{"gene":"ADIPOR1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2007,"finding":"Targeted disruption of AdipoR1 in mice abrogated adiponectin-induced AMPK activation, while simultaneous disruption of AdipoR1 and AdipoR2 abolished adiponectin binding entirely, demonstrating that AdipoR1 and AdipoR2 are the predominant in vivo receptors for adiponectin and that AdipoR1 specifically mediates AMPK activation.","method":"Adenovirus-mediated overexpression in Lepr(-/-) mice; targeted gene disruption (knockout mice); in vivo metabolic phenotyping","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 1-2 — loss-of-function knockout with defined molecular and metabolic phenotypes, replicated across receptor subtypes","pmids":["17268472"],"is_preprint":false},{"year":2010,"finding":"AdipoR1 mediates adiponectin-induced extracellular Ca2+ influx in myocytes, which activates CaMKKβ, AMPK, and SIRT1, leading to increased PGC-1α expression, decreased PGC-1α acetylation, and increased mitochondrial biogenesis; muscle-specific disruption of AdipoR1 suppressed all of these downstream events and caused insulin resistance and decreased exercise endurance.","method":"Muscle-specific AdipoR1 knockout mice; intracellular Ca2+ measurements; AMPK/SIRT1/PGC-1α western blotting; mitochondrial content assays; exercise endurance testing","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — conditional knockout with multiple orthogonal downstream readouts, published in high-impact journal","pmids":["20357764"],"is_preprint":false},{"year":2009,"finding":"AdipoR1 signals through LKB1 and AMPK to suppress hepatic SREBP1c expression, thereby regulating fatty acid synthesis; deletion of LKB1 abolished the adiponectin-mediated suppression of SREBP1c.","method":"siRNA knockdown of AdipoR1; LKB1-deleted hepatocytes; SREBP1c expression by western blot/qPCR in db/db mice and cultured hepatocytes","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis via genetic deletion and siRNA with defined molecular readout, single lab","pmids":["19254698"],"is_preprint":false},{"year":2008,"finding":"AdipoR1, but not AdipoR2, mediates adiponectin-induced anorexigenic signaling in the hypothalamus, activating IRS1/2, ERK, Akt, FOXO1, JAK2, and STAT3 to reduce food intake; inhibition of AdipoR1 completely reversed these effects.","method":"ICV adiponectin administration; AdipoR1/R2 receptor inhibition; phosphorylation of downstream signaling molecules by western blot; food intake measurement","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-specific inhibition with multiple signaling readouts and behavioral phenotype, single lab","pmids":["18394428"],"is_preprint":false},{"year":2010,"finding":"ERp46 (endoplasmic reticulum protein 46) interacts specifically with AdipoR1 (but not AdipoR2) through the cytoplasmic N-terminal residues (1-70) of AdipoR1; ERp46 knockdown increased AdipoR1 surface expression and enhanced adiponectin-stimulated AMPK phosphorylation while reducing p38MAPK phosphorylation.","method":"Co-immunoprecipitation followed by mass spectrometry; GST-fusion protein pull-down with truncation constructs; subcellular fractionation; indirect immunofluorescence; siRNA knockdown; AMPK/p38MAPK phosphorylation assays","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal Co-IP with MS identification, domain-mapping with truncation constructs, and functional consequence of knockdown, multiple orthogonal methods","pmids":["20074551"],"is_preprint":false},{"year":2011,"finding":"AdipoR1 mediates adiponectin signaling to suppress TNFα and MCP-1 expression and inhibit macrophage foam cell transformation, while APPL1 knockdown abrogated adiponectin's ability to inhibit lipid accumulation, SR-AI expression, NF-κB, and Akt phosphorylation in foam cells.","method":"Overexpression and siRNA knockdown of AdipoR1/AdipoR2; lentiviral shRNA knockdown of APPL1; oxLDL-induced foam cell transformation; cytokine gene expression; lipid accumulation assays","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-specific knockdown/overexpression with multiple functional and signaling readouts, single lab","pmids":["22227293"],"is_preprint":false},{"year":2008,"finding":"In renal distal tubules, adiponectin acts through luminal AdipoR1 (but not AdipoR2, which was not detected) to activate AMPK, leading to inhibition of glycogen synthase; in diabetic rats this regulation is disrupted, correlating with glycogen accumulation.","method":"Western blot of isolated distal tubules; immunohistochemistry; in vitro AICAR and globular adiponectin stimulation; AMPK and glycogen synthase activity assays in normal vs. STZ-diabetic rats","journal":"American journal of physiology. Renal physiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct receptor identification by immunohistochemistry with functional assay in isolated tubules, single lab","pmids":["18256313"],"is_preprint":false},{"year":2011,"finding":"Adiponectin increases MMP-3 expression in chondrocytes through AdipoR1 (not AdipoR2) by activating AMPK and p38, which leads to NF-κB activation on the MMP-3 promoter.","method":"AdipoR1/AdipoR2 siRNA knockdown; AMPK inhibitors (araA, compound C); p38 inhibitor (SB203580); NF-κB inhibitor; qPCR, western blot, and ELISA for MMP-3","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-specific knockdown with pathway inhibitor dissection, single lab","pmids":["21321996"],"is_preprint":false},{"year":2011,"finding":"Globular adiponectin protects cardiomyocytes (H9c2) from hypoxia/reoxygenation-induced apoptosis via AdipoR1/APPL1 signaling, reducing ROS production and caspase-3 activation; siRNA knockdown of either AdipoR1 or APPL1 abolished these protective effects.","method":"siRNA knockdown of AdipoR1 and APPL1; TUNEL labeling; annexin V; cytochrome c release; caspase-3 activity; ROS measurement","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — receptor and adaptor knockdown with multiple apoptosis readouts, single lab","pmids":["21552570"],"is_preprint":false},{"year":2009,"finding":"Adiponectin inhibits LPS-induced adventitial fibroblast migration and transformation to myofibroblasts via the AdipoR1–AMPK–iNOS pathway; siRNA knockdown of AdipoR1 or AMPK reversed adiponectin's inhibitory effects on NO/ONOO- production and fibroblast migration.","method":"AdipoR1 siRNA; AMPK siRNA; AMPK inhibitor; MTT, migration/scratch-wound assays; immunocytochemistry; RT-PCR; western blot; NO/ONOO- assays; adenovirus-adiponectin in ApoE-/- mice","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA epistasis with in vitro and in vivo validation, multiple readouts, single lab","pmids":["19889816"],"is_preprint":false},{"year":2011,"finding":"Globular adiponectin activates NF-κB and induces COX-2 overexpression in human aortic endothelial cells through AdipoR1; AdipoR1 siRNA abrogated NF-κB activation and COX-2 expression, while p38MAPK/VCAM-1 activation was AdipoR1-independent.","method":"AdipoR1 siRNA; NF-κB activation assay; COX-2/VCAM-1 expression by western blot; monocyte adhesion assay; prostacyclin ELISA","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-specific siRNA with dissection of AdipoR1-dependent vs. independent pathways, single lab","pmids":["21900123"],"is_preprint":false},{"year":2012,"finding":"Overexpression of AdipoR1 in rat skeletal muscle increased glucose uptake, glycogen accumulation, and AMPK/acetyl-CoA carboxylase phosphorylation, and reduced levels of specific ceramide species and ceramide synthetic enzyme mRNAs, demonstrating that enhanced AdipoR1 signaling is sufficient to improve local insulin sensitivity.","method":"In vivo electrotransfer-mediated AdipoR1 overexpression; hyperinsulinemic-euglycemic clamp; glucose uptake measurement; sphingolipid mass spectrometry; western blot of signaling molecules","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo gain-of-function with clamp physiology and lipidomics, single lab","pmids":["22989629"],"is_preprint":false},{"year":2013,"finding":"miR-221 and the RNA-binding protein PTB cooperatively bind the AdipoR1 3'UTR and inhibit AdipoR1 translation; depletion of PTB or miR-221 increased AdipoR1 protein synthesis, while overexpression decreased it. Both PTB and miR-221 are upregulated in obesity, providing a mechanism for reduced AdipoR1 protein in obese animals.","method":"RNA-immunoprecipitation; luciferase reporter assays with 3'UTR constructs; siRNA depletion and overexpression of PTB and miR-221; AdipoR1 protein quantification in muscle and liver cells; mouse models of obesity","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1-2 — RNA-IP, luciferase reporter validation, gain- and loss-of-function, replicated in multiple cell types and in vivo","pmids":["24130336"],"is_preprint":false},{"year":2014,"finding":"AdipoR1 deficiency in mice led to severe metabolic dysfunction (diet-induced obesity model), while AdipoR2 deficiency was protective from metabolic perturbations; conversely, AdipoR2 (not AdipoR1) was required for ischemia-induced revascularization and for adiponectin's pro-revascularization effects, revealing divergent in vivo roles.","method":"AdipoR1-/- and AdipoR2-/- mice; hind limb ischemia model; blood flow measurement; diet-induced obesity; metabolic phenotyping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — receptor-specific knockout in two distinct in vivo disease models with clear functional divergence","pmids":["24742672"],"is_preprint":false},{"year":2015,"finding":"AdipoR1 (but not AdipoR2) depletion abolished the protective effects of the AdipoR1 agonist GTDF on osteoblasts, and AdipoR1 agonism restored osteopenia in diabetic mice by upregulating PGC-1α in osteoblasts; AdipoR1 deficiency in bone is a key mediator of diabetes-associated skeletal pathology.","method":"AdipoR1 siRNA; AdipoR1 agonist GTDF treatment; PGC-1α expression; db/db mouse model; bone mass measurements (µCT); osteoblast apoptosis assays","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-specific knockdown with in vivo pharmacological rescue, single lab","pmids":["25633418"],"is_preprint":false},{"year":2015,"finding":"IPo (ischemic postconditioning) activates mitochondrial STAT3 through APN/AdipoR1/Caveolin-3 pathway to confer cardioprotection; specific AdipoR1 gene knockdown or Cav3 disruption abolished hypoxic postconditioning-induced protection, demonstrating that AdipoR1 forms a functional complex with Cav3 to transduce adiponectin cardioprotective signaling.","method":"AdipoR1 siRNA knockdown; Cav3 disruption; APN knockout mice; coronary occlusion/reperfusion model; mitochondrial STAT3 activation; mitochondrial function assays","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 — receptor knockdown and KO with functional cardiac readouts, single lab","pmids":["26718505"],"is_preprint":false},{"year":2016,"finding":"A heterozygous missense mutation in ADIPOR1 (p.Y310C) causes autosomal dominant retinitis pigmentosa; the mutation affects protein folding and subcellular localization in vitro, and morpholino knockdown of adipor1 in zebrafish specifically reduced rod photoreceptor numbers, a phenotype partially rescued by wild-type but not mutant human ADIPOR1 mRNA.","method":"Exome sequencing; in vitro protein folding/localization assays; zebrafish morpholino knockdown; morphant rescue with wild-type vs. mutant ADIPOR1 mRNA","journal":"Human genetics","confidence":"High","confidence_rationale":"Tier 1-2 — disease mutation functionally validated by in vitro structural assays and in vivo rescue experiment in zebrafish","pmids":["27655171"],"is_preprint":false},{"year":2016,"finding":"ADIPOR1 is mutated (frameshift c.31delC) in a syndromic retinitis pigmentosa case, and ADIPOR1 protein is expressed in the retina; Adipor1-null mice exhibit retinal dystrophy, supporting ADIPOR1 as a disease-causing gene for syndromic RP.","method":"Whole-exome sequencing; immunohistochemistry of retinal tissue; Adipor1-null mouse phenotype","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 — human mutation with confirmatory IHC and mouse model, single study","pmids":["26662040"],"is_preprint":false},{"year":2018,"finding":"AdipoR1 is expressed in dorsal raphe nucleus serotonin (5-HT) neurons; selective deletion of AdipoR1 in 5-HT neurons decreased TPH2 expression and 5-HT immunoreactivity, upregulated SERT, and induced anhedonia and behavioral despair in a sex-dependent manner, establishing AdipoR1 as a regulator of serotonergic neurotransmission and depression-related behavior.","method":"Conditional (cell-type-specific) AdipoR1 knockout in 5-HT neurons; immunofluorescence for TPH2/SERT; behavioral tests (sucrose preference, saccharin preference, FST); fluoxetine vs. desipramine pharmacological dissection","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with molecular (TPH2, SERT) and behavioral phenotypes plus pharmacological validation","pmids":["31980728"],"is_preprint":false},{"year":2018,"finding":"AdipoR1 is expressed on VTA dopamine neurons; intra-VTA infusion of adiponectin decreases basal dopamine neuron firing and reverses stress-induced dopamine activity and anxiety, and these effects are abolished in mice lacking AdipoR1 specifically in dopamine neurons.","method":"Conditional AdipoR1 knockout in dopamine neurons; electrophysiology (population activity, firing rate); intra-VTA infusion; anxiety behavioral tests; adiponectin haploinsufficiency","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with electrophysiological and behavioral readouts confirming AdipoR1 necessity","pmids":["29988086"],"is_preprint":false},{"year":2018,"finding":"Adiponectin attenuates neuronal apoptosis after neonatal hypoxia-ischemia via sequential activation of AdipoR1→APPL1→LKB1→AMPK; siRNA knockdown of any component (AdipoR1, APPL1, or LKB1) abolished the anti-apoptotic effects of recombinant adiponectin.","method":"AdipoR1, APPL1, and LKB1 siRNA (intracerebroventricular); intranasal rh-Adiponectin administration; brain infarct measurement; TUNEL; western blot of pathway components; neurological function testing","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — multi-step epistasis via sequential siRNA knockdowns with in vivo functional readouts, single lab","pmids":["29486166"],"is_preprint":false},{"year":2019,"finding":"AdipoR1 and AdipoR2 are essential for maintaining membrane phospholipid unsaturation and membrane fluidity in most human cell types, independently of adiponectin; loss of AdipoRs causes membrane rigidification when cells are challenged with saturated fatty acids, demonstrating a ligand-independent membrane homeostasis function.","method":"AdipoR1/AdipoR2 double knockout; FRAP; Laurdan dye generalized polarization; phospholipid fatty acid composition by mass spectrometry; palmitate challenge; primary HUVECs and multiple human cell lines","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1-2 — three independent biophysical methods with genetic KO across multiple cell types, single study","pmids":["30890562"],"is_preprint":false},{"year":2019,"finding":"AdipoR1 knockdown in BV2 microglia abolished adiponectin's ability to suppress AβO-induced TNFα and IL-1β release and AMPK phosphorylation, and prevented NF-κB nuclear translocation, placing AdipoR1 upstream of AMPK→NF-κB in the anti-neuroinflammatory pathway.","method":"AdipoR1/AdipoR2 siRNA in BV2 cells; AMPK inhibitor (Compound C); cytokine ELISA; AMPK phosphorylation by western blot; NF-κB nuclear translocation; APN-/-5xFAD mice neuroinflammation assessment","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-specific siRNA with pharmacological AMPK inhibition and in vivo validation, single lab","pmids":["31128596"],"is_preprint":false},{"year":2020,"finding":"Crystal structure of a D208A variant AdipoR1 revealed both 'closed' and 'open' conformations, with helices IV and V shifting ~4-11 Å at intracellular ends between states; reanalysis of wild-type AdipoR1 diffraction data also showed a 44:56 mixture of closed and open forms, suggesting conformational switching is relevant to receptor function.","method":"X-ray crystallography of D208A AdipoR1 variant; structural comparison with wild-type; reanalysis of wild-type diffraction data","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis and conformational analysis","pmids":["32796916"],"is_preprint":false},{"year":2022,"finding":"AdipoR1 possesses intrinsic ceramidase activity; AdipoR1 knockout in mice causes ceramide accumulation in the retina leading to photoreceptor degeneration, and pharmacological inhibition of ceramide generation (desipramine/L-cycloserine) rescued photoreceptor survival and improved visual function in AdipoR1-/- mice.","method":"AdipoR1-/- mice; single-cell RNA-seq; ceramide quantification by lipidomics; ERG; pharmacological rescue with desipramine/L-cycloserine; primary visual cortex electrophysiology","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1-2 — enzymatic function (ceramidase) established with KO lipidomics, single-cell transcriptomics, pharmacological rescue, and multiple functional visual readouts","pmids":["35015730"],"is_preprint":false},{"year":2021,"finding":"ADIPOR1 deficiency in mice suppresses retinal ELOVL2 expression and reduces docosahexaenoic acid (DHA) levels in photoreceptor outer segment membranes prior to cell death, and this causal relationship between ADIPOR1 and ELOVL2 repression was confirmed in vitro, establishing ADIPOR1 as required for DHA supply to photoreceptors.","method":"Adipor1 KO mice; ERG; lipid composition analysis; gene expression (RT-qPCR, microarray); in vitro ADIPOR1 depletion confirming ELOVL2 regulation; electron microscopy of outer segments","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KO with lipidomics and in vitro confirmation of ELOVL2 regulation, single lab","pmids":["33963174"],"is_preprint":false},{"year":2018,"finding":"Post-developmental conditional knockout of AdipoR1 specifically in photoreceptors or the RPE caused decreased retinal protein expression and visual dysfunction, and loss of AdipoR1 in the RPE alone (as in the Mfrprd6 mouse) is sufficient to drive retinal degeneration.","method":"Conditional (photoreceptor- and RPE-specific) AdipoR1 knockout; ERG; immunohistochemistry; Mfrprd6 mouse ADIPOR1 expression analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with functional visual phenotype, linkage to disease model","pmids":["30254279"],"is_preprint":false},{"year":2020,"finding":"AdipoR1 is required for adiponectin receptor agonist (AdipoRon) signaling to AMPK in the context of Alzheimer's disease; both AdipoR1 silencing and AMPK inhibition (compound C) reversed AdipoRon-mediated neural stem cell proliferation and cognitive improvement in APP/PS1 mice.","method":"AdipoR1 siRNA; AMPK inhibitor; in vivo APP/PS1 transgenic mice; Morris water maze; BrdU/Ki67 staining for NSC proliferation; BACE1/Aβ quantification","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA and pharmacological inhibitor epistasis in vitro and in vivo, single lab","pmids":["32070713"],"is_preprint":false},{"year":2015,"finding":"High glucose/high lipid conditions dissociate the AdipoR1/Caveolin-1 (Cav1) signaling complex in endothelial cells by reducing Cav1 expression; Cav1 knockdown impaired adiponectin's anti-oxidative and anti-inflammatory actions, while Cav1 overexpression preserved APN signaling. A mutated Cav1 scaffolding domain restored caveolae structure but not APN signaling, demonstrating the AdipoR1/Cav1 interaction is critical for adiponectin vascular signaling.","method":"Co-immunoprecipitation; Cav1 siRNA and overexpression; mutant Cav1 knock-in; eNOS/AMPK/Akt phosphorylation; NO measurement; diabetic vascular tissue analysis","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, mutagenesis, gain/loss-of-function with functional signaling readouts, single lab","pmids":["26453924"],"is_preprint":false},{"year":2020,"finding":"AdipoR1 conditional knockout in CD4+ T cells inhibited Th17 cell differentiation by reducing HIF-1α expression and glycolysis, and AdipoR1-deficient mice showed ameliorated joint inflammation in antigen-induced arthritis, identifying AdipoR1 as a regulator of Th17 differentiation via HIF-1α-dependent metabolic reprogramming.","method":"T cell lineage AdipoR1 conditional KO; RNA-seq; Th17 differentiation assay in vitro; antigen-induced arthritis mouse model; HIF-1α/glycolysis metabolic measurements","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with RNA-seq and in vivo arthritis model, single lab","pmids":["32973810"],"is_preprint":false},{"year":2022,"finding":"AdipoR1 directly targets and stabilizes Nrf2 protein in hepatocellular carcinoma cells after ionizing radiation; AdipoR1 knockdown suppressed Nrf2 and its target xCT, increasing ferroptosis after radiation, while rescue of Nrf2 or xCT reversed this effect, establishing an AdipoR1-Nrf2-xCT axis in radiation-induced ferroptosis.","method":"AdipoR1 siRNA knockdown; Nrf2/xCT western blot; ChIP for Nrf2 on xCT promoter; ferroptosis/cell death assays; erastin treatment; Nrf2/xCT rescue overexpression","journal":"Oxidative medicine and cellular longevity","confidence":"Medium","confidence_rationale":"Tier 2 — knockdown with ChIP and rescue experiments establishing pathway order, single lab","pmids":["35733794"],"is_preprint":false},{"year":2022,"finding":"AdipoR1 ubiquitination is induced by LPS+ATP in vitro, and Schisandrin A directly targets AdipoR1 protein to reduce this ubiquitination and activate AdipoR1/AMPK signaling, suppressing ferroptosis and NLRP3-mediated pyroptosis in diabetic nephropathy models.","method":"Direct binding assay; ubiquitination assay; AdipoR1/AMPK/TXNIP/NLRP3 pathway western blot; in vivo STZ/high-fat diabetic model","journal":"Oxidative medicine and cellular longevity","confidence":"Low","confidence_rationale":"Tier 3 — direct binding and ubiquitination assays without detailed mechanistic reconstitution, single lab","pmids":["35996380"],"is_preprint":false}],"current_model":"ADIPOR1 is a seven-transmembrane receptor with an intracellular N-terminus that functions as the primary adiponectin receptor in muscle and brain; upon ligand binding it induces Ca2+ influx to activate CaMKKβ→AMPK→SIRT1→PGC-1α (increasing mitochondrial biogenesis), signals through APPL1→LKB1→AMPK to suppress gluconeogenesis and SREBP1c, and regulates membrane phospholipid composition/fluidity via intrinsic ceramidase activity—particularly critical in retinal photoreceptors where it maintains DHA levels and ELOVL2 expression for photoreceptor survival. It also modulates NF-κB, p38MAPK, HIF-1α, and Nrf2 pathways in a cell-type-specific manner, and its surface availability is regulated post-translationally by ERp46 interaction (at its cytoplasmic N-terminus) and translationally by miR-221/PTB. The receptor undergoes closed-to-open conformational transitions (established by X-ray crystallography) and can form functional complexes with Caveolin-1 and Caveolin-3 for cardiovascular signaling."},"narrative":{"teleology":[{"year":2007,"claim":"Establishing that ADIPOR1 and ADIPOR2 are the principal in vivo adiponectin receptors — and that ADIPOR1 specifically mediates AMPK activation — resolved the long-standing question of receptor identity for adiponectin signaling.","evidence":"Targeted gene disruption (single and double KO mice) with metabolic phenotyping and adiponectin binding assays","pmids":["17268472"],"confidence":"High","gaps":["Mechanism by which ADIPOR1 selectively activates AMPK over other kinases was not defined","Ligand-independent functions not addressed"]},{"year":2008,"claim":"Demonstrating AdipoR1-dependent signaling in hypothalamus (anorexigenic) and renal tubules (glycogen synthase inhibition) extended the receptor's functional reach beyond skeletal muscle and liver to brain and kidney.","evidence":"ICV adiponectin with receptor inhibition and behavioral/signaling readouts; immunohistochemistry and AMPK activity assays in isolated renal tubules","pmids":["18394428","18256313"],"confidence":"Medium","gaps":["Receptor subtype specificity relied on pharmacological inhibition rather than genetic deletion in the hypothalamic study","Downstream mediators linking AMPK to behavioral output not identified"]},{"year":2009,"claim":"Identification of LKB1 as a required intermediate between ADIPOR1 and AMPK-mediated SREBP1c suppression, and of the ADIPOR1–AMPK–iNOS axis in fibroblast migration, established branching downstream pathway architecture.","evidence":"LKB1-deleted hepatocytes and AdipoR1/AMPK siRNA in fibroblasts with epistasis analysis","pmids":["19254698","19889816"],"confidence":"Medium","gaps":["Whether LKB1 vs. CaMKKβ dominance is tissue-specific was not resolved","Direct physical interaction between ADIPOR1 and LKB1 not shown"]},{"year":2010,"claim":"The discovery that ADIPOR1 triggers extracellular Ca²⁺ influx to activate CaMKKβ→AMPK→SIRT1→PGC-1α, driving mitochondrial biogenesis and exercise endurance, defined the core muscle signaling cascade and its physiological consequences.","evidence":"Muscle-specific AdipoR1 conditional KO with Ca²⁺ measurements, SIRT1/PGC-1α acetylation assays, mitochondrial content, and exercise testing","pmids":["20357764"],"confidence":"High","gaps":["Ion channel mediating Ca²⁺ influx not identified","Whether this cascade operates identically in human muscle unknown"]},{"year":2010,"claim":"Identification of ERp46 as a physical interactor that retains ADIPOR1 intracellularly through binding to its N-terminal cytoplasmic domain revealed the first post-translational mechanism controlling receptor surface expression.","evidence":"Reciprocal Co-IP with MS, GST pull-down with truncation mapping, siRNA knockdown showing increased surface ADIPOR1 and enhanced AMPK signaling","pmids":["20074551"],"confidence":"High","gaps":["Whether ERp46 acts as a chaperone or quality-control factor was not distinguished","Regulation of the ERp46–ADIPOR1 interaction under physiological stimuli not explored"]},{"year":2011,"claim":"Multiple studies established ADIPOR1 as an upstream activator of NF-κB in both pro-inflammatory (endothelial COX-2, chondrocyte MMP-3) and anti-inflammatory (macrophage foam cell suppression via APPL1) contexts, revealing cell-type-dependent pathway utilization.","evidence":"AdipoR1 siRNA in endothelial cells, chondrocytes, and macrophages with NF-κB, COX-2, MMP-3, and cytokine readouts; APPL1 shRNA epistasis","pmids":["21900123","21321996","22227293"],"confidence":"Medium","gaps":["Mechanism determining whether ADIPOR1–NF-κB signaling is pro- or anti-inflammatory in a given cell type unknown","APPL1 binding site on ADIPOR1 not mapped"]},{"year":2013,"claim":"The finding that miR-221 and PTB cooperatively repress ADIPOR1 translation via its 3′UTR — both being upregulated in obesity — provided a molecular explanation for reduced ADIPOR1 protein in metabolic disease.","evidence":"RNA-IP, luciferase 3′UTR reporters, gain- and loss-of-function in multiple cell types and obese mouse models","pmids":["24130336"],"confidence":"High","gaps":["Whether therapeutic targeting of miR-221/PTB restores ADIPOR1 levels and metabolic function in vivo not tested","Other post-transcriptional regulators not surveyed"]},{"year":2015,"claim":"Demonstration that ADIPOR1 forms functional signaling complexes with Caveolin-1 (endothelial) and Caveolin-3 (cardiomyocyte) — required for anti-oxidative, anti-inflammatory, and cardioprotective actions — established caveolae as critical signaling platforms for ADIPOR1.","evidence":"Co-IP, Cav1/Cav3 knockdown/overexpression and mutant Cav1 knock-in with eNOS/AMPK/STAT3 readouts; APN-KO ischemia/reperfusion model","pmids":["26453924","26718505"],"confidence":"Medium","gaps":["Direct structural basis for ADIPOR1–caveolin interaction not determined","Whether caveolar localization affects ceramidase activity unknown"]},{"year":2016,"claim":"Identification of ADIPOR1 mutations (p.Y310C and c.31delC) as causes of retinitis pigmentosa, validated by in vitro protein misfolding and zebrafish rescue experiments, established ADIPOR1 as a retinal disease gene.","evidence":"Exome sequencing of RP families; in vitro folding/localization of mutant protein; zebrafish morpholino knockdown rescued by WT but not mutant ADIPOR1; Adipor1-null mouse retinal dystrophy","pmids":["27655171","26662040"],"confidence":"High","gaps":["Full allelic spectrum of ADIPOR1-associated retinal disease not defined","Whether ceramidase loss alone explains photoreceptor death from these mutations not determined at this point"]},{"year":2018,"claim":"Cell-type-specific conditional knockouts in serotonergic and dopaminergic neurons demonstrated that ADIPOR1 is a non-redundant regulator of neurotransmitter synthesis and neuronal excitability, with loss producing depression- and anxiety-related behaviors.","evidence":"Conditional KO in 5-HT (Pet1-Cre) and DA (DAT-Cre) neurons; TPH2/SERT expression; electrophysiology of VTA DA neurons; behavioral testing with pharmacological dissection","pmids":["31980728","29988086"],"confidence":"High","gaps":["Downstream signaling pathway from ADIPOR1 to TPH2 transcription not mapped","Whether adiponectin or a different ligand activates neuronal ADIPOR1 in vivo not established"]},{"year":2019,"claim":"Demonstrating that ADIPOR1/R2 double-knockout cells exhibit membrane rigidification upon saturated fatty acid challenge — independent of adiponectin — revealed a ligand-independent membrane homeostasis function for the receptor.","evidence":"ADIPOR1/R2 DKO in HUVECs and multiple cell lines; FRAP, Laurdan dye, phospholipid mass spectrometry under palmitate challenge","pmids":["30890562"],"confidence":"High","gaps":["Relative contributions of ADIPOR1 vs. ADIPOR2 to membrane fluidity maintenance not separated","Whether this function requires ceramidase activity specifically not tested"]},{"year":2020,"claim":"Crystallographic resolution of closed-to-open conformational transitions in ADIPOR1 (helices IV and V shifting 4–11 Å) provided the first structural framework for understanding how receptor activation propagates signal to the intracellular domain.","evidence":"X-ray crystallography of D208A variant and reanalysis of wild-type diffraction data revealing 44:56 closed:open equilibrium","pmids":["32796916"],"confidence":"High","gaps":["Ligand-bound structure not captured; whether adiponectin binding shifts the conformational equilibrium is inferred but not proven","How conformational change couples to AMPK activation or ceramidase activity not established"]},{"year":2022,"claim":"Establishing that ADIPOR1 possesses intrinsic ceramidase activity — whose loss causes ceramide accumulation and photoreceptor degeneration rescuable by ceramide synthesis inhibitors — unified the retinal disease phenotype with a specific enzymatic mechanism.","evidence":"ADIPOR1-KO mice; retinal ceramide quantification by lipidomics; ERG and primary visual cortex electrophysiology; pharmacological rescue with desipramine/L-cycloserine","pmids":["35015730"],"confidence":"High","gaps":["Kinetic parameters and substrate specificity of ADIPOR1 ceramidase activity not characterized biochemically with purified protein","Whether ceramidase activity is regulated by adiponectin binding or conformational state not determined"]},{"year":null,"claim":"Key unresolved questions include: how adiponectin binding couples to the closed-to-open conformational switch and ceramidase activation; the identity of the Ca²⁺ channel mediating ADIPOR1-dependent Ca²⁺ influx; and whether neuronal ADIPOR1 functions are adiponectin-dependent or involve alternative ligands or ligand-independent mechanisms.","evidence":"","pmids":[],"confidence":"Low","gaps":["No ligand-bound ADIPOR1 structure available","Ca²⁺ channel identity unknown","Neuronal ligand identity uncertain","Ceramidase kinetics with purified protein not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[24]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[21,24,25]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,16,28]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,11,21,24,25]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22,29]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[18,19]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,20,30]}],"complexes":["AdipoR1/Caveolin-1 complex","AdipoR1/Caveolin-3 complex"],"partners":["APPL1","ERP46","CAV1","CAV3","LKB1","ADIPOQ","ADIPOR2"],"other_free_text":[]},"mechanistic_narrative":"ADIPOR1 is a seven-transmembrane adiponectin receptor that functions as a central metabolic sensor coupling adiponectin signaling to AMPK activation, mitochondrial biogenesis, lipid homeostasis, and anti-inflammatory responses across diverse tissues including skeletal muscle, liver, brain, retina, and immune cells. Upon adiponectin binding, ADIPOR1 induces extracellular Ca²⁺ influx to activate CaMKKβ→AMPK→SIRT1→PGC-1α signaling, promoting mitochondrial content and exercise capacity, and signals through APPL1→LKB1→AMPK to suppress hepatic gluconeogenesis and SREBP1c-driven lipogenesis [PMID:20357764, PMID:19254698, PMID:17268472]. ADIPOR1 also possesses intrinsic ceramidase activity essential for maintaining membrane phospholipid unsaturation and DHA levels in photoreceptor outer segments; loss of this activity causes ceramide accumulation and retinal degeneration, and heterozygous or homozygous ADIPOR1 mutations cause retinitis pigmentosa in humans [PMID:35015730, PMID:30890562, PMID:27655171, PMID:26662040]. In the brain, cell-type-specific ADIPOR1 deletion in serotonergic or dopaminergic neurons disrupts neurotransmitter homeostasis and produces depression- and anxiety-related phenotypes, while its surface availability is regulated post-translationally by ERp46 retention and translationally by miR-221/PTB-mediated repression [PMID:31980728, PMID:29988086, PMID:20074551, PMID:24130336]."},"prefetch_data":{"uniprot":{"accession":"Q96A54","full_name":"Adiponectin receptor protein 1","aliases":["Progestin and adipoQ receptor family member 1","Progestin and adipoQ receptor family member I"],"length_aa":375,"mass_kda":42.6,"function":"Receptor for ADIPOQ, an essential hormone secreted by adipocytes that regulates glucose and lipid metabolism (PubMed:12802337, PubMed:25855295). Required for normal glucose and fat homeostasis and for maintaining a normal body weight. ADIPOQ-binding activates a signaling cascade that leads to increased AMPK activity, and ultimately to increased fatty acid oxidation, increased glucose uptake and decreased gluconeogenesis. Has high affinity for globular adiponectin and low affinity for full-length adiponectin (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q96A54/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADIPOR1","classification":"Not Classified","n_dependent_lines":11,"n_total_lines":1208,"dependency_fraction":0.009105960264900662},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ADIPOR1","total_profiled":1310},"omim":[{"mim_id":"615603","title":"CALCINEURIN-LIKE PHOSPHOESTERASE DOMAIN-CONTAINING PROTEIN 1; CPPED1","url":"https://www.omim.org/entry/615603"},{"mim_id":"614581","title":"MONOCYTE-TO-MACROPHAGE DIFFERENTIATION-ASSOCIATED PROTEIN 2; MMD2","url":"https://www.omim.org/entry/614581"},{"mim_id":"614580","title":"PROGESTIN AND ADIPOQ RECEPTOR FAMILY, MEMBER 9; PAQR9","url":"https://www.omim.org/entry/614580"},{"mim_id":"614579","title":"PROGESTIN AND ADIPOQ RECEPTOR FAMILY, MEMBER 6; PAQR6","url":"https://www.omim.org/entry/614579"},{"mim_id":"614578","title":"PROGESTIN AND ADIPOQ RECEPTOR FAMILY, MEMBER 4; PAQR4","url":"https://www.omim.org/entry/614578"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ADIPOR1"},"hgnc":{"alias_symbol":["PAQR1","ACDCR1"],"prev_symbol":[]},"alphafold":{"accession":"Q96A54","domains":[{"cath_id":"1.20.1070","chopping":"120-364","consensus_level":"high","plddt":95.6035,"start":120,"end":364}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96A54","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96A54-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96A54-F1-predicted_aligned_error_v6.png","plddt_mean":83.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADIPOR1","jax_strain_url":"https://www.jax.org/strain/search?query=ADIPOR1"},"sequence":{"accession":"Q96A54","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96A54.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96A54/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96A54"}},"corpus_meta":[{"pmid":"17268472","id":"PMC_17268472","title":"Targeted disruption 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N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/31401413","citation_count":20,"is_preprint":false},{"pmid":"23656997","id":"PMC_23656997","title":"Single-nucleotide polymorphisms in adiponectin, AdipoR1, and AdipoR2 genes: insulin resistance and type 2 diabetes mellitus candidate genes.","date":"2013","source":"American journal of therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/23656997","citation_count":19,"is_preprint":false},{"pmid":"35189329","id":"PMC_35189329","title":"Molecular modeling, mutational analysis and steroid specificity of the ligand binding pocket of mPRα (PAQR7): Shared ligand binding with AdipoR1 and its structural basis.","date":"2022","source":"The Journal of steroid biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/35189329","citation_count":19,"is_preprint":false},{"pmid":"33396129","id":"PMC_33396129","title":"LncRNA loc105377478 promotes NPs-Nd2O3-induced inflammation in human bronchial epithelial cells through the ADIPOR1/NF-κB 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official journal of the American Society for Bariatric Surgery","url":"https://pubmed.ncbi.nlm.nih.gov/29960867","citation_count":17,"is_preprint":false},{"pmid":"34925690","id":"PMC_34925690","title":"Activation of AdipoR1 with rCTRP9 Preserves BBB Integrity through the APPL1/AMPK/Nrf2 Signaling Pathway in ICH Mice.","date":"2021","source":"Oxidative medicine and cellular longevity","url":"https://pubmed.ncbi.nlm.nih.gov/34925690","citation_count":17,"is_preprint":false},{"pmid":"19196212","id":"PMC_19196212","title":"Adiponectin induced placental cell apoptosis could be mediated via the ADIPOR1-receptor in pre-eclampsia with IUGR.","date":"2009","source":"Journal of perinatal 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(knockout mice); in vivo metabolic phenotyping\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — loss-of-function knockout with defined molecular and metabolic phenotypes, replicated across receptor subtypes\",\n      \"pmids\": [\"17268472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AdipoR1 mediates adiponectin-induced extracellular Ca2+ influx in myocytes, which activates CaMKKβ, AMPK, and SIRT1, leading to increased PGC-1α expression, decreased PGC-1α acetylation, and increased mitochondrial biogenesis; muscle-specific disruption of AdipoR1 suppressed all of these downstream events and caused insulin resistance and decreased exercise endurance.\",\n      \"method\": \"Muscle-specific AdipoR1 knockout mice; intracellular Ca2+ measurements; AMPK/SIRT1/PGC-1α western blotting; mitochondrial content assays; exercise endurance testing\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional knockout with multiple orthogonal downstream readouts, published in high-impact journal\",\n      \"pmids\": [\"20357764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AdipoR1 signals through LKB1 and AMPK to suppress hepatic SREBP1c expression, thereby regulating fatty acid synthesis; deletion of LKB1 abolished the adiponectin-mediated suppression of SREBP1c.\",\n      \"method\": \"siRNA knockdown of AdipoR1; LKB1-deleted hepatocytes; SREBP1c expression by western blot/qPCR in db/db mice and cultured hepatocytes\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via genetic deletion and siRNA with defined molecular readout, single lab\",\n      \"pmids\": [\"19254698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AdipoR1, but not AdipoR2, mediates adiponectin-induced anorexigenic signaling in the hypothalamus, activating IRS1/2, ERK, Akt, FOXO1, JAK2, and STAT3 to reduce food intake; inhibition of AdipoR1 completely reversed these effects.\",\n      \"method\": \"ICV adiponectin administration; AdipoR1/R2 receptor inhibition; phosphorylation of downstream signaling molecules by western blot; food intake measurement\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific inhibition with multiple signaling readouts and behavioral phenotype, single lab\",\n      \"pmids\": [\"18394428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ERp46 (endoplasmic reticulum protein 46) interacts specifically with AdipoR1 (but not AdipoR2) through the cytoplasmic N-terminal residues (1-70) of AdipoR1; ERp46 knockdown increased AdipoR1 surface expression and enhanced adiponectin-stimulated AMPK phosphorylation while reducing p38MAPK phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation followed by mass spectrometry; GST-fusion protein pull-down with truncation constructs; subcellular fractionation; indirect immunofluorescence; siRNA knockdown; AMPK/p38MAPK phosphorylation assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal Co-IP with MS identification, domain-mapping with truncation constructs, and functional consequence of knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"20074551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AdipoR1 mediates adiponectin signaling to suppress TNFα and MCP-1 expression and inhibit macrophage foam cell transformation, while APPL1 knockdown abrogated adiponectin's ability to inhibit lipid accumulation, SR-AI expression, NF-κB, and Akt phosphorylation in foam cells.\",\n      \"method\": \"Overexpression and siRNA knockdown of AdipoR1/AdipoR2; lentiviral shRNA knockdown of APPL1; oxLDL-induced foam cell transformation; cytokine gene expression; lipid accumulation assays\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific knockdown/overexpression with multiple functional and signaling readouts, single lab\",\n      \"pmids\": [\"22227293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In renal distal tubules, adiponectin acts through luminal AdipoR1 (but not AdipoR2, which was not detected) to activate AMPK, leading to inhibition of glycogen synthase; in diabetic rats this regulation is disrupted, correlating with glycogen accumulation.\",\n      \"method\": \"Western blot of isolated distal tubules; immunohistochemistry; in vitro AICAR and globular adiponectin stimulation; AMPK and glycogen synthase activity assays in normal vs. STZ-diabetic rats\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct receptor identification by immunohistochemistry with functional assay in isolated tubules, single lab\",\n      \"pmids\": [\"18256313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Adiponectin increases MMP-3 expression in chondrocytes through AdipoR1 (not AdipoR2) by activating AMPK and p38, which leads to NF-κB activation on the MMP-3 promoter.\",\n      \"method\": \"AdipoR1/AdipoR2 siRNA knockdown; AMPK inhibitors (araA, compound C); p38 inhibitor (SB203580); NF-κB inhibitor; qPCR, western blot, and ELISA for MMP-3\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific knockdown with pathway inhibitor dissection, single lab\",\n      \"pmids\": [\"21321996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Globular adiponectin protects cardiomyocytes (H9c2) from hypoxia/reoxygenation-induced apoptosis via AdipoR1/APPL1 signaling, reducing ROS production and caspase-3 activation; siRNA knockdown of either AdipoR1 or APPL1 abolished these protective effects.\",\n      \"method\": \"siRNA knockdown of AdipoR1 and APPL1; TUNEL labeling; annexin V; cytochrome c release; caspase-3 activity; ROS measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor and adaptor knockdown with multiple apoptosis readouts, single lab\",\n      \"pmids\": [\"21552570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Adiponectin inhibits LPS-induced adventitial fibroblast migration and transformation to myofibroblasts via the AdipoR1–AMPK–iNOS pathway; siRNA knockdown of AdipoR1 or AMPK reversed adiponectin's inhibitory effects on NO/ONOO- production and fibroblast migration.\",\n      \"method\": \"AdipoR1 siRNA; AMPK siRNA; AMPK inhibitor; MTT, migration/scratch-wound assays; immunocytochemistry; RT-PCR; western blot; NO/ONOO- assays; adenovirus-adiponectin in ApoE-/- mice\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA epistasis with in vitro and in vivo validation, multiple readouts, single lab\",\n      \"pmids\": [\"19889816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Globular adiponectin activates NF-κB and induces COX-2 overexpression in human aortic endothelial cells through AdipoR1; AdipoR1 siRNA abrogated NF-κB activation and COX-2 expression, while p38MAPK/VCAM-1 activation was AdipoR1-independent.\",\n      \"method\": \"AdipoR1 siRNA; NF-κB activation assay; COX-2/VCAM-1 expression by western blot; monocyte adhesion assay; prostacyclin ELISA\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific siRNA with dissection of AdipoR1-dependent vs. independent pathways, single lab\",\n      \"pmids\": [\"21900123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Overexpression of AdipoR1 in rat skeletal muscle increased glucose uptake, glycogen accumulation, and AMPK/acetyl-CoA carboxylase phosphorylation, and reduced levels of specific ceramide species and ceramide synthetic enzyme mRNAs, demonstrating that enhanced AdipoR1 signaling is sufficient to improve local insulin sensitivity.\",\n      \"method\": \"In vivo electrotransfer-mediated AdipoR1 overexpression; hyperinsulinemic-euglycemic clamp; glucose uptake measurement; sphingolipid mass spectrometry; western blot of signaling molecules\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gain-of-function with clamp physiology and lipidomics, single lab\",\n      \"pmids\": [\"22989629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"miR-221 and the RNA-binding protein PTB cooperatively bind the AdipoR1 3'UTR and inhibit AdipoR1 translation; depletion of PTB or miR-221 increased AdipoR1 protein synthesis, while overexpression decreased it. Both PTB and miR-221 are upregulated in obesity, providing a mechanism for reduced AdipoR1 protein in obese animals.\",\n      \"method\": \"RNA-immunoprecipitation; luciferase reporter assays with 3'UTR constructs; siRNA depletion and overexpression of PTB and miR-221; AdipoR1 protein quantification in muscle and liver cells; mouse models of obesity\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — RNA-IP, luciferase reporter validation, gain- and loss-of-function, replicated in multiple cell types and in vivo\",\n      \"pmids\": [\"24130336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AdipoR1 deficiency in mice led to severe metabolic dysfunction (diet-induced obesity model), while AdipoR2 deficiency was protective from metabolic perturbations; conversely, AdipoR2 (not AdipoR1) was required for ischemia-induced revascularization and for adiponectin's pro-revascularization effects, revealing divergent in vivo roles.\",\n      \"method\": \"AdipoR1-/- and AdipoR2-/- mice; hind limb ischemia model; blood flow measurement; diet-induced obesity; metabolic phenotyping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific knockout in two distinct in vivo disease models with clear functional divergence\",\n      \"pmids\": [\"24742672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AdipoR1 (but not AdipoR2) depletion abolished the protective effects of the AdipoR1 agonist GTDF on osteoblasts, and AdipoR1 agonism restored osteopenia in diabetic mice by upregulating PGC-1α in osteoblasts; AdipoR1 deficiency in bone is a key mediator of diabetes-associated skeletal pathology.\",\n      \"method\": \"AdipoR1 siRNA; AdipoR1 agonist GTDF treatment; PGC-1α expression; db/db mouse model; bone mass measurements (µCT); osteoblast apoptosis assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific knockdown with in vivo pharmacological rescue, single lab\",\n      \"pmids\": [\"25633418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IPo (ischemic postconditioning) activates mitochondrial STAT3 through APN/AdipoR1/Caveolin-3 pathway to confer cardioprotection; specific AdipoR1 gene knockdown or Cav3 disruption abolished hypoxic postconditioning-induced protection, demonstrating that AdipoR1 forms a functional complex with Cav3 to transduce adiponectin cardioprotective signaling.\",\n      \"method\": \"AdipoR1 siRNA knockdown; Cav3 disruption; APN knockout mice; coronary occlusion/reperfusion model; mitochondrial STAT3 activation; mitochondrial function assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor knockdown and KO with functional cardiac readouts, single lab\",\n      \"pmids\": [\"26718505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A heterozygous missense mutation in ADIPOR1 (p.Y310C) causes autosomal dominant retinitis pigmentosa; the mutation affects protein folding and subcellular localization in vitro, and morpholino knockdown of adipor1 in zebrafish specifically reduced rod photoreceptor numbers, a phenotype partially rescued by wild-type but not mutant human ADIPOR1 mRNA.\",\n      \"method\": \"Exome sequencing; in vitro protein folding/localization assays; zebrafish morpholino knockdown; morphant rescue with wild-type vs. mutant ADIPOR1 mRNA\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — disease mutation functionally validated by in vitro structural assays and in vivo rescue experiment in zebrafish\",\n      \"pmids\": [\"27655171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ADIPOR1 is mutated (frameshift c.31delC) in a syndromic retinitis pigmentosa case, and ADIPOR1 protein is expressed in the retina; Adipor1-null mice exhibit retinal dystrophy, supporting ADIPOR1 as a disease-causing gene for syndromic RP.\",\n      \"method\": \"Whole-exome sequencing; immunohistochemistry of retinal tissue; Adipor1-null mouse phenotype\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human mutation with confirmatory IHC and mouse model, single study\",\n      \"pmids\": [\"26662040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AdipoR1 is expressed in dorsal raphe nucleus serotonin (5-HT) neurons; selective deletion of AdipoR1 in 5-HT neurons decreased TPH2 expression and 5-HT immunoreactivity, upregulated SERT, and induced anhedonia and behavioral despair in a sex-dependent manner, establishing AdipoR1 as a regulator of serotonergic neurotransmission and depression-related behavior.\",\n      \"method\": \"Conditional (cell-type-specific) AdipoR1 knockout in 5-HT neurons; immunofluorescence for TPH2/SERT; behavioral tests (sucrose preference, saccharin preference, FST); fluoxetine vs. desipramine pharmacological dissection\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with molecular (TPH2, SERT) and behavioral phenotypes plus pharmacological validation\",\n      \"pmids\": [\"31980728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AdipoR1 is expressed on VTA dopamine neurons; intra-VTA infusion of adiponectin decreases basal dopamine neuron firing and reverses stress-induced dopamine activity and anxiety, and these effects are abolished in mice lacking AdipoR1 specifically in dopamine neurons.\",\n      \"method\": \"Conditional AdipoR1 knockout in dopamine neurons; electrophysiology (population activity, firing rate); intra-VTA infusion; anxiety behavioral tests; adiponectin haploinsufficiency\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with electrophysiological and behavioral readouts confirming AdipoR1 necessity\",\n      \"pmids\": [\"29988086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Adiponectin attenuates neuronal apoptosis after neonatal hypoxia-ischemia via sequential activation of AdipoR1→APPL1→LKB1→AMPK; siRNA knockdown of any component (AdipoR1, APPL1, or LKB1) abolished the anti-apoptotic effects of recombinant adiponectin.\",\n      \"method\": \"AdipoR1, APPL1, and LKB1 siRNA (intracerebroventricular); intranasal rh-Adiponectin administration; brain infarct measurement; TUNEL; western blot of pathway components; neurological function testing\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multi-step epistasis via sequential siRNA knockdowns with in vivo functional readouts, single lab\",\n      \"pmids\": [\"29486166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AdipoR1 and AdipoR2 are essential for maintaining membrane phospholipid unsaturation and membrane fluidity in most human cell types, independently of adiponectin; loss of AdipoRs causes membrane rigidification when cells are challenged with saturated fatty acids, demonstrating a ligand-independent membrane homeostasis function.\",\n      \"method\": \"AdipoR1/AdipoR2 double knockout; FRAP; Laurdan dye generalized polarization; phospholipid fatty acid composition by mass spectrometry; palmitate challenge; primary HUVECs and multiple human cell lines\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — three independent biophysical methods with genetic KO across multiple cell types, single study\",\n      \"pmids\": [\"30890562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AdipoR1 knockdown in BV2 microglia abolished adiponectin's ability to suppress AβO-induced TNFα and IL-1β release and AMPK phosphorylation, and prevented NF-κB nuclear translocation, placing AdipoR1 upstream of AMPK→NF-κB in the anti-neuroinflammatory pathway.\",\n      \"method\": \"AdipoR1/AdipoR2 siRNA in BV2 cells; AMPK inhibitor (Compound C); cytokine ELISA; AMPK phosphorylation by western blot; NF-κB nuclear translocation; APN-/-5xFAD mice neuroinflammation assessment\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific siRNA with pharmacological AMPK inhibition and in vivo validation, single lab\",\n      \"pmids\": [\"31128596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Crystal structure of a D208A variant AdipoR1 revealed both 'closed' and 'open' conformations, with helices IV and V shifting ~4-11 Å at intracellular ends between states; reanalysis of wild-type AdipoR1 diffraction data also showed a 44:56 mixture of closed and open forms, suggesting conformational switching is relevant to receptor function.\",\n      \"method\": \"X-ray crystallography of D208A AdipoR1 variant; structural comparison with wild-type; reanalysis of wild-type diffraction data\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis and conformational analysis\",\n      \"pmids\": [\"32796916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AdipoR1 possesses intrinsic ceramidase activity; AdipoR1 knockout in mice causes ceramide accumulation in the retina leading to photoreceptor degeneration, and pharmacological inhibition of ceramide generation (desipramine/L-cycloserine) rescued photoreceptor survival and improved visual function in AdipoR1-/- mice.\",\n      \"method\": \"AdipoR1-/- mice; single-cell RNA-seq; ceramide quantification by lipidomics; ERG; pharmacological rescue with desipramine/L-cycloserine; primary visual cortex electrophysiology\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — enzymatic function (ceramidase) established with KO lipidomics, single-cell transcriptomics, pharmacological rescue, and multiple functional visual readouts\",\n      \"pmids\": [\"35015730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADIPOR1 deficiency in mice suppresses retinal ELOVL2 expression and reduces docosahexaenoic acid (DHA) levels in photoreceptor outer segment membranes prior to cell death, and this causal relationship between ADIPOR1 and ELOVL2 repression was confirmed in vitro, establishing ADIPOR1 as required for DHA supply to photoreceptors.\",\n      \"method\": \"Adipor1 KO mice; ERG; lipid composition analysis; gene expression (RT-qPCR, microarray); in vitro ADIPOR1 depletion confirming ELOVL2 regulation; electron microscopy of outer segments\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with lipidomics and in vitro confirmation of ELOVL2 regulation, single lab\",\n      \"pmids\": [\"33963174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Post-developmental conditional knockout of AdipoR1 specifically in photoreceptors or the RPE caused decreased retinal protein expression and visual dysfunction, and loss of AdipoR1 in the RPE alone (as in the Mfrprd6 mouse) is sufficient to drive retinal degeneration.\",\n      \"method\": \"Conditional (photoreceptor- and RPE-specific) AdipoR1 knockout; ERG; immunohistochemistry; Mfrprd6 mouse ADIPOR1 expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with functional visual phenotype, linkage to disease model\",\n      \"pmids\": [\"30254279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AdipoR1 is required for adiponectin receptor agonist (AdipoRon) signaling to AMPK in the context of Alzheimer's disease; both AdipoR1 silencing and AMPK inhibition (compound C) reversed AdipoRon-mediated neural stem cell proliferation and cognitive improvement in APP/PS1 mice.\",\n      \"method\": \"AdipoR1 siRNA; AMPK inhibitor; in vivo APP/PS1 transgenic mice; Morris water maze; BrdU/Ki67 staining for NSC proliferation; BACE1/Aβ quantification\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA and pharmacological inhibitor epistasis in vitro and in vivo, single lab\",\n      \"pmids\": [\"32070713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"High glucose/high lipid conditions dissociate the AdipoR1/Caveolin-1 (Cav1) signaling complex in endothelial cells by reducing Cav1 expression; Cav1 knockdown impaired adiponectin's anti-oxidative and anti-inflammatory actions, while Cav1 overexpression preserved APN signaling. A mutated Cav1 scaffolding domain restored caveolae structure but not APN signaling, demonstrating the AdipoR1/Cav1 interaction is critical for adiponectin vascular signaling.\",\n      \"method\": \"Co-immunoprecipitation; Cav1 siRNA and overexpression; mutant Cav1 knock-in; eNOS/AMPK/Akt phosphorylation; NO measurement; diabetic vascular tissue analysis\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, mutagenesis, gain/loss-of-function with functional signaling readouts, single lab\",\n      \"pmids\": [\"26453924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AdipoR1 conditional knockout in CD4+ T cells inhibited Th17 cell differentiation by reducing HIF-1α expression and glycolysis, and AdipoR1-deficient mice showed ameliorated joint inflammation in antigen-induced arthritis, identifying AdipoR1 as a regulator of Th17 differentiation via HIF-1α-dependent metabolic reprogramming.\",\n      \"method\": \"T cell lineage AdipoR1 conditional KO; RNA-seq; Th17 differentiation assay in vitro; antigen-induced arthritis mouse model; HIF-1α/glycolysis metabolic measurements\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with RNA-seq and in vivo arthritis model, single lab\",\n      \"pmids\": [\"32973810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AdipoR1 directly targets and stabilizes Nrf2 protein in hepatocellular carcinoma cells after ionizing radiation; AdipoR1 knockdown suppressed Nrf2 and its target xCT, increasing ferroptosis after radiation, while rescue of Nrf2 or xCT reversed this effect, establishing an AdipoR1-Nrf2-xCT axis in radiation-induced ferroptosis.\",\n      \"method\": \"AdipoR1 siRNA knockdown; Nrf2/xCT western blot; ChIP for Nrf2 on xCT promoter; ferroptosis/cell death assays; erastin treatment; Nrf2/xCT rescue overexpression\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockdown with ChIP and rescue experiments establishing pathway order, single lab\",\n      \"pmids\": [\"35733794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AdipoR1 ubiquitination is induced by LPS+ATP in vitro, and Schisandrin A directly targets AdipoR1 protein to reduce this ubiquitination and activate AdipoR1/AMPK signaling, suppressing ferroptosis and NLRP3-mediated pyroptosis in diabetic nephropathy models.\",\n      \"method\": \"Direct binding assay; ubiquitination assay; AdipoR1/AMPK/TXNIP/NLRP3 pathway western blot; in vivo STZ/high-fat diabetic model\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — direct binding and ubiquitination assays without detailed mechanistic reconstitution, single lab\",\n      \"pmids\": [\"35996380\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADIPOR1 is a seven-transmembrane receptor with an intracellular N-terminus that functions as the primary adiponectin receptor in muscle and brain; upon ligand binding it induces Ca2+ influx to activate CaMKKβ→AMPK→SIRT1→PGC-1α (increasing mitochondrial biogenesis), signals through APPL1→LKB1→AMPK to suppress gluconeogenesis and SREBP1c, and regulates membrane phospholipid composition/fluidity via intrinsic ceramidase activity—particularly critical in retinal photoreceptors where it maintains DHA levels and ELOVL2 expression for photoreceptor survival. It also modulates NF-κB, p38MAPK, HIF-1α, and Nrf2 pathways in a cell-type-specific manner, and its surface availability is regulated post-translationally by ERp46 interaction (at its cytoplasmic N-terminus) and translationally by miR-221/PTB. The receptor undergoes closed-to-open conformational transitions (established by X-ray crystallography) and can form functional complexes with Caveolin-1 and Caveolin-3 for cardiovascular signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ADIPOR1 is a seven-transmembrane adiponectin receptor that functions as a central metabolic sensor coupling adiponectin signaling to AMPK activation, mitochondrial biogenesis, lipid homeostasis, and anti-inflammatory responses across diverse tissues including skeletal muscle, liver, brain, retina, and immune cells. Upon adiponectin binding, ADIPOR1 induces extracellular Ca²⁺ influx to activate CaMKKβ→AMPK→SIRT1→PGC-1α signaling, promoting mitochondrial content and exercise capacity, and signals through APPL1→LKB1→AMPK to suppress hepatic gluconeogenesis and SREBP1c-driven lipogenesis [PMID:20357764, PMID:19254698, PMID:17268472]. ADIPOR1 also possesses intrinsic ceramidase activity essential for maintaining membrane phospholipid unsaturation and DHA levels in photoreceptor outer segments; loss of this activity causes ceramide accumulation and retinal degeneration, and heterozygous or homozygous ADIPOR1 mutations cause retinitis pigmentosa in humans [PMID:35015730, PMID:30890562, PMID:27655171, PMID:26662040]. In the brain, cell-type-specific ADIPOR1 deletion in serotonergic or dopaminergic neurons disrupts neurotransmitter homeostasis and produces depression- and anxiety-related phenotypes, while its surface availability is regulated post-translationally by ERp46 retention and translationally by miR-221/PTB-mediated repression [PMID:31980728, PMID:29988086, PMID:20074551, PMID:24130336].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing that ADIPOR1 and ADIPOR2 are the principal in vivo adiponectin receptors — and that ADIPOR1 specifically mediates AMPK activation — resolved the long-standing question of receptor identity for adiponectin signaling.\",\n      \"evidence\": \"Targeted gene disruption (single and double KO mice) with metabolic phenotyping and adiponectin binding assays\",\n      \"pmids\": [\"17268472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ADIPOR1 selectively activates AMPK over other kinases was not defined\", \"Ligand-independent functions not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating AdipoR1-dependent signaling in hypothalamus (anorexigenic) and renal tubules (glycogen synthase inhibition) extended the receptor's functional reach beyond skeletal muscle and liver to brain and kidney.\",\n      \"evidence\": \"ICV adiponectin with receptor inhibition and behavioral/signaling readouts; immunohistochemistry and AMPK activity assays in isolated renal tubules\",\n      \"pmids\": [\"18394428\", \"18256313\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor subtype specificity relied on pharmacological inhibition rather than genetic deletion in the hypothalamic study\", \"Downstream mediators linking AMPK to behavioral output not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of LKB1 as a required intermediate between ADIPOR1 and AMPK-mediated SREBP1c suppression, and of the ADIPOR1–AMPK–iNOS axis in fibroblast migration, established branching downstream pathway architecture.\",\n      \"evidence\": \"LKB1-deleted hepatocytes and AdipoR1/AMPK siRNA in fibroblasts with epistasis analysis\",\n      \"pmids\": [\"19254698\", \"19889816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LKB1 vs. CaMKKβ dominance is tissue-specific was not resolved\", \"Direct physical interaction between ADIPOR1 and LKB1 not shown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The discovery that ADIPOR1 triggers extracellular Ca²⁺ influx to activate CaMKKβ→AMPK→SIRT1→PGC-1α, driving mitochondrial biogenesis and exercise endurance, defined the core muscle signaling cascade and its physiological consequences.\",\n      \"evidence\": \"Muscle-specific AdipoR1 conditional KO with Ca²⁺ measurements, SIRT1/PGC-1α acetylation assays, mitochondrial content, and exercise testing\",\n      \"pmids\": [\"20357764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ion channel mediating Ca²⁺ influx not identified\", \"Whether this cascade operates identically in human muscle unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of ERp46 as a physical interactor that retains ADIPOR1 intracellularly through binding to its N-terminal cytoplasmic domain revealed the first post-translational mechanism controlling receptor surface expression.\",\n      \"evidence\": \"Reciprocal Co-IP with MS, GST pull-down with truncation mapping, siRNA knockdown showing increased surface ADIPOR1 and enhanced AMPK signaling\",\n      \"pmids\": [\"20074551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ERp46 acts as a chaperone or quality-control factor was not distinguished\", \"Regulation of the ERp46–ADIPOR1 interaction under physiological stimuli not explored\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Multiple studies established ADIPOR1 as an upstream activator of NF-κB in both pro-inflammatory (endothelial COX-2, chondrocyte MMP-3) and anti-inflammatory (macrophage foam cell suppression via APPL1) contexts, revealing cell-type-dependent pathway utilization.\",\n      \"evidence\": \"AdipoR1 siRNA in endothelial cells, chondrocytes, and macrophages with NF-κB, COX-2, MMP-3, and cytokine readouts; APPL1 shRNA epistasis\",\n      \"pmids\": [\"21900123\", \"21321996\", \"22227293\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism determining whether ADIPOR1–NF-κB signaling is pro- or anti-inflammatory in a given cell type unknown\", \"APPL1 binding site on ADIPOR1 not mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The finding that miR-221 and PTB cooperatively repress ADIPOR1 translation via its 3′UTR — both being upregulated in obesity — provided a molecular explanation for reduced ADIPOR1 protein in metabolic disease.\",\n      \"evidence\": \"RNA-IP, luciferase 3′UTR reporters, gain- and loss-of-function in multiple cell types and obese mouse models\",\n      \"pmids\": [\"24130336\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether therapeutic targeting of miR-221/PTB restores ADIPOR1 levels and metabolic function in vivo not tested\", \"Other post-transcriptional regulators not surveyed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstration that ADIPOR1 forms functional signaling complexes with Caveolin-1 (endothelial) and Caveolin-3 (cardiomyocyte) — required for anti-oxidative, anti-inflammatory, and cardioprotective actions — established caveolae as critical signaling platforms for ADIPOR1.\",\n      \"evidence\": \"Co-IP, Cav1/Cav3 knockdown/overexpression and mutant Cav1 knock-in with eNOS/AMPK/STAT3 readouts; APN-KO ischemia/reperfusion model\",\n      \"pmids\": [\"26453924\", \"26718505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct structural basis for ADIPOR1–caveolin interaction not determined\", \"Whether caveolar localization affects ceramidase activity unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of ADIPOR1 mutations (p.Y310C and c.31delC) as causes of retinitis pigmentosa, validated by in vitro protein misfolding and zebrafish rescue experiments, established ADIPOR1 as a retinal disease gene.\",\n      \"evidence\": \"Exome sequencing of RP families; in vitro folding/localization of mutant protein; zebrafish morpholino knockdown rescued by WT but not mutant ADIPOR1; Adipor1-null mouse retinal dystrophy\",\n      \"pmids\": [\"27655171\", \"26662040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full allelic spectrum of ADIPOR1-associated retinal disease not defined\", \"Whether ceramidase loss alone explains photoreceptor death from these mutations not determined at this point\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cell-type-specific conditional knockouts in serotonergic and dopaminergic neurons demonstrated that ADIPOR1 is a non-redundant regulator of neurotransmitter synthesis and neuronal excitability, with loss producing depression- and anxiety-related behaviors.\",\n      \"evidence\": \"Conditional KO in 5-HT (Pet1-Cre) and DA (DAT-Cre) neurons; TPH2/SERT expression; electrophysiology of VTA DA neurons; behavioral testing with pharmacological dissection\",\n      \"pmids\": [\"31980728\", \"29988086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling pathway from ADIPOR1 to TPH2 transcription not mapped\", \"Whether adiponectin or a different ligand activates neuronal ADIPOR1 in vivo not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that ADIPOR1/R2 double-knockout cells exhibit membrane rigidification upon saturated fatty acid challenge — independent of adiponectin — revealed a ligand-independent membrane homeostasis function for the receptor.\",\n      \"evidence\": \"ADIPOR1/R2 DKO in HUVECs and multiple cell lines; FRAP, Laurdan dye, phospholipid mass spectrometry under palmitate challenge\",\n      \"pmids\": [\"30890562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of ADIPOR1 vs. ADIPOR2 to membrane fluidity maintenance not separated\", \"Whether this function requires ceramidase activity specifically not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Crystallographic resolution of closed-to-open conformational transitions in ADIPOR1 (helices IV and V shifting 4–11 Å) provided the first structural framework for understanding how receptor activation propagates signal to the intracellular domain.\",\n      \"evidence\": \"X-ray crystallography of D208A variant and reanalysis of wild-type diffraction data revealing 44:56 closed:open equilibrium\",\n      \"pmids\": [\"32796916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand-bound structure not captured; whether adiponectin binding shifts the conformational equilibrium is inferred but not proven\", \"How conformational change couples to AMPK activation or ceramidase activity not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Establishing that ADIPOR1 possesses intrinsic ceramidase activity — whose loss causes ceramide accumulation and photoreceptor degeneration rescuable by ceramide synthesis inhibitors — unified the retinal disease phenotype with a specific enzymatic mechanism.\",\n      \"evidence\": \"ADIPOR1-KO mice; retinal ceramide quantification by lipidomics; ERG and primary visual cortex electrophysiology; pharmacological rescue with desipramine/L-cycloserine\",\n      \"pmids\": [\"35015730\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetic parameters and substrate specificity of ADIPOR1 ceramidase activity not characterized biochemically with purified protein\", \"Whether ceramidase activity is regulated by adiponectin binding or conformational state not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: how adiponectin binding couples to the closed-to-open conformational switch and ceramidase activation; the identity of the Ca²⁺ channel mediating ADIPOR1-dependent Ca²⁺ influx; and whether neuronal ADIPOR1 functions are adiponectin-dependent or involve alternative ligands or ligand-independent mechanisms.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No ligand-bound ADIPOR1 structure available\", \"Ca²⁺ channel identity unknown\", \"Neuronal ligand identity uncertain\", \"Ceramidase kinetics with purified protein not reported\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [21, 24, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 16, 28]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 1, 3, 5, 8]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 11, 21, 24, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 29]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [18, 19]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 20, 30]}\n    ],\n    \"complexes\": [\n      \"AdipoR1/Caveolin-1 complex\",\n      \"AdipoR1/Caveolin-3 complex\"\n    ],\n    \"partners\": [\n      \"APPL1\",\n      \"ERp46\",\n      \"CAV1\",\n      \"CAV3\",\n      \"LKB1\",\n      \"ADIPOQ\",\n      \"ADIPOR2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}