{"gene":"ADRB3","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2007,"finding":"ADRB3 is present and functional in human myometrium; selective ADRB3 agonists inhibit spontaneous myometrial contractions via a cAMP-mediated pathway. ADRB3 is the predominant adrenergic receptor subtype over ADRB2 in human myometrium, its expression increases in near-term versus non-pregnant myometrium, and unlike ADRB2 it is resistant to long-term agonist-induced desensitization.","method":"In vitro myometrial strip contraction assay, cAMP measurement, RT-PCR, pharmacological subtype-selective blockade","journal":"BMC pregnancy and childbirth","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (functional assay, cAMP, receptor pharmacology, expression) in human tissue; replicated across related studies","pmids":["17570158"],"is_preprint":false},{"year":2007,"finding":"ADRB3 agonist SAR150640 prevents LPS-induced apoptosis (caspase-3 activation, BAX/BCL2 imbalance) and pro-inflammatory cytokine production (IL-6, IL-8) in human myometrium, identifying ADRB3 as a regulator of myometrial apoptosis and inflammation during chorioamnionitis.","method":"Immunostaining, Western blot, RT-PCR, in vitro LPS stimulation model of chorioamnionitis, TNF-α neutralization, pharmacological ADRB3 agonist treatment","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Western blot, RT-PCR, immunostaining, pharmacological intervention) in human tissue with mechanistic pathway detail","pmids":["17989355"],"is_preprint":false},{"year":2005,"finding":"ADRB3 is functionally expressed in human placental arteries and mediates cAMP-dependent vasorelaxation; preeclampsia reduces ADRB3 protein expression (without changing mRNA) and impairs ADRB3-mediated relaxation and cAMP production.","method":"Pharmacological relaxation assay on placental artery rings, cAMP measurement, Western blot, RT-PCR, selective receptor blockade with propranolol","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 1–2 — reconstituted functional assay plus protein/mRNA analysis with multiple orthogonal methods in human tissue","pmids":["16177222"],"is_preprint":false},{"year":2013,"finding":"Two novel ADRB3 missense polymorphisms (Ser165Pro and Ser257Pro) impair cAMP accumulation activity in stably transfected HEK293 and CHO-K1 cells without affecting receptor expression or intracellular trafficking, demonstrating that these variants reduce receptor signaling function.","method":"Site-directed mutagenesis, stable cell transfection (HEK293 and CHO-K1), cAMP assay, real-time PCR, Western blot, confocal microscopy","journal":"The Journal of clinical endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis, cAMP functional assay, and trafficking analysis in two cell lines","pmids":["23640967"],"is_preprint":false},{"year":2022,"finding":"ADRB3 activation in brown adipocytes reduces iNOS content in secreted exosomes; brown adipocyte-specific ADRB3 knockout (BKO) or pharmacological ADRB3 antagonism increases exosomal iNOS, which promotes cardiac fibroblast dysfunction, cardiac hypertrophy, and fibrosis. Knockdown of iNOS in brown adipocytes reverses this effect, establishing an ADRB3 → exosomal iNOS → cardiac remodeling axis.","method":"Brown adipocyte-specific ADRB3 knockout mice, Ang II infusion model, exosome isolation and intravenous injection, iNOS knockdown, cardiac function assessment, in vitro co-culture experiments","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — conditional KO mice, exosome rescue experiments, and iNOS knockdown provide multiple orthogonal lines of evidence for the mechanistic pathway","pmids":["35652349"],"is_preprint":false},{"year":2014,"finding":"Norepinephrine (NE) inhibits SDF-1-induced mesenchymal stem cell (MSC) migration and osteogenic differentiation via ADRB3; siRNA knockdown of adrb3 abolishes NE-mediated inhibition of both MSC migration (including MMP-2/TIMP-3 expression) and bone nodule formation (ALP, OCN, RUNX2 expression). Sympathetic denervation in vivo depletes NE, down-regulates ADRB3 in MSCs, and promotes their migration to bone-forming units.","method":"Rat mandibular distraction osteogenesis model with sympathetic trunk transection, Transwell migration assay, siRNA knockdown of adrb3, in vitro osteogenic differentiation assay, RT-PCR","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function (siRNA) with specific cellular phenotype readout corroborated by in vivo sympathetic denervation model","pmids":["25144690"],"is_preprint":false},{"year":2009,"finding":"ADRB3 mediates antidepressant-like behavioral effects; Adrb3 knockout mice fail to show behavioral improvement with the ADRB3 agonist amibegron in the chronic mild stress model, demonstrating that the receptor is required for these effects.","method":"Adrb3 knockout (Adrb3tm1Lowl) mice, chronic mild stress paradigm, pharmacological challenge with amibegron","journal":"Behavioural brain research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined behavioral phenotype, single study","pmids":["19744528"],"is_preprint":false},{"year":2021,"finding":"HDAC3 suppresses miR-18a, which directly targets and negatively regulates ADRB3 mRNA; in heart failure, elevated HDAC3 leads to reduced miR-18a and consequent ADRB3 upregulation, promoting cardiac hypertrophy, fibrosis, and cardiomyocyte apoptosis. Dual luciferase reporter assay validated the miR-18a–ADRB3 targeting relationship.","method":"Dual luciferase reporter assay, ectopic expression and silencing experiments in HF mouse model and cardiomyocytes, RT-qPCR, Western blot, flow cytometry, TUNEL staining","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 — validated miRNA–target relationship by luciferase assay plus gain/loss-of-function in disease model, single lab","pmids":["33549119"],"is_preprint":false},{"year":2022,"finding":"ADRB3 promotes breast cancer cell proliferation and inhibits transdifferentiation into adipocyte-like cells by activating the mTOR pathway; it also promotes MDSC expansion through stimulation of bone marrow mobilization and inhibition of myeloid cell differentiation. ADRB3-knockout PyMT mice show impaired mammary tumorigenesis and reduced pulmonary metastasis.","method":"ADRB3 KO PyMT mouse model, immunohistochemistry, in vitro proliferation and differentiation assays, MDSC flow cytometry, pathway analysis (mTOR)","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO mouse model with tumor phenotype plus in vitro pathway identification, single lab","pmids":["35145073"],"is_preprint":false},{"year":2024,"finding":"Swertiamarin (STM) directly interacts with ADRB3 and activates ADRB3/UCP1 thermogenic signaling in adipocytes, increasing glucose uptake, glycerol release, p-HSL expression, mitochondrial content, and oxidative phosphorylation; these effects are reversed by ADRB3 inhibition, placing ADRB3 upstream of UCP1-mediated thermogenesis.","method":"In vivo HFD/STZ T2DM mouse model, 3T3-L1 adipocyte differentiation, ADRB3 inhibitor treatment, Western blot, bioinformatics, metabolic measurements","journal":"Phytomedicine","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological inhibition with multiple downstream readouts, single lab","pmids":["39515102"],"is_preprint":false},{"year":2025,"finding":"In the SCN-regulated thermogenic circuit, ADRB3 activation in brown adipocytes drives upregulation of S100B, a calcium-binding protein; S100B in turn promotes brown adipocyte proliferation, suppresses senescence, and sustains BAT thermogenesis. S100B is both necessary and sufficient for thermogenesis downstream of ADRB3, establishing a SCN→sympathetic tone→ADRB3→cAMP→S100B signaling axis.","method":"SCN lesioning, circadian arrhythmia models, NMDA excitotoxicity, Caspase-3 ablation, in vivo ADRB3 agonist administration, S100B functional studies (necessity and sufficiency), indirect calorimetry","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple SCN disruption models converge on same effector with necessity/sufficiency functional validation, single study","pmids":["41343575"],"is_preprint":false},{"year":2025,"finding":"WWP1 (a HECT-type E3 ubiquitin ligase) suppresses Adrb3 mRNA expression in white adipose tissue under obese conditions; Wwp1 knockout in mice increases Adrb3 expression and phosphorylated hormone-sensitive lipase (p-HSL) levels, promoting lipolysis independently of noradrenaline metabolism, indicating WWP1 is an upstream negative regulator of ADRB3-dependent lipolysis.","method":"Wwp1 knockout mice on high-fat diet, RT-qPCR, Western blot for p-HSL, noradrenaline measurement in WAT","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined molecular readouts (mRNA, p-HSL), single lab, moderate evidence","pmids":["40362456"],"is_preprint":false},{"year":2024,"finding":"Acute alcohol binge activates sympathetic nerve-ADRB3 signaling in white adipose tissue, driving lipolysis and free fatty acid release that contributes to alcoholic hepatic steatosis and liver injury; fat-specific Adrb3 knockout (Adrb3 FKO) mice are protected from alcohol-induced adipose lipolysis, hepatic fat accumulation, and liver damage.","method":"Single alcohol binge model, 6-OHDA sympathetic nerve ablation (systemic and local), fat-specific Adrb3 KO mice, measurement of WAT norepinephrine, plasma FFA, liver histology","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — tissue-specific KO with multiple phenotypic readouts and sympathetic ablation validation; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"KLF7 is required for ADRB3-induced IL-6 production in brown adipocytes during stress; ADRB3 activation triggers cAMP-PKA-CREB signaling, CREB binds the KLF7 promoter to induce its transcription, and KLF7 then drives IL-6 expression. Klf7 adipocyte knockout mice show impaired stress-induced IL-6 release.","method":"Klf7 adipocyte-specific knockout mice, ADRB3 agonist administration in vivo, in vitro brown adipocyte culture with PKA/CREB inhibitors, CREB ChIP on KLF7 promoter, IL-6 ELISA","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1–2 — in vivo KO plus in vitro mechanistic dissection with ChIP, multiple inhibitor experiments, and pathway reconstitution","pmids":["41565113"],"is_preprint":false}],"current_model":"ADRB3 is a Gs-coupled adrenergic receptor predominantly expressed in adipose tissue (brown and white), myometrium, and placental vasculature that signals through cAMP-PKA-CREB to regulate lipolysis, thermogenesis (via UCP1), and smooth muscle relaxation; in brown adipocytes it controls an endocrine program that suppresses exosomal iNOS to protect the heart and drives a KLF7-dependent IL-6 secretion axis during stress, while in white adipose tissue sympathetic nerve-released norepinephrine activates ADRB3 to stimulate hormone-sensitive lipase-dependent lipolysis—a process negatively regulated upstream by the E3 ubiquitin ligase WWP1 and gated by the SCN circadian clock through an ADRB3-S100B signaling module."},"narrative":{"teleology":[{"year":2005,"claim":"Demonstrating that ADRB3 is functionally active in human placental vasculature established it as a cAMP-coupled vasorelaxant receptor outside classical adipose contexts, and revealed that preeclampsia selectively reduces its protein without altering mRNA.","evidence":"Pharmacological relaxation of human placental artery rings with selective agonists, cAMP quantification, Western blot, and RT-PCR","pmids":["16177222"],"confidence":"High","gaps":["Mechanism of post-transcriptional ADRB3 protein downregulation in preeclampsia not identified","Downstream effectors of cAMP-mediated vasorelaxation not delineated"]},{"year":2007,"claim":"Showing that ADRB3 is the predominant β-adrenoceptor in human myometrium and mediates desensitization-resistant relaxation reframed it as a tocolytic target, while a parallel study demonstrated ADRB3 agonism prevents LPS-induced apoptosis and cytokine release, linking ADRB3 to anti-inflammatory and anti-apoptotic signaling in reproductive tissue.","evidence":"Human myometrial strip contraction assays, cAMP measurements, RT-PCR, pharmacological blockade; LPS-stimulated myometrial explants with Western blot, immunostaining, and caspase-3/BAX/BCL2 analysis","pmids":["17570158","17989355"],"confidence":"High","gaps":["Intracellular pathway from cAMP to apoptosis suppression not fully dissected","Whether desensitization resistance is unique to myometrium or a general ADRB3 property remains untested"]},{"year":2009,"claim":"Using Adrb3-knockout mice to show the receptor is required for the antidepressant-like behavioral effects of the selective agonist amibegron extended ADRB3 function into the central nervous system.","evidence":"Adrb3 KO mice in chronic mild stress paradigm with pharmacological challenge","pmids":["19744528"],"confidence":"Medium","gaps":["Brain region and cell type expressing functional ADRB3 not identified","Downstream signaling mediating behavioral effect unknown","Single behavioral paradigm from one lab"]},{"year":2013,"claim":"Reconstituting missense ADRB3 variants (Ser165Pro, Ser257Pro) in two cell lines showed that specific residues are required for cAMP signaling without affecting surface trafficking, providing a structure-function map of the receptor.","evidence":"Site-directed mutagenesis with stable expression in HEK293 and CHO-K1 cells, cAMP assay, confocal microscopy","pmids":["23640967"],"confidence":"High","gaps":["No structural model explaining how these residues affect G-protein coupling","Physiological consequences of these variants in vivo not tested"]},{"year":2014,"claim":"Identifying ADRB3 as the receptor through which norepinephrine inhibits MSC migration and osteogenic differentiation revealed a non-metabolic role for sympathetic-ADRB3 signaling in bone biology.","evidence":"siRNA knockdown of Adrb3 in MSCs plus in vivo sympathetic denervation in rat mandibular distraction model","pmids":["25144690"],"confidence":"High","gaps":["Whether ADRB3 is the sole adrenergic receptor on MSCs mediating these effects is not excluded","Direct downstream signaling from ADRB3 in MSCs not mapped"]},{"year":2021,"claim":"Validating miR-18a as a direct negative regulator of ADRB3 mRNA, itself suppressed by HDAC3, established an epigenetic–post-transcriptional axis (HDAC3→miR-18a→ADRB3) that upregulates ADRB3 in heart failure and promotes cardiac hypertrophy.","evidence":"Dual luciferase reporter assay confirming miR-18a–ADRB3 3′UTR interaction; gain/loss-of-function in HF mouse model with Western blot, TUNEL, flow cytometry","pmids":["33549119"],"confidence":"Medium","gaps":["Whether ADRB3 upregulation is causative or correlative in heart failure progression not directly tested by rescue","Single-lab finding"]},{"year":2022,"claim":"Brown adipocyte-specific ADRB3 knockout revealed that ADRB3 suppresses exosomal iNOS release; loss of this suppression drives cardiac fibroblast dysfunction, hypertrophy, and fibrosis, establishing a brown fat–heart endocrine axis mediated by exosomes.","evidence":"Conditional Adrb3 KO in brown adipocytes, Ang II cardiac stress model, exosome isolation and intravenous injection, iNOS knockdown rescue, cardiac functional assessment","pmids":["35652349"],"confidence":"High","gaps":["Mechanism by which ADRB3 signaling controls iNOS loading into exosomes not resolved","Whether this axis operates in humans unknown"]},{"year":2022,"claim":"Demonstrating that ADRB3 knockout in PyMT mice impairs mammary tumorigenesis and metastasis, and that ADRB3 promotes tumor cell proliferation via mTOR and MDSC expansion, extended receptor function into cancer immunobiology.","evidence":"ADRB3 KO PyMT mouse model, proliferation/differentiation assays, MDSC quantification by flow cytometry","pmids":["35145073"],"confidence":"Medium","gaps":["Whether ADRB3 acts cell-autonomously in tumor cells versus through the immune microenvironment not fully separated","Mechanism linking ADRB3 to mTOR activation not delineated"]},{"year":2024,"claim":"Pharmacological and genetic evidence placed ADRB3 upstream of UCP1-mediated thermogenesis in adipocytes, with swertiamarin identified as a direct ADRB3-binding agonist that drives glucose uptake, lipolysis (p-HSL), and mitochondrial biogenesis.","evidence":"HFD/STZ T2DM mouse model, 3T3-L1 adipocytes with ADRB3 inhibitor reversal, Western blot, metabolic measurements","pmids":["39515102"],"confidence":"Medium","gaps":["Binding site and affinity of swertiamarin for ADRB3 not structurally characterized","Relative contribution of ADRB3 versus other adrenergic receptors in this model not fully excluded"]},{"year":2025,"claim":"Integrating SCN lesioning with ADRB3 agonist studies identified S100B as both necessary and sufficient for ADRB3-driven brown adipocyte thermogenesis, embedding ADRB3 within a circadian clock–sympathetic–BAT circuit (SCN→sympathetic tone→ADRB3→cAMP→S100B).","evidence":"SCN lesioning, circadian arrhythmia models, in vivo ADRB3 agonist, S100B necessity/sufficiency experiments, indirect calorimetry","pmids":["41343575"],"confidence":"Medium","gaps":["Transcriptional or post-translational mechanism linking cAMP to S100B upregulation not defined","Whether S100B acts cell-autonomously or through paracrine signaling not resolved"]},{"year":2025,"claim":"Two concurrent studies clarified upstream regulators and downstream effectors of ADRB3 in adipose tissue: WWP1 was shown to suppress Adrb3 mRNA to limit lipolysis in WAT, while KLF7 was identified as a CREB-induced transcription factor required for ADRB3-stimulated IL-6 secretion from brown adipocytes during stress.","evidence":"Wwp1 KO mice on HFD with RT-qPCR and p-HSL Western blot; Klf7 adipocyte-specific KO mice with ADRB3 agonist, CREB ChIP on KLF7 promoter, PKA/CREB inhibitors, IL-6 ELISA","pmids":["40362456","41565113"],"confidence":"High","gaps":["Mechanism by which WWP1 suppresses Adrb3 transcription (direct ubiquitination of a transcription factor?) unknown","Whether the KLF7–IL-6 axis operates in human brown fat not tested"]},{"year":null,"claim":"The structural basis for ADRB3's resistance to desensitization, the mechanisms controlling exosomal iNOS packaging, and the identity of WWP1's substrate that controls Adrb3 transcription remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of human ADRB3 in active or inactive state","Mechanism of desensitization resistance not molecularly defined","Direct ubiquitination target of WWP1 upstream of Adrb3 unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,2,3,4,9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,3]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,3,4,9,10,13]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[9,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,8]}],"complexes":[],"partners":["UCP1","KLF7","S100B","WWP1","HSL","INOS"],"other_free_text":[]},"mechanistic_narrative":"ADRB3 is a Gs-coupled β3-adrenergic receptor that transduces sympathetic catecholamine signals into cAMP-dependent responses across adipose, reproductive, vascular, and immune tissues, governing lipolysis, thermogenesis, smooth muscle relaxation, and endocrine communication. In brown adipocytes, ADRB3 activation drives cAMP-PKA-CREB signaling to induce UCP1-mediated thermogenesis via an S100B effector arm, suppresses exosomal iNOS release that otherwise promotes cardiac remodeling, and engages a KLF7-dependent transcriptional program for stress-induced IL-6 secretion [PMID:35652349, PMID:41343575, PMID:41565113, PMID:39515102]. In white adipose tissue, sympathetic norepinephrine activates ADRB3 to stimulate hormone-sensitive lipase-dependent lipolysis, a pathway negatively regulated by the E3 ubiquitin ligase WWP1 and gated by suprachiasmatic nucleus circadian output [PMID:40362456, PMID:41343575]. In human myometrium and placental vasculature, ADRB3 mediates cAMP-dependent smooth muscle relaxation, resists agonist-induced desensitization, and exerts anti-apoptotic and anti-inflammatory effects, with its protein expression reduced in preeclampsia [PMID:17570158, PMID:17989355, PMID:16177222]."},"prefetch_data":{"uniprot":{"accession":"P13945","full_name":"Beta-3 adrenergic receptor","aliases":["Beta-3 adrenoreceptor","Beta-3 adrenoceptor"],"length_aa":408,"mass_kda":43.5,"function":"G protein-coupled receptor for catecholamines that couples to both G(s) and G(i) proteins, leading to either activation or inhibition of adenylate cyclase and cAMP-dependent pathway, respectively (PubMed:10188996, PubMed:2570461, PubMed:8641219). The rank order of potency for physiological agonists is norepinephrine > epinephrine (PubMed:10188996, PubMed:2570461, PubMed:8641219). Involved in the regulation of thermogenesis and lipolysis in brown and white adipose tissue, after coupling to G(s) proteins and stimulation of the cAMP-PKA axis (By similarity). Also activates lipolytic process by coupling to G(i) proteins and consequent initiation of the ERK1/2 MAP kinase cascade (PubMed:10207024). Participates in relaxation of the blood vessels and the urinary bladder (PubMed:10188996). Also mediates negative inotropic effects in cardiomyocytes through activation of an NO synthase pathway and subsequent increase in cGMP levels, possibly involving G(i/o) protein-mediated coupling (PubMed:9769330)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P13945/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADRB3","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ADRB3","total_profiled":1310},"omim":[{"mim_id":"620373","title":"ADIPOSE-SECRETED SIGNALING PROTEIN; ADISSP","url":"https://www.omim.org/entry/620373"},{"mim_id":"617851","title":"SERTA DOMAIN-CONTAINING PROTEIN 2; SERTAD2","url":"https://www.omim.org/entry/617851"},{"mim_id":"602186","title":"VGF, NERVE GROWTH FACTOR-INDUCIBLE; VGF","url":"https://www.omim.org/entry/602186"},{"mim_id":"601665","title":"OBESITY","url":"https://www.omim.org/entry/601665"},{"mim_id":"600835","title":"CHEMOKINE, CXC MOTIF, LIGAND 12; CXCL12","url":"https://www.omim.org/entry/600835"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Vesicles","reliability":"Uncertain"},{"location":"Basal body","reliability":"Uncertain"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"fallopian tube","ntpm":5.3},{"tissue":"ovary","ntpm":12.8},{"tissue":"urinary bladder","ntpm":5.2}],"url":"https://www.proteinatlas.org/search/ADRB3"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P13945","domains":[{"cath_id":"1.20.1070.10","chopping":"35-244_283-362","consensus_level":"medium","plddt":92.775,"start":35,"end":362}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P13945","model_url":"https://alphafold.ebi.ac.uk/files/AF-P13945-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P13945-F1-predicted_aligned_error_v6.png","plddt_mean":78.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADRB3","jax_strain_url":"https://www.jax.org/strain/search?query=ADRB3"},"sequence":{"accession":"P13945","fasta_url":"https://rest.uniprot.org/uniprotkb/P13945.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P13945/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P13945"}},"corpus_meta":[{"pmid":"18574485","id":"PMC_18574485","title":"The ADRB3 Trp64Arg variant and BMI: a meta-analysis of 44 833 individuals.","date":"2008","source":"International journal of obesity (2005)","url":"https://pubmed.ncbi.nlm.nih.gov/18574485","citation_count":67,"is_preprint":false},{"pmid":"18611262","id":"PMC_18611262","title":"Genetic variation in candidate obesity genes ADRB2, ADRB3, GHRL, HSD11B1, IRS1, IRS2, and SHC1 and risk for breast cancer in the Cancer Prevention Study II.","date":"2008","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/18611262","citation_count":42,"is_preprint":false},{"pmid":"35652349","id":"PMC_35652349","title":"Brown Adipocyte ADRB3 Mediates Cardioprotection via Suppressing Exosomal iNOS.","date":"2022","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/35652349","citation_count":40,"is_preprint":false},{"pmid":"24579945","id":"PMC_24579945","title":"ADRB3 gene promoter DNA methylation in blood and visceral adipose tissue is associated with metabolic disturbances in men.","date":"2014","source":"Epigenomics","url":"https://pubmed.ncbi.nlm.nih.gov/24579945","citation_count":39,"is_preprint":false},{"pmid":"25144690","id":"PMC_25144690","title":"Sympathetic denervation-induced MSC mobilization in distraction osteogenesis associates with inhibition of MSC migration and osteogenesis by norepinephrine/adrb3.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25144690","citation_count":33,"is_preprint":false},{"pmid":"22937051","id":"PMC_22937051","title":"Human-specific SNP in obesity genes, adrenergic receptor beta2 (ADRB2), Beta3 (ADRB3), and PPAR γ2 (PPARG), during primate evolution.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22937051","citation_count":28,"is_preprint":false},{"pmid":"19553224","id":"PMC_19553224","title":"Trp64Arg polymorphism in ADRB3 gene is associated with elite endurance performance.","date":"2009","source":"British journal of sports 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ADRB3 is the predominant adrenergic receptor subtype over ADRB2 in human myometrium, its expression increases in near-term versus non-pregnant myometrium, and unlike ADRB2 it is resistant to long-term agonist-induced desensitization.\",\n      \"method\": \"In vitro myometrial strip contraction assay, cAMP measurement, RT-PCR, pharmacological subtype-selective blockade\",\n      \"journal\": \"BMC pregnancy and childbirth\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (functional assay, cAMP, receptor pharmacology, expression) in human tissue; replicated across related studies\",\n      \"pmids\": [\"17570158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ADRB3 agonist SAR150640 prevents LPS-induced apoptosis (caspase-3 activation, BAX/BCL2 imbalance) and pro-inflammatory cytokine production (IL-6, IL-8) in human myometrium, identifying ADRB3 as a regulator of myometrial apoptosis and inflammation during chorioamnionitis.\",\n      \"method\": \"Immunostaining, Western blot, RT-PCR, in vitro LPS stimulation model of chorioamnionitis, TNF-α neutralization, pharmacological ADRB3 agonist treatment\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Western blot, RT-PCR, immunostaining, pharmacological intervention) in human tissue with mechanistic pathway detail\",\n      \"pmids\": [\"17989355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ADRB3 is functionally expressed in human placental arteries and mediates cAMP-dependent vasorelaxation; preeclampsia reduces ADRB3 protein expression (without changing mRNA) and impairs ADRB3-mediated relaxation and cAMP production.\",\n      \"method\": \"Pharmacological relaxation assay on placental artery rings, cAMP measurement, Western blot, RT-PCR, selective receptor blockade with propranolol\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstituted functional assay plus protein/mRNA analysis with multiple orthogonal methods in human tissue\",\n      \"pmids\": [\"16177222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Two novel ADRB3 missense polymorphisms (Ser165Pro and Ser257Pro) impair cAMP accumulation activity in stably transfected HEK293 and CHO-K1 cells without affecting receptor expression or intracellular trafficking, demonstrating that these variants reduce receptor signaling function.\",\n      \"method\": \"Site-directed mutagenesis, stable cell transfection (HEK293 and CHO-K1), cAMP assay, real-time PCR, Western blot, confocal microscopy\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis, cAMP functional assay, and trafficking analysis in two cell lines\",\n      \"pmids\": [\"23640967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADRB3 activation in brown adipocytes reduces iNOS content in secreted exosomes; brown adipocyte-specific ADRB3 knockout (BKO) or pharmacological ADRB3 antagonism increases exosomal iNOS, which promotes cardiac fibroblast dysfunction, cardiac hypertrophy, and fibrosis. Knockdown of iNOS in brown adipocytes reverses this effect, establishing an ADRB3 → exosomal iNOS → cardiac remodeling axis.\",\n      \"method\": \"Brown adipocyte-specific ADRB3 knockout mice, Ang II infusion model, exosome isolation and intravenous injection, iNOS knockdown, cardiac function assessment, in vitro co-culture experiments\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mice, exosome rescue experiments, and iNOS knockdown provide multiple orthogonal lines of evidence for the mechanistic pathway\",\n      \"pmids\": [\"35652349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Norepinephrine (NE) inhibits SDF-1-induced mesenchymal stem cell (MSC) migration and osteogenic differentiation via ADRB3; siRNA knockdown of adrb3 abolishes NE-mediated inhibition of both MSC migration (including MMP-2/TIMP-3 expression) and bone nodule formation (ALP, OCN, RUNX2 expression). Sympathetic denervation in vivo depletes NE, down-regulates ADRB3 in MSCs, and promotes their migration to bone-forming units.\",\n      \"method\": \"Rat mandibular distraction osteogenesis model with sympathetic trunk transection, Transwell migration assay, siRNA knockdown of adrb3, in vitro osteogenic differentiation assay, RT-PCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function (siRNA) with specific cellular phenotype readout corroborated by in vivo sympathetic denervation model\",\n      \"pmids\": [\"25144690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ADRB3 mediates antidepressant-like behavioral effects; Adrb3 knockout mice fail to show behavioral improvement with the ADRB3 agonist amibegron in the chronic mild stress model, demonstrating that the receptor is required for these effects.\",\n      \"method\": \"Adrb3 knockout (Adrb3tm1Lowl) mice, chronic mild stress paradigm, pharmacological challenge with amibegron\",\n      \"journal\": \"Behavioural brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined behavioral phenotype, single study\",\n      \"pmids\": [\"19744528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HDAC3 suppresses miR-18a, which directly targets and negatively regulates ADRB3 mRNA; in heart failure, elevated HDAC3 leads to reduced miR-18a and consequent ADRB3 upregulation, promoting cardiac hypertrophy, fibrosis, and cardiomyocyte apoptosis. Dual luciferase reporter assay validated the miR-18a–ADRB3 targeting relationship.\",\n      \"method\": \"Dual luciferase reporter assay, ectopic expression and silencing experiments in HF mouse model and cardiomyocytes, RT-qPCR, Western blot, flow cytometry, TUNEL staining\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — validated miRNA–target relationship by luciferase assay plus gain/loss-of-function in disease model, single lab\",\n      \"pmids\": [\"33549119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADRB3 promotes breast cancer cell proliferation and inhibits transdifferentiation into adipocyte-like cells by activating the mTOR pathway; it also promotes MDSC expansion through stimulation of bone marrow mobilization and inhibition of myeloid cell differentiation. ADRB3-knockout PyMT mice show impaired mammary tumorigenesis and reduced pulmonary metastasis.\",\n      \"method\": \"ADRB3 KO PyMT mouse model, immunohistochemistry, in vitro proliferation and differentiation assays, MDSC flow cytometry, pathway analysis (mTOR)\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO mouse model with tumor phenotype plus in vitro pathway identification, single lab\",\n      \"pmids\": [\"35145073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Swertiamarin (STM) directly interacts with ADRB3 and activates ADRB3/UCP1 thermogenic signaling in adipocytes, increasing glucose uptake, glycerol release, p-HSL expression, mitochondrial content, and oxidative phosphorylation; these effects are reversed by ADRB3 inhibition, placing ADRB3 upstream of UCP1-mediated thermogenesis.\",\n      \"method\": \"In vivo HFD/STZ T2DM mouse model, 3T3-L1 adipocyte differentiation, ADRB3 inhibitor treatment, Western blot, bioinformatics, metabolic measurements\",\n      \"journal\": \"Phytomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological inhibition with multiple downstream readouts, single lab\",\n      \"pmids\": [\"39515102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In the SCN-regulated thermogenic circuit, ADRB3 activation in brown adipocytes drives upregulation of S100B, a calcium-binding protein; S100B in turn promotes brown adipocyte proliferation, suppresses senescence, and sustains BAT thermogenesis. S100B is both necessary and sufficient for thermogenesis downstream of ADRB3, establishing a SCN→sympathetic tone→ADRB3→cAMP→S100B signaling axis.\",\n      \"method\": \"SCN lesioning, circadian arrhythmia models, NMDA excitotoxicity, Caspase-3 ablation, in vivo ADRB3 agonist administration, S100B functional studies (necessity and sufficiency), indirect calorimetry\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple SCN disruption models converge on same effector with necessity/sufficiency functional validation, single study\",\n      \"pmids\": [\"41343575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"WWP1 (a HECT-type E3 ubiquitin ligase) suppresses Adrb3 mRNA expression in white adipose tissue under obese conditions; Wwp1 knockout in mice increases Adrb3 expression and phosphorylated hormone-sensitive lipase (p-HSL) levels, promoting lipolysis independently of noradrenaline metabolism, indicating WWP1 is an upstream negative regulator of ADRB3-dependent lipolysis.\",\n      \"method\": \"Wwp1 knockout mice on high-fat diet, RT-qPCR, Western blot for p-HSL, noradrenaline measurement in WAT\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined molecular readouts (mRNA, p-HSL), single lab, moderate evidence\",\n      \"pmids\": [\"40362456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Acute alcohol binge activates sympathetic nerve-ADRB3 signaling in white adipose tissue, driving lipolysis and free fatty acid release that contributes to alcoholic hepatic steatosis and liver injury; fat-specific Adrb3 knockout (Adrb3 FKO) mice are protected from alcohol-induced adipose lipolysis, hepatic fat accumulation, and liver damage.\",\n      \"method\": \"Single alcohol binge model, 6-OHDA sympathetic nerve ablation (systemic and local), fat-specific Adrb3 KO mice, measurement of WAT norepinephrine, plasma FFA, liver histology\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with multiple phenotypic readouts and sympathetic ablation validation; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KLF7 is required for ADRB3-induced IL-6 production in brown adipocytes during stress; ADRB3 activation triggers cAMP-PKA-CREB signaling, CREB binds the KLF7 promoter to induce its transcription, and KLF7 then drives IL-6 expression. Klf7 adipocyte knockout mice show impaired stress-induced IL-6 release.\",\n      \"method\": \"Klf7 adipocyte-specific knockout mice, ADRB3 agonist administration in vivo, in vitro brown adipocyte culture with PKA/CREB inhibitors, CREB ChIP on KLF7 promoter, IL-6 ELISA\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vivo KO plus in vitro mechanistic dissection with ChIP, multiple inhibitor experiments, and pathway reconstitution\",\n      \"pmids\": [\"41565113\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADRB3 is a Gs-coupled adrenergic receptor predominantly expressed in adipose tissue (brown and white), myometrium, and placental vasculature that signals through cAMP-PKA-CREB to regulate lipolysis, thermogenesis (via UCP1), and smooth muscle relaxation; in brown adipocytes it controls an endocrine program that suppresses exosomal iNOS to protect the heart and drives a KLF7-dependent IL-6 secretion axis during stress, while in white adipose tissue sympathetic nerve-released norepinephrine activates ADRB3 to stimulate hormone-sensitive lipase-dependent lipolysis—a process negatively regulated upstream by the E3 ubiquitin ligase WWP1 and gated by the SCN circadian clock through an ADRB3-S100B signaling module.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ADRB3 is a Gs-coupled β3-adrenergic receptor that transduces sympathetic catecholamine signals into cAMP-dependent responses across adipose, reproductive, vascular, and immune tissues, governing lipolysis, thermogenesis, smooth muscle relaxation, and endocrine communication. In brown adipocytes, ADRB3 activation drives cAMP-PKA-CREB signaling to induce UCP1-mediated thermogenesis via an S100B effector arm, suppresses exosomal iNOS release that otherwise promotes cardiac remodeling, and engages a KLF7-dependent transcriptional program for stress-induced IL-6 secretion [PMID:35652349, PMID:41343575, PMID:41565113, PMID:39515102]. In white adipose tissue, sympathetic norepinephrine activates ADRB3 to stimulate hormone-sensitive lipase-dependent lipolysis, a pathway negatively regulated by the E3 ubiquitin ligase WWP1 and gated by suprachiasmatic nucleus circadian output [PMID:40362456, PMID:41343575]. In human myometrium and placental vasculature, ADRB3 mediates cAMP-dependent smooth muscle relaxation, resists agonist-induced desensitization, and exerts anti-apoptotic and anti-inflammatory effects, with its protein expression reduced in preeclampsia [PMID:17570158, PMID:17989355, PMID:16177222].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that ADRB3 is functionally active in human placental vasculature established it as a cAMP-coupled vasorelaxant receptor outside classical adipose contexts, and revealed that preeclampsia selectively reduces its protein without altering mRNA.\",\n      \"evidence\": \"Pharmacological relaxation of human placental artery rings with selective agonists, cAMP quantification, Western blot, and RT-PCR\",\n      \"pmids\": [\"16177222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of post-transcriptional ADRB3 protein downregulation in preeclampsia not identified\", \"Downstream effectors of cAMP-mediated vasorelaxation not delineated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that ADRB3 is the predominant β-adrenoceptor in human myometrium and mediates desensitization-resistant relaxation reframed it as a tocolytic target, while a parallel study demonstrated ADRB3 agonism prevents LPS-induced apoptosis and cytokine release, linking ADRB3 to anti-inflammatory and anti-apoptotic signaling in reproductive tissue.\",\n      \"evidence\": \"Human myometrial strip contraction assays, cAMP measurements, RT-PCR, pharmacological blockade; LPS-stimulated myometrial explants with Western blot, immunostaining, and caspase-3/BAX/BCL2 analysis\",\n      \"pmids\": [\"17570158\", \"17989355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular pathway from cAMP to apoptosis suppression not fully dissected\", \"Whether desensitization resistance is unique to myometrium or a general ADRB3 property remains untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Using Adrb3-knockout mice to show the receptor is required for the antidepressant-like behavioral effects of the selective agonist amibegron extended ADRB3 function into the central nervous system.\",\n      \"evidence\": \"Adrb3 KO mice in chronic mild stress paradigm with pharmacological challenge\",\n      \"pmids\": [\"19744528\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Brain region and cell type expressing functional ADRB3 not identified\", \"Downstream signaling mediating behavioral effect unknown\", \"Single behavioral paradigm from one lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Reconstituting missense ADRB3 variants (Ser165Pro, Ser257Pro) in two cell lines showed that specific residues are required for cAMP signaling without affecting surface trafficking, providing a structure-function map of the receptor.\",\n      \"evidence\": \"Site-directed mutagenesis with stable expression in HEK293 and CHO-K1 cells, cAMP assay, confocal microscopy\",\n      \"pmids\": [\"23640967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model explaining how these residues affect G-protein coupling\", \"Physiological consequences of these variants in vivo not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying ADRB3 as the receptor through which norepinephrine inhibits MSC migration and osteogenic differentiation revealed a non-metabolic role for sympathetic-ADRB3 signaling in bone biology.\",\n      \"evidence\": \"siRNA knockdown of Adrb3 in MSCs plus in vivo sympathetic denervation in rat mandibular distraction model\",\n      \"pmids\": [\"25144690\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ADRB3 is the sole adrenergic receptor on MSCs mediating these effects is not excluded\", \"Direct downstream signaling from ADRB3 in MSCs not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Validating miR-18a as a direct negative regulator of ADRB3 mRNA, itself suppressed by HDAC3, established an epigenetic–post-transcriptional axis (HDAC3→miR-18a→ADRB3) that upregulates ADRB3 in heart failure and promotes cardiac hypertrophy.\",\n      \"evidence\": \"Dual luciferase reporter assay confirming miR-18a–ADRB3 3′UTR interaction; gain/loss-of-function in HF mouse model with Western blot, TUNEL, flow cytometry\",\n      \"pmids\": [\"33549119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ADRB3 upregulation is causative or correlative in heart failure progression not directly tested by rescue\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Brown adipocyte-specific ADRB3 knockout revealed that ADRB3 suppresses exosomal iNOS release; loss of this suppression drives cardiac fibroblast dysfunction, hypertrophy, and fibrosis, establishing a brown fat–heart endocrine axis mediated by exosomes.\",\n      \"evidence\": \"Conditional Adrb3 KO in brown adipocytes, Ang II cardiac stress model, exosome isolation and intravenous injection, iNOS knockdown rescue, cardiac functional assessment\",\n      \"pmids\": [\"35652349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ADRB3 signaling controls iNOS loading into exosomes not resolved\", \"Whether this axis operates in humans unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that ADRB3 knockout in PyMT mice impairs mammary tumorigenesis and metastasis, and that ADRB3 promotes tumor cell proliferation via mTOR and MDSC expansion, extended receptor function into cancer immunobiology.\",\n      \"evidence\": \"ADRB3 KO PyMT mouse model, proliferation/differentiation assays, MDSC quantification by flow cytometry\",\n      \"pmids\": [\"35145073\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ADRB3 acts cell-autonomously in tumor cells versus through the immune microenvironment not fully separated\", \"Mechanism linking ADRB3 to mTOR activation not delineated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Pharmacological and genetic evidence placed ADRB3 upstream of UCP1-mediated thermogenesis in adipocytes, with swertiamarin identified as a direct ADRB3-binding agonist that drives glucose uptake, lipolysis (p-HSL), and mitochondrial biogenesis.\",\n      \"evidence\": \"HFD/STZ T2DM mouse model, 3T3-L1 adipocytes with ADRB3 inhibitor reversal, Western blot, metabolic measurements\",\n      \"pmids\": [\"39515102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding site and affinity of swertiamarin for ADRB3 not structurally characterized\", \"Relative contribution of ADRB3 versus other adrenergic receptors in this model not fully excluded\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Integrating SCN lesioning with ADRB3 agonist studies identified S100B as both necessary and sufficient for ADRB3-driven brown adipocyte thermogenesis, embedding ADRB3 within a circadian clock–sympathetic–BAT circuit (SCN→sympathetic tone→ADRB3→cAMP→S100B).\",\n      \"evidence\": \"SCN lesioning, circadian arrhythmia models, in vivo ADRB3 agonist, S100B necessity/sufficiency experiments, indirect calorimetry\",\n      \"pmids\": [\"41343575\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional or post-translational mechanism linking cAMP to S100B upregulation not defined\", \"Whether S100B acts cell-autonomously or through paracrine signaling not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Two concurrent studies clarified upstream regulators and downstream effectors of ADRB3 in adipose tissue: WWP1 was shown to suppress Adrb3 mRNA to limit lipolysis in WAT, while KLF7 was identified as a CREB-induced transcription factor required for ADRB3-stimulated IL-6 secretion from brown adipocytes during stress.\",\n      \"evidence\": \"Wwp1 KO mice on HFD with RT-qPCR and p-HSL Western blot; Klf7 adipocyte-specific KO mice with ADRB3 agonist, CREB ChIP on KLF7 promoter, PKA/CREB inhibitors, IL-6 ELISA\",\n      \"pmids\": [\"40362456\", \"41565113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which WWP1 suppresses Adrb3 transcription (direct ubiquitination of a transcription factor?) unknown\", \"Whether the KLF7–IL-6 axis operates in human brown fat not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for ADRB3's resistance to desensitization, the mechanisms controlling exosomal iNOS packaging, and the identity of WWP1's substrate that controls Adrb3 transcription remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of human ADRB3 in active or inactive state\", \"Mechanism of desensitization resistance not molecularly defined\", \"Direct ubiquitination target of WWP1 upstream of Adrb3 unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 2, 3, 4, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 4, 9, 10, 13]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"UCP1\",\n      \"KLF7\",\n      \"S100B\",\n      \"WWP1\",\n      \"HSL\",\n      \"iNOS\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}