n      \"evidence\": \"Conditional NMDAR knockout in AgRP neurons with electrophysiology and spine counting; AgRP-specific TXNIP gain/loss-of-function models\",\n      \"pmids\": [\"22325203\", \"22815502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of increased glutamatergic input to AgRP neurons during fasting not identified\", \"Molecular link between TXNIP and leptin signaling pathway not fully characterized\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Whether ghrelin's glucoregulatory and orexigenic effects are both mediated by AgRP neurons was tested: GHSR re-expression exclusively in AgRP neurons of GHSR-null mice rescued glucose counter-regulation but not the full orexigenic response, dissociating these two ghrelin functions at the circuit level.\",\n      \"evidence\": \"Tamoxifen-inducible AgRP-specific GHSR re-expression in GHSR-null mice with glucose and glucagon measurements\",\n      \"pmids\": [\"24567905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which non-AgRP neurons mediate ghrelin's residual orexigenic effects not identified\", \"Downstream pathway from AgRP GHSR to hepatic gluconeogenesis not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"The molecular mechanism of fasting-induced synaptic plasticity in AgRP neurons was identified: AMPK activation in AgRP neurons is both necessary and sufficient for spinogenesis, acting through phosphorylation of PAK.\",\n      \"evidence\": \"Conditional bidirectional AMPK manipulation in AgRP neurons with spine counting and electrophysiology\",\n      \"pmids\": [\"27321921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PAK phosphorylation leads to actin remodeling and spine formation in AgRP neurons not determined\", \"Whether AMPK-PAK pathway intersects with NMDAR-dependent plasticity not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple new regulatory and effector pathways of AgRP neurons were identified: insulin receptor signaling in AgRP neurons was shown to be required for suppression of hepatic glucose production; Gpr17 was identified as an effector of FoxO1 orexigenic signaling; and PDK1-FoxO1 signaling in AgRP neurons was found to promote bone formation via the GHRH-GH-IGF1 axis.\",\n      \"evidence\": \"AgRP-specific insulin receptor KO with hyperinsulinemic clamps; AgRP-specific Gpr17 KO with metabolic phenotyping; AgRP-specific PDK1 KO with bone phenotyping and FoxO1 rescue\",\n      \"pmids\": [\"28385803\", \"26180086\", \"28462077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neural pathway from AgRP neurons to liver for hepatic glucose production control not fully mapped\", \"Whether Gpr17 is a direct FoxO1 transcriptional target in AgRP neurons requires ChIP confirmation\", \"Whether bone effects are specific to AGRP peptide or to NPY/GABA co-release not distinguished\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The specific neuropeptide mediating sustained AgRP neuron-driven feeding was identified as NPY rather than AGRP peptide or GABA, while AgRP neuron activation was also shown to shift whole-body substrate utilization toward carbohydrate oxidation and lipogenesis independently of caloric intake. Additionally, epigenetic programming by Dnmt3a in AgRP neurons was shown to regulate voluntary exercise and adiposity.\",\n      \"evidence\": \"Conditional deletion/rescue of NPY, AGRP, and GABA from AgRP neurons with optogenetic stimulation; DREADD activation with indirect calorimetry and fatty acid synthase inhibition; conditional Dnmt3a KO with WGBS and behavioral assays\",\n      \"pmids\": [\"31033437\", \"30659173\", \"31792207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NPY and AGRP peptide have distinct temporal dynamics at target sites not resolved\", \"How lipogenesis signal is transmitted from brain to peripheral tissue not fully defined\", \"How Dnmt3a-regulated genes alter AgRP neuron electrophysiology not characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Central regulatory inputs to AgRP neurons were expanded: α-klotho was shown to suppress AgRP neurons via FGFR1/PI3K signaling and FOXO1 phosphorylation, while insulin signaling in AgRP neurons was found to control hepatic BCAA catabolism via vagal outflow. Intracellular metabolic sensing was refined by the discovery that Agpat5 partitions fatty acyl-CoAs away from mitochondrial oxidation, ensuring AgRP neuron ATP levels faithfully reflect glycemia.\",\n      \"evidence\": \"i.c.v. α-klotho with electrophysiology and signaling assays; AgRP-specific insulin receptor KO with hyperinsulinemic clamp and vagal stimulation; conditional Agpat5 KO with fatty acid oxidation assays and Cpt1a rescue\",\n      \"pmids\": [\"32332158\", \"33115827\", \"36180454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether α-klotho acts physiologically on AgRP neurons or only at pharmacological doses unclear\", \"Whether vagal outflow mediating BCAA catabolism is the same circuit controlling hepatic glucose production not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Two new circuit-level mechanisms were identified: astrocytes form a feed-forward autoactivation loop with AgRP neurons via GABA-triggered prostaglandin E2/EP2 signaling, and a non-collateral AgRP→dlDRN→serotonin circuit bidirectionally regulates energy expenditure via sympathetic control of brown/beige fat thermogenesis. Cold-responsive mPOA neurons were also shown to provide excitatory input to AgRP neurons mediating cold-evoked feeding.\",\n      \"evidence\": \"Chemogenetics with electron microscopy and astrocyte-specific manipulations; circuit-specific genetic manipulation with fiber photometry and sympathetic nerve recording; optogenetic manipulation of mPOA-ARC projection with calcium imaging\",\n      \"pmids\": [\"33848272\", \"34112797\", \"34380037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether astrocyte-AgRP loop is dysregulated in obesity not tested\", \"Neurotransmitter identity of mPOA-to-AgRP projection not fully defined\", \"How MC4R in dlDRN reprograms mitochondrial bioenergetics in peripheral fat mechanistically unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Epigenetic control of Agrp transcription was further defined: TET3 dioxygenase associates with the Agrp promoter in response to leptin, inducing 5hmC modification that recruits chromatin-modifying complexes to silence Agrp transcription, and CRISPR ablation of Tet3 in AgRP neurons causes hyperphagia, obesity, and diabetes. Dopamine D1 receptor signaling in AgRP neurons was found to integrate hedonic and homeostatic feeding, and NPY's downstream effects were dissected to Y1 receptors (feeding) and Y2 receptors (energy expenditure/locomotion).\",\n      \"evidence\": \"CRISPR conditional Tet3 KO with ChIP and 5hmC analysis; AgRP-specific Drd1 KO with dLight dopamine sensing and optogenetics; conditional Npy KO with Y-receptor-selective ligand rescue\",\n      \"pmids\": [\"36189793\", \"36450244\", \"35167990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of chromatin-modifying complex recruited by TET3/5hmC at Agrp promoter not determined\", \"Source of dopamine reaching ARC AgRP neurons not fully mapped\", \"Whether Y1 and Y2 receptor-mediated effects operate through distinct downstream neuronal populations not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Multiple new regulators of AgRP neuron function were identified: CaMK1D mediates ghrelin-CREB-dependent AgRP/NPY neuropeptide expression; asprosin activates AgRP neurons via Ptprd-SK3 channel signaling; MC3R expression on AgRP neurons is required for fasting/cold/ghrelin-induced activation and regulates terminal GABA release onto MC4R neurons; AgRP neurons drive liver autophagy via NPY/PVH-CRH/corticosterone signaling; and miR-33 regulates AgRP neuron activity via mitochondrial/fatty acid metabolism genes. Microglia were shown to sculpt AgRP neuron development by engulfing perineuronal nets.\",\n      \"evidence\": \"AgRP-specific CaMK1D, SK3, MC3R, and miR-33 knockouts; optogenetic/chemogenetic activation with hepatic autophagy readouts and corticosterone measurement; microglial depletion with PNN engulfment assays\",\n      \"pmids\": [\"37277610\", \"36812308\", \"37792535\", \"37075752\", \"38459068\", \"38001338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CaMK1D-CREB pathway is the sole ghrelin signaling arm or acts in parallel with other pathways unknown\", \"How asprosin reaches AgRP neurons (peripheral vs. central source) unclear\", \"Whether MC3R on AgRP terminals functions as an autoreceptor for AgRP peptide not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Iron homeostasis was identified as a regulator of AgRP neuron excitability: iron overload via Tfrc-mediated uptake increases AgRP neuron activity and drives overeating through oxidative stress, ER stress, NF-κB, and SOCS3, with iron chelation or Tfrc deletion restoring insulin and leptin sensitivity.\",\n      \"evidence\": \"AgRP-specific Tfrc conditional KO; central deferoxamine; electrophysiology; oxidative stress and signaling markers\",\n      \"pmids\": [\"38460132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab finding awaiting independent replication\", \"Whether iron overload in AgRP neurons occurs in human metabolic disease not established\", \"Mechanism by which iron-induced SOCS3 attenuates leptin signaling in AgRP neurons not fully dissected\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include: the structural basis for AGRP's inverse agonism versus antagonism at MC4R at atomic resolution; whether distinct AgRP neuron subpopulations mediate feeding, energy expenditure, glucose regulation, and bone metabolism through segregated circuits; and how the numerous transcriptional, epigenetic, and metabolic sensing mechanisms are integrated within individual AgRP neurons to generate coordinated outputs.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution cryo-EM structure of AGRP bound to MC4R\", \"Single-cell resolution mapping of AgRP neuron functional subtypes incomplete\", \"Integrative computational model of AgRP neuron intracellular signaling not yet developed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 24, 25]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [13, 24, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [14, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 13, 24, 25]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 2, 5, 6, 7, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MC4R\", \"MC3R\", \"NPY\", \"FOXO1\", \"STAT3\", \"MRAP2\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"AGRP is a hypothalamic neuropeptide released from arcuate nucleus neurons that functions as a potent inverse agonist and antagonist of melanocortin receptors MC3R and MC4R, serving as a central orexigenic signal that drives feeding, modulates energy expenditure, and regulates glucose homeostasis [PMID:9311920, PMID:16820227, PMID:21364278]. Its C-terminal inhibitor cystine knot (ICK) domain—the first identified in a mammalian protein—is sufficient for receptor binding, with the Arg-Phe-Phe triplet engaging MC4R extracellular loops 2/3, while AGRP additionally promotes β-arrestin-mediated MC3R/MC4R endocytosis to reduce cell-surface receptor availability [PMID:11747427, PMID:10318826, PMID:17041250]. AgRP neuron activity is regulated by converging metabolic signals—leptin suppresses Agrp transcription via FoxO1–Stat3 opposition and TET3-mediated 5-hydroxymethylcytosine deposition at the Agrp promoter, ghrelin activates expression via GHSR–CaMK1D–CREB signaling, and fasting drives AMPK–PAK-dependent spinogenesis that increases excitatory synaptic input [PMID:16604086, PMID:36189793, PMID:37277610, PMID:27321921]. Beyond feeding, AgRP neurons control energy expenditure via a dorsal raphe MC4R–serotonin circuit, hepatic autophagy via an NPY–PVH–corticosterone axis, and counter-regulatory glucagon secretion through Agpat5-dependent glucose sensing [PMID:34112797, PMID:37075752, PMID:36180454].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"The identification of AGRP as an arcuate-restricted melanocortin receptor antagonist whose overexpression causes obesity established the gene as the hypothalamic counterpart of agouti signaling protein and a key mediator of leptin-regulated body weight.\",\n      \"evidence\": \"Recombinant protein pharmacology at MC3R/MC4R; transgenic overexpression in mice; in situ hybridization showing arcuate-specific expression elevated in ob/ob and db/db mice\",\n      \"pmids\": [\"9311920\", \"9119224\", \"9354787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous loss-of-function phenotype not yet tested\", \"Mechanism of selectivity for MC3R/MC4R over MC1R/MC2R unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Determination of the disulfide connectivity, NMR structure, and minimal active domain revealed that AGRP's C-terminal cystine knot fold—the first mammalian ICK protein—presents an Arg-Phe-Phe pharmacophore that engages MC4R extracellular loops 2 and 3, explaining receptor subtype selectivity.\",\n      \"evidence\": \"Biochemical disulfide mapping; NMR structures of AGRP(87-132) and minimized 34-residue domain; chimeric MC4R/MC1R binding assays; synthetic mutagenesis\",\n      \"pmids\": [\"9724530\", \"10371151\", \"9892020\", \"10318826\", \"11747427\", \"12056887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution AGRP–MC4R co-structure\", \"Role of the N-terminal pro-region in processing or signaling unclear\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstration that ghrelin activates arcuate NPY/AGRP neurons, and that antibody/antagonist blockade of AGRP abolishes ghrelin-induced feeding, placed AGRP downstream of the ghrelin–GHSR axis and upstream of MC4R in the orexigenic circuit.\",\n      \"evidence\": \"ICV ghrelin injection with Fos immunohistochemistry; antibody and antagonist blockade of NPY and AGRP in rats\",\n      \"pmids\": [\"11196643\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling cascade from GHSR to Agrp transcription not resolved\", \"Relative contributions of AGRP vs NPY vs GABA not dissected\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The discovery that AGRP is an inverse agonist (suppressing MC4R constitutive activity) and simultaneously an agonist of β-arrestin-mediated MC3R/MC4R endocytosis revealed dual mechanisms—active silencing and receptor removal—by which AGRP inhibits melanocortin signaling.\",\n      \"evidence\": \"Chimeric MC4R/MC1R mutagenesis with cAMP below-baseline readout; BRET for β-arrestin interaction; siRNA knockdown of β-arrestins with internalization assays\",\n      \"pmids\": [\"16820227\", \"17041250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution of endocytosis vs inverse agonism not separated\", \"Kinetics of receptor recycling after AGRP-driven internalization unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of FoxO1–Stat3 transcriptional opposition at the Agrp promoter provided the first molecular mechanism linking leptin receptor signaling to Agrp gene suppression, explaining how metabolic hormones regulate neuropeptide output at the transcriptional level.\",\n      \"evidence\": \"Adenoviral FoxO1 mutant delivery to arcuate nucleus; ChIP; promoter-reporter assays; in vivo food intake and gene expression\",\n      \"pmids\": [\"16604086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin remodeling cofactors at the Agrp locus incompletely characterized\", \"How insulin signaling intersects FoxO1 at the Agrp promoter not fully resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Bidirectional chemogenetic manipulation proved that AgRP neuron activity is both necessary and sufficient for feeding, while circuit-specific ablation/rescue experiments identified GABAergic output to the parabrachial nucleus—not AGRP peptide—as the signal preventing acute starvation.\",\n      \"evidence\": \"DREADD activation/inhibition in AgRP-Cre mice; diphtheria toxin ablation with chronic intra-PBN bretazenil rescue; MC4R antagonist inefficacy\",\n      \"pmids\": [\"21364278\", \"21211531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Temporal dynamics distinguishing GABA fast effects from AGRP peptide slow effects not fully delineated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that fasting activates AMPK in AgRP neurons, which phosphorylates PAK to drive spinogenesis, explained how metabolic state is translated into synaptic remodeling that increases excitatory input onto AgRP neurons.\",\n      \"evidence\": \"AgRP-specific AMPK manipulation; dendritic spine quantification; electrophysiology; AMPK substrate identification\",\n      \"pmids\": [\"27321921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PAK is the sole AMPK substrate for synaptogenesis not ruled out\", \"Presynaptic identity of new excitatory inputs not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Selective deletion of Npy (but not Agrp or GABA machinery) from AgRP neurons abolished sustained optogenetically-evoked feeding, establishing NPY—acting via Y1R for feeding and Y2R for energy expenditure—as the neuropeptide sustaining the long-lasting hunger drive.\",\n      \"evidence\": \"Conditional deletion of Npy, Agrp, or GABA capacity in AgRP neurons; optogenetic stimulation; Y1R/Y2R agonist rescue\",\n      \"pmids\": [\"31033437\", \"35167990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AGRP peptide functions on longer timescales (days) not excluded\", \"Circuit targets mediating Y2R energy expenditure effects incompletely mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Chemogenetic activation showed AgRP neurons rapidly shift whole-body substrate utilization toward carbohydrate oxidation and lipogenesis via fatty acid synthase, expanding their role beyond feeding to direct metabolic partitioning.\",\n      \"evidence\": \"Chemogenetic activation/ablation; indirect calorimetry; fatty acid synthase inhibitor pharmacology; pair-feeding\",\n      \"pmids\": [\"30659173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream neural pathways from AgRP neurons to peripheral lipogenic programs not traced\", \"Whether this is mediated by AGRP, NPY, or GABA not dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"TET3 was shown to dynamically produce 5-hydroxymethylcytosine at the Agrp promoter in response to leptin, recruiting a chromatin-modifying complex that represses Agrp transcription, providing a second epigenetic mechanism (complementing FoxO1-Stat3) for hormonal control of neuropeptide expression.\",\n      \"evidence\": \"CRISPR Tet3 KO in AgRP neurons; ChIP for TET3; 5hmC assay; chromatin complex analysis; metabolic phenotyping\",\n      \"pmids\": [\"36189793\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the recruited chromatin-modifying complex incompletely defined\", \"Relationship between TET3 and FoxO1 pathways not integrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Agpat5 in AgRP neurons was identified as the lipid-metabolic sensor linking hypoglycemia to glucagon secretion: its inactivation increased fatty acid oxidation and ATP, preventing the ATP decline that normally triggers neuronal firing, and Cpt1a inhibition rescued this defect.\",\n      \"evidence\": \"AgRP-specific Agpat5 conditional KO; vagal nerve recording; glucagon measurement; metabolic flux; Cpt1a inhibitor rescue\",\n      \"pmids\": [\"36180454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Agpat5 directly senses glucose or lipid flux not resolved\", \"Downstream autonomic pathways to pancreatic alpha cells not fully mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Multiple upstream activating pathways converging on AgRP neurons were mechanistically dissected: ghrelin signals through CaMK1D–CREB to drive AgRP/NPY expression in PVN projections, MC3R autocrine signaling is required for fasting/cold/ghrelin activation, asprosin acts via Ptprd to suppress SK3 K+ channels, and AgRP-to-PVH NPY controls hepatic autophagy through corticosterone.\",\n      \"evidence\": \"AgRP-specific conditional KOs of Camk1d, MC3R, SK3, and Ptprd; optogenetic/chemogenetic circuit manipulation; electrophysiology; hepatic autophagy assays\",\n      \"pmids\": [\"37277610\", \"37792535\", \"36812308\", \"37075752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How these parallel input pathways are integrated within single AgRP neurons is unknown\", \"Whether MC3R autocrine feedback involves AGRP peptide or other melanocortins not clarified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Iron-sensing via Tfrc and miR-33-dependent mitochondrial/fatty acid metabolism were identified as additional modulators of AgRP neuron activity and body weight, broadening the metabolic signals converging on these neurons.\",\n      \"evidence\": \"AgRP-specific Tfrc and miR-33 conditional KOs; electrophysiology; oxidative/ER stress markers; transcriptional profiling\",\n      \"pmids\": [\"38459068\", \"38460132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological conditions under which iron or miR-33 become rate-limiting for AgRP activity not established\", \"Both findings from single labs\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of the AGRP–MC4R complex remains unavailable, and how the multiple upstream signaling inputs (leptin, ghrelin, insulin, asprosin, iron, dopamine) are integrated at the single-neuron level to produce graded orexigenic output is unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No cryo-EM or crystal structure of AGRP bound to MC4R\", \"Single-cell integration logic of parallel metabolic inputs unknown\", \"In vivo contribution of AGRP inverse agonism vs β-arrestin-mediated endocytosis not separated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 2, 4, 15]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 2, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5, 15, 16]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [18, 19, 20, 32]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [28, 37]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"MC4R\",\n      \"MC3R\",\n      \"NPY\",\n      \"ARRB1\",\n      \"ARRB2\",\n      \"FOXO1\",\n      \"GHSR\",\n      \"CAMK1D\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}