{"gene":"ADRA1B","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":2006,"finding":"Double knockout of cardiac alpha1A (Adra1a) and alpha1B (Adra1b) adrenergic receptors in mice worsened dilated cardiomyopathy after pressure overload (transverse aortic constriction), with increased interstitial fibrosis, increased apoptosis, failed induction of fetal hypertrophic genes, and desensitized beta-ARs. Before TAC, isolated KO myocytes were more susceptible to apoptosis after oxidative and beta-AR stimulation, indicating that alpha1-AR signaling (including ADRA1B) is required for cardiac adaptive responses to pressure overload.","method":"Double-KO mouse model, transverse aortic constriction, histology, echocardiography, isolated cardiomyocyte apoptosis assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular phenotype and multiple orthogonal readouts, but ADRA1A and ADRA1B are knocked out together so individual contribution of ADRA1B cannot be fully separated","pmids":["16585965"],"is_preprint":false},{"year":2007,"finding":"The ADRA1B promoter is frequently methylated in gastric cancer (70.6% of cases), and this aberrant promoter methylation is associated with reduced ADRA1B mRNA expression in 91.7% of gastric cancers with reduced expression, identifying promoter methylation as an epigenetic mechanism silencing ADRA1B in gastric cancer.","method":"Methylation-sensitive representational difference analysis (MS-RDA), bisulfite sequencing, RT-PCR","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (MS-RDA and RT-PCR) in paired tumor/normal samples from a single lab","pmids":["17242706"],"is_preprint":false},{"year":2014,"finding":"In human embryonic stem cell-derived cardiomyocytes (hESC-CMs), ADRA1B is upregulated and its signaling is intact, mediating hypertrophic responses to the alpha1-AR agonist phenylephrine. In contrast, hiPSC-CMs show upregulation of ADRA1B but defective ADRA1B signaling due to tonic activity of inhibitory kinase pathways, resulting in failure to mount a hypertrophic response.","method":"Gene expression analysis, pharmacological stimulation, kinase inhibitor experiments in hESC-CMs and hiPSC-CMs","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal methods (expression profiling, pharmacology, kinase pathway interrogation)","pmids":["25418732"],"is_preprint":false},{"year":2015,"finding":"ADRA1B promoter activity is regulated epigenetically: in the mouse medial prefrontal cortex, repeated modafinil treatment increased histone H3 acetylation (H3ac) enrichment at the Adra1b promoter and increased Adra1b mRNA expression, whereas repeated methamphetamine did not produce this effect.","method":"ChIP-qPCR for H3ac at Adra1b promoter, RT-PCR for mRNA, in vivo drug treatment","journal":"Progress in neuro-psychopharmacology & biological psychiatry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single chromatin immunoprecipitation assay at Adra1b promoter in a drug-treatment context with no direct functional follow-up on ADRA1B protein","pmids":["29247759"],"is_preprint":false},{"year":2018,"finding":"Acute modafinil (but not methamphetamine) increased H3ac enrichment specifically at the Adra1b promoter in the mouse medial prefrontal cortex, with D1R and D2R antagonists modulating the overall histone acetylation effects of both drugs, placing dopamine receptor signaling upstream of epigenetic regulation at Adra1b.","method":"ChIP-qPCR for histone acetylation at Adra1b promoter, pharmacological blockade of D1R/D2R, in vivo drug administration","journal":"Progress in neuro-psychopharmacology & biological psychiatry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single ChIP method, indirect epistasis inference; no direct ADRA1B protein functional readout","pmids":["30056065"],"is_preprint":false},{"year":2021,"finding":"Inhibition of Adra1b with terazosin in a mouse model of contrast-induced acute kidney injury (CI-AKI) significantly decreased serum creatinine, urinary KIM-1, HIF-1α, apoptosis, and downstream Adra1b target genes including Ece1, Edn1, and pMAPK14. In HK-2 cells, Adra1b was upregulated by contrast exposure, and its inhibition abrogated Ece1, Edn1, Fsp-1, Mmp-2, Mmp-9 expression and caspase-3/7 activity, defining an Adra1b → Ece1/Edn1 signaling axis in kidney injury.","method":"RNA-seq in mouse kidney, pharmacological inhibition with terazosin in vivo and in vitro, immunohistochemistry, functional apoptosis assays","journal":"Translational research : the journal of laboratory and clinical medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combination of RNA-seq, in vivo pharmacology, and in vitro cell experiments with multiple readouts in a single lab","pmids":["33711514"],"is_preprint":false},{"year":2021,"finding":"SNAP-tagged ADRA1B expressed in HEK293 cells has a protein degradation half-life quantified by cycloheximide-chase assay, and degradation is primarily proteasome-mediated as shown by bortezomib treatment. The half-life for ADRA1A, ADRA1B, and ADRA1D subtypes was quantified and found to range with ADRA1D being the shortest (0.52 h).","method":"SNAP-epitope tag/NIR imaging CHX-chase assay, proteasome inhibitor bortezomib treatment, 96-well plate format","journal":"SLAS discovery : advancing life sciences R & D","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct quantitative degradation assay with pharmacological validation of proteasome involvement; single lab but multiple receptor subtypes compared with orthogonal formats","pmids":["33402011"],"is_preprint":false},{"year":2022,"finding":"Human airway smooth muscle (HASM) cells express a high abundance of ADRA1B (the alpha1B adrenergic receptor subtype). Upon beta2-AR desensitization or pharmacological beta2-AR blockade, ADRA1B activation by epinephrine evokes intracellular calcium mobilization, myosin light chain phosphorylation, and HASM cell shortening (bronchoconstriction). This pro-contractile effect was abrogated by the alpha1-AR antagonist doxazosin mesylate.","method":"Receptor expression profiling, calcium imaging, myosin light chain phosphorylation assay, cell shortening mechanics, pharmacological blockade with doxazosin","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal functional assays (calcium, MLC phosphorylation, cell shortening) with pharmacological validation in human primary cells; single lab but convergent methods","pmids":["35787178"],"is_preprint":false},{"year":2023,"finding":"GPR143 (the L-DOPA receptor) functionally couples with ADRA1B through its second transmembrane (TM2) domain. Co-expression of GPR143 augments phenylephrine-induced ERK phosphorylation via ADRA1B in HEK293T cells. Immunoprecipitation confirmed a physical interaction between GPR143 and ADRA1B, and a synthetic TAT-TM2 peptide that disrupts this interaction suppressed GPR143-mediated potentiation of ADRA1B signaling.","method":"Co-immunoprecipitation, ERK phosphorylation assay, chimeric receptor analysis, TAT-fused TM2 peptide disruption experiment in HEK293T cells","journal":"Biological & pharmaceutical bulletin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional disruption with TM2 peptide, single lab, two orthogonal methods","pmids":["37394637"],"is_preprint":false},{"year":2023,"finding":"Genetic knockout of ADRA1B or its pharmacological blockade with alpha1/alpha1B antagonists selectively sensitizes MYCN-amplified neuroblastoma cells to cell viability reduction and neural differentiation induced by isotretinoin (13-cis retinoic acid). ADRA1B expression was upregulated by the synergistic compound isorhamnetin. In vivo, doxazosin combined with 13-cis retinoic acid markedly controlled tumor growth in neuroblastoma xenograft mice.","method":"Genetic KO of ADRA1B, pharmacological antagonism (doxazosin), cell viability assays, differentiation assays, xenograft mouse model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO and pharmacological inhibition converge on same phenotype; validated in vivo in xenograft model; multiple orthogonal methods across cell lines and in vivo","pmids":["37289021"],"is_preprint":false},{"year":2023,"finding":"ADRA1B is the dominant sympathetic neurotransmitter receptor expressed in human dental pulp stem cells (hDPSCs), as identified by RNA-sequencing. Sympathetic nervous system activation through ADRA1B inhibits proliferation and migration of hDPSCs via metabolic reprogramming (shift from oxidative phosphorylation to anaerobic glycolysis) and through crosstalk with serine-threonine kinase and p38 MAPK signaling pathways.","method":"RNA-sequencing for receptor identification, Seahorse metabolic assay, ATP/lactate assays, Transwell and wound healing assays, cell cycle analysis, ADRA1B manipulation in hDPSCs","journal":"Journal of endodontics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq for receptor identification plus multiple metabolic and functional assays; single lab, convergent methods","pmids":["37769871"],"is_preprint":false},{"year":2024,"finding":"Hepatocyte-specific deletion of Adra1b in female mice exacerbated diet-induced obesity, insulin resistance, and glucose intolerance, and was accompanied by reduced hepatic gluconeogenic capacity and reprogramming of gonadal adipose tissue with hyperleptinemia. The effect was sex-dependent: male mice with hepatic Adra1b deletion showed no significant metabolic impact, demonstrating a sex-specific role for liver ADRA1B in energy and glucose homeostasis.","method":"CRISPR-Cas9 hepatocyte-specific Adra1b knockout mouse model, glucose/insulin tolerance tests, metabolic phenotyping, gene expression analysis","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific genetic KO with rigorous metabolic phenotyping and multiple readouts; single lab but CRISPR-validated model with convergent metabolic data","pmids":["39259165"],"is_preprint":false},{"year":2025,"finding":"Hepatocyte-specific Adra1b knockout (Adra1bLKO) mice fed a MASLD-inducing diet exhibited significantly increased hepatic inflammation (elevated TNF, IL-1b, MCP-1, IL-6) and activation of hepatic stellate cells (elevated TGF-β and alpha-SMA/Acta2), without changes in steatosis, body weight, glucose tolerance, or insulin sensitivity. This identifies ADRA1B as a restraint on hepatic inflammatory and fibrotic responses in MASLD.","method":"Hepatocyte-specific Adra1b knockout mouse model, automated histological image analysis (MorphoQuant), gene expression (qPCR), cytokine protein quantification, metabolic phenotyping","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple orthogonal readouts (histology, transcriptomics, protein cytokines); converges with and extends the 2024 hepatic ADRA1B study from the same group","pmids":["41087030"],"is_preprint":false},{"year":2025,"finding":"ADRA1B activation by adrenergic signaling inhibits odontoblast differentiation of human dental pulp stem cells (hDPSCs) by suppressing mitochondrial metabolism via PGC-1α. In vivo, sympathectomy (superior cervical ganglionectomy) enhanced dentine formation in a rat pulp-capping model, and mesenchymal cell-specific Adra1b ablation (Adra1bflox/flox;Prx1-cre mice) led to increased odontoblast differentiation and tertiary dentine formation.","method":"ADRA1B overexpression/knockdown in hDPSCs, OCR measurement (Seahorse), ALP activity, alizarin red S staining, DSPP/DMP1 expression; in vivo rat sympathectomy model; conditional Adra1b KO mouse model","journal":"International endodontic journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — convergent in vitro (gain/loss-of-function) and two independent in vivo models (rat sympathectomy + conditional KO mouse) with mechanistic link to PGC-1α/mitochondrial metabolism","pmids":["40660609"],"is_preprint":false}],"current_model":"ADRA1B is a Gq-coupled alpha-1B adrenergic receptor that mediates sympathetic nervous system signaling in multiple tissues: in the heart it is required for adaptive responses to pressure overload (preventing fibrosis and apoptosis); in airway smooth muscle it drives bronchoconstriction via calcium mobilization and myosin light chain phosphorylation upon beta2-AR desensitization; in the liver (hepatocytes) it restrains inflammatory responses and regulates sex-dependent glucose and energy homeostasis; in dental pulp stem cells it suppresses proliferation, migration, and odontoblast differentiation by shifting mitochondrial metabolism via PGC-1α; in neuroblastoma it promotes survival and opposes retinoid-induced differentiation; it physically interacts with GPR143 through a TM2 interface that potentiates ADRA1B-mediated ERK signaling; and its gene is epigenetically silenced by promoter methylation in gastric cancer and activated by histone H3 acetylation in prefrontal cortex in response to modafinil."},"narrative":{"mechanistic_narrative":"ADRA1B is a Gq-coupled alpha-1B adrenergic receptor that transduces sympathetic catecholamine signaling into cell-type-specific responses across heart, airway, liver, neural, and dental tissues [PMID:35787178, PMID:39259165, PMID:40660609]. In human airway smooth muscle, where it is highly expressed, ADRA1B activation by epinephrine—unmasked when beta2-AR is desensitized or blocked—drives intracellular calcium mobilization, myosin light chain phosphorylation, and cell shortening, producing bronchoconstriction that is reversed by alpha1-AR antagonism [PMID:35787178]. In the heart, alpha1-AR signaling including ADRA1B is required for adaptive responses to pressure overload, protecting against fibrosis and cardiomyocyte apoptosis [PMID:16585965]. In hepatocytes, ADRA1B acts as a restraint on metabolic and inflammatory dysfunction: its sex-dependent loss in female mice exacerbates diet-induced obesity, insulin resistance, and impaired gluconeogenesis [PMID:39259165], and its deletion worsens hepatic inflammation and stellate cell activation in MASLD [PMID:41087030]. In human dental pulp stem cells, where it is the dominant sympathetic receptor, ADRA1B suppresses proliferation, migration, and odontoblast differentiation by reprogramming mitochondrial metabolism toward glycolysis via PGC-1alpha, an effect confirmed in vivo by sympathectomy and conditional knockout that both enhance dentine formation [PMID:37769871, PMID:40660609]. ADRA1B also promotes survival in MYCN-amplified neuroblastoma, where its genetic or pharmacological inhibition sensitizes cells to retinoid-induced differentiation and controls xenograft growth [PMID:37289021]. Mechanistically, ADRA1B physically associates with GPR143 through a TM2 interface that potentiates ADRA1B-mediated ERK signaling [PMID:37394637], and receptor levels are controlled both by proteasome-mediated turnover [PMID:33402011] and by epigenetic regulation of its promoter—silencing via methylation in gastric cancer and activation via histone H3 acetylation in prefrontal cortex [PMID:17242706, PMID:29247759].","teleology":[{"year":2006,"claim":"Established that cardiac alpha1-AR signaling, including ADRA1B, is not dispensable but actively required for adaptive cardiac remodeling under hemodynamic stress.","evidence":"Double Adra1a/Adra1b knockout mice subjected to transverse aortic constriction with histology, echocardiography, and cardiomyocyte apoptosis assays","pmids":["16585965"],"confidence":"Medium","gaps":["ADRA1A and ADRA1B knocked out together, so the individual contribution of ADRA1B cannot be isolated","the downstream signaling cascade protecting against apoptosis was not defined"]},{"year":2007,"claim":"Identified promoter methylation as an epigenetic mechanism that silences ADRA1B expression, linking receptor loss to cancer.","evidence":"Methylation-sensitive representational difference analysis, bisulfite sequencing, and RT-PCR in paired gastric tumor/normal samples","pmids":["17242706"],"confidence":"Medium","gaps":["functional consequence of ADRA1B loss for gastric tumor biology not tested","no causal demethylation rescue experiment"]},{"year":2014,"claim":"Showed that ADRA1B signaling competence, not merely expression, governs hypertrophic responsiveness in stem-cell-derived cardiomyocytes.","evidence":"Expression profiling, phenylephrine stimulation, and kinase inhibitor experiments in hESC-CMs versus hiPSC-CMs","pmids":["25418732"],"confidence":"Medium","gaps":["the specific inhibitory kinases blocking ADRA1B signaling in hiPSC-CMs not identified","relevance to in vivo adult cardiomyocyte signaling unclear"]},{"year":2018,"claim":"Placed dopamine receptor signaling upstream of histone-acetylation-based epigenetic control of the Adra1b promoter in cortical tissue.","evidence":"ChIP-qPCR for H3 acetylation at the Adra1b promoter with D1R/D2R pharmacological blockade after in vivo modafinil or methamphetamine (consolidates 2015 and 2018 findings)","pmids":["29247759","30056065"],"confidence":"Low","gaps":["single ChIP method with no direct functional readout on ADRA1B protein or downstream signaling","epistasis inferred indirectly via antagonists","behavioral or physiological consequence not established"]},{"year":2021,"claim":"Quantified ADRA1B protein stability and demonstrated that proteasome-mediated turnover sets receptor half-life.","evidence":"SNAP-tag NIR-imaging cycloheximide-chase assay with bortezomib in HEK293 cells across alpha1-AR subtypes","pmids":["33402011"],"confidence":"Medium","gaps":["E3 ligase and degron mediating ADRA1B turnover not identified","whether agonist activation alters degradation kinetics untested"]},{"year":2021,"claim":"Defined an ADRA1B-to-Ece1/Edn1 signaling axis driving contrast-induced kidney injury, establishing ADRA1B as a pharmacological target via terazosin.","evidence":"Kidney RNA-seq, terazosin inhibition in vivo and in HK-2 cells, immunohistochemistry, and apoptosis assays","pmids":["33711514"],"confidence":"Medium","gaps":["receptor specificity of terazosin not controlled by genetic knockout","mechanism linking ADRA1B to endothelin gene induction not resolved"]},{"year":2022,"claim":"Demonstrated that ADRA1B mediates bronchoconstriction in human airway smooth muscle when beta2-AR braking is lost, explaining paradoxical adrenergic contraction.","evidence":"Receptor profiling, calcium imaging, MLC phosphorylation, cell shortening mechanics, and doxazosin blockade in human primary airway smooth muscle cells","pmids":["35787178"],"confidence":"High","gaps":["in vivo airway physiological relevance not directly tested","the desensitization signal that unmasks ADRA1B not mapped"]},{"year":2023,"claim":"Revealed that ADRA1B physically couples with GPR143 through a TM2 interface to amplify ERK signaling, adding an allosteric layer of receptor regulation.","evidence":"Reciprocal co-immunoprecipitation, ERK phosphorylation assays, chimeric receptors, and TAT-TM2 disrupting peptide in HEK293T cells","pmids":["37394637"],"confidence":"Medium","gaps":["interaction shown in overexpression system, not endogenous tissue","physiological context where GPR143-ADRA1B coupling operates unknown"]},{"year":2023,"claim":"Established ADRA1B as a pro-survival, anti-differentiation factor in MYCN-amplified neuroblastoma and a tractable combination target with retinoids.","evidence":"Genetic ADRA1B knockout, doxazosin antagonism, viability and differentiation assays, and xenograft model with 13-cis retinoic acid","pmids":["37289021"],"confidence":"High","gaps":["downstream survival signaling opposing retinoid differentiation not defined","endogenous ligand driving ADRA1B in the tumor not identified"]},{"year":2023,"claim":"Identified ADRA1B as the dominant sympathetic receptor in dental pulp stem cells that suppresses proliferation and migration via metabolic reprogramming.","evidence":"RNA-seq, Seahorse and ATP/lactate metabolic assays, migration and cell cycle assays with ADRA1B manipulation in hDPSCs","pmids":["37769871"],"confidence":"Medium","gaps":["link between Gq signaling and the glycolytic shift mechanistically incomplete","in vivo validation provided only by later study"]},{"year":2024,"claim":"Demonstrated a sex-specific hepatic role for ADRA1B in glucose and energy homeostasis through tissue-specific genetics.","evidence":"CRISPR-Cas9 hepatocyte-specific Adra1b knockout in female and male mice with glucose/insulin tolerance tests and metabolic phenotyping","pmids":["39259165"],"confidence":"High","gaps":["molecular basis of sex dimorphism not resolved","direct hepatocyte signaling driving gluconeogenic capacity not mapped"]},{"year":2025,"claim":"Extended hepatic ADRA1B function to show it restrains inflammation and fibrosis in MASLD independent of steatosis or systemic metabolism.","evidence":"Hepatocyte-specific Adra1b knockout on MASLD diet with histology, qPCR, and cytokine protein quantification","pmids":["41087030"],"confidence":"High","gaps":["intracellular pathway by which ADRA1B suppresses cytokine production unresolved","whether the effect is cell-autonomous to hepatocytes or via stellate-cell crosstalk not dissected"]},{"year":2025,"claim":"Confirmed in vivo that ADRA1B suppresses odontoblast differentiation by inhibiting PGC-1alpha-dependent mitochondrial metabolism, linking sympathetic tone to dentine formation.","evidence":"Gain/loss-of-function in hDPSCs with OCR and differentiation assays, rat sympathectomy pulp-capping model, and Adra1bflox/flox;Prx1-cre conditional knockout mice","pmids":["40660609"],"confidence":"High","gaps":["mechanism coupling ADRA1B Gq signaling to PGC-1alpha repression not defined","clinical relevance to human dentine regeneration untested"]},{"year":null,"claim":"How a single Gq-coupled receptor produces divergent, tissue-specific outcomes—protective in heart and liver, pro-pathologic in airway, neuroblastoma, and dental pulp—remains unresolved at the level of distinct downstream effector wiring.","evidence":"","pmids":[],"confidence":"Low","gaps":["no unified map linking ADRA1B to specific second-messenger and kinase outputs per cell type","endogenous ligands and receptor partners in each context incompletely defined","structural basis of the GPR143 TM2 interaction not solved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[7,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,8]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[11,13]}],"complexes":[],"partners":["GPR143"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P35368","full_name":"Alpha-1B adrenergic receptor","aliases":["Alpha-1B adrenoreceptor","Alpha-1B adrenoceptor"],"length_aa":520,"mass_kda":56.8,"function":"Alpha-1 adrenergic receptors are G protein-coupled receptors for catecholamines that signal through the G(q) family of G proteins, including G(q) and G(11). Upon activation, they stimulate the phosphatidylinositol-calcium second messenger pathway, leading to calcium release from intracellular stores and activation of protein kinase C (By similarity). ADRA1B binds the catecholamine ligands norepinephrine and epinephrine (PubMed:7815325, PubMed:8183249). Can also couple to G(14) and G(16) proteins (By similarity). Nuclear ADRA1B forms heterooligomers with ADRA1A to regulate phenylephrine(PE)-stimulated ERK signaling in cardiac myocytes (PubMed:18802028, PubMed:22120526). At the plasma membrane, ADRA1B interacts with CAVIN4/MURC to regulates ERK activation in cardiomyocytes, contributing to the regulation of cardiac hypertrophy (PubMed:24567387)","subcellular_location":"Nucleus membrane; Cell membrane; Cytoplasm; Membrane, caveola","url":"https://www.uniprot.org/uniprotkb/P35368/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ADRA1B","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ADRA1B","total_profiled":1310},"omim":[{"mim_id":"190196","title":"TRANSGLUTAMINASE 2; TGM2","url":"https://www.omim.org/entry/190196"},{"mim_id":"147263","title":"INOSITOL POLYPHOSPHATE-1-PHOSPHATASE; INPP1","url":"https://www.omim.org/entry/147263"},{"mim_id":"126449","title":"DOPAMINE RECEPTOR D1; DRD1","url":"https://www.omim.org/entry/126449"},{"mim_id":"109690","title":"BETA-2-ADRENERGIC RECEPTOR; ADRB2","url":"https://www.omim.org/entry/109690"},{"mim_id":"109630","title":"BETA-1-ADRENERGIC RECEPTOR; ADRB1","url":"https://www.omim.org/entry/109630"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"blood vessel","ntpm":17.2},{"tissue":"liver","ntpm":11.4},{"tissue":"lymphoid tissue","ntpm":10.6}],"url":"https://www.proteinatlas.org/search/ADRA1B"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P35368","domains":[{"cath_id":"1.20.1070.10","chopping":"43-251_278-379","consensus_level":"high","plddt":88.4178,"start":43,"end":379}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P35368","model_url":"https://alphafold.ebi.ac.uk/files/AF-P35368-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P35368-F1-predicted_aligned_error_v6.png","plddt_mean":67.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ADRA1B","jax_strain_url":"https://www.jax.org/strain/search?query=ADRA1B"},"sequence":{"accession":"P35368","fasta_url":"https://rest.uniprot.org/uniprotkb/P35368.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P35368/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P35368"}},"corpus_meta":[{"pmid":"19910028","id":"PMC_19910028","title":"A genome-wide association study on 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Before TAC, isolated KO myocytes were more susceptible to apoptosis after oxidative and beta-AR stimulation, indicating that alpha1-AR signaling (including ADRA1B) is required for cardiac adaptive responses to pressure overload.\",\n      \"method\": \"Double-KO mouse model, transverse aortic constriction, histology, echocardiography, isolated cardiomyocyte apoptosis assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular phenotype and multiple orthogonal readouts, but ADRA1A and ADRA1B are knocked out together so individual contribution of ADRA1B cannot be fully separated\",\n      \"pmids\": [\"16585965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The ADRA1B promoter is frequently methylated in gastric cancer (70.6% of cases), and this aberrant promoter methylation is associated with reduced ADRA1B mRNA expression in 91.7% of gastric cancers with reduced expression, identifying promoter methylation as an epigenetic mechanism silencing ADRA1B in gastric cancer.\",\n      \"method\": \"Methylation-sensitive representational difference analysis (MS-RDA), bisulfite sequencing, RT-PCR\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (MS-RDA and RT-PCR) in paired tumor/normal samples from a single lab\",\n      \"pmids\": [\"17242706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In human embryonic stem cell-derived cardiomyocytes (hESC-CMs), ADRA1B is upregulated and its signaling is intact, mediating hypertrophic responses to the alpha1-AR agonist phenylephrine. In contrast, hiPSC-CMs show upregulation of ADRA1B but defective ADRA1B signaling due to tonic activity of inhibitory kinase pathways, resulting in failure to mount a hypertrophic response.\",\n      \"method\": \"Gene expression analysis, pharmacological stimulation, kinase inhibitor experiments in hESC-CMs and hiPSC-CMs\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal methods (expression profiling, pharmacology, kinase pathway interrogation)\",\n      \"pmids\": [\"25418732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ADRA1B promoter activity is regulated epigenetically: in the mouse medial prefrontal cortex, repeated modafinil treatment increased histone H3 acetylation (H3ac) enrichment at the Adra1b promoter and increased Adra1b mRNA expression, whereas repeated methamphetamine did not produce this effect.\",\n      \"method\": \"ChIP-qPCR for H3ac at Adra1b promoter, RT-PCR for mRNA, in vivo drug treatment\",\n      \"journal\": \"Progress in neuro-psychopharmacology & biological psychiatry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single chromatin immunoprecipitation assay at Adra1b promoter in a drug-treatment context with no direct functional follow-up on ADRA1B protein\",\n      \"pmids\": [\"29247759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Acute modafinil (but not methamphetamine) increased H3ac enrichment specifically at the Adra1b promoter in the mouse medial prefrontal cortex, with D1R and D2R antagonists modulating the overall histone acetylation effects of both drugs, placing dopamine receptor signaling upstream of epigenetic regulation at Adra1b.\",\n      \"method\": \"ChIP-qPCR for histone acetylation at Adra1b promoter, pharmacological blockade of D1R/D2R, in vivo drug administration\",\n      \"journal\": \"Progress in neuro-psychopharmacology & biological psychiatry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single ChIP method, indirect epistasis inference; no direct ADRA1B protein functional readout\",\n      \"pmids\": [\"30056065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Inhibition of Adra1b with terazosin in a mouse model of contrast-induced acute kidney injury (CI-AKI) significantly decreased serum creatinine, urinary KIM-1, HIF-1α, apoptosis, and downstream Adra1b target genes including Ece1, Edn1, and pMAPK14. In HK-2 cells, Adra1b was upregulated by contrast exposure, and its inhibition abrogated Ece1, Edn1, Fsp-1, Mmp-2, Mmp-9 expression and caspase-3/7 activity, defining an Adra1b → Ece1/Edn1 signaling axis in kidney injury.\",\n      \"method\": \"RNA-seq in mouse kidney, pharmacological inhibition with terazosin in vivo and in vitro, immunohistochemistry, functional apoptosis assays\",\n      \"journal\": \"Translational research : the journal of laboratory and clinical medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combination of RNA-seq, in vivo pharmacology, and in vitro cell experiments with multiple readouts in a single lab\",\n      \"pmids\": [\"33711514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SNAP-tagged ADRA1B expressed in HEK293 cells has a protein degradation half-life quantified by cycloheximide-chase assay, and degradation is primarily proteasome-mediated as shown by bortezomib treatment. The half-life for ADRA1A, ADRA1B, and ADRA1D subtypes was quantified and found to range with ADRA1D being the shortest (0.52 h).\",\n      \"method\": \"SNAP-epitope tag/NIR imaging CHX-chase assay, proteasome inhibitor bortezomib treatment, 96-well plate format\",\n      \"journal\": \"SLAS discovery : advancing life sciences R & D\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct quantitative degradation assay with pharmacological validation of proteasome involvement; single lab but multiple receptor subtypes compared with orthogonal formats\",\n      \"pmids\": [\"33402011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human airway smooth muscle (HASM) cells express a high abundance of ADRA1B (the alpha1B adrenergic receptor subtype). Upon beta2-AR desensitization or pharmacological beta2-AR blockade, ADRA1B activation by epinephrine evokes intracellular calcium mobilization, myosin light chain phosphorylation, and HASM cell shortening (bronchoconstriction). This pro-contractile effect was abrogated by the alpha1-AR antagonist doxazosin mesylate.\",\n      \"method\": \"Receptor expression profiling, calcium imaging, myosin light chain phosphorylation assay, cell shortening mechanics, pharmacological blockade with doxazosin\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal functional assays (calcium, MLC phosphorylation, cell shortening) with pharmacological validation in human primary cells; single lab but convergent methods\",\n      \"pmids\": [\"35787178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GPR143 (the L-DOPA receptor) functionally couples with ADRA1B through its second transmembrane (TM2) domain. Co-expression of GPR143 augments phenylephrine-induced ERK phosphorylation via ADRA1B in HEK293T cells. Immunoprecipitation confirmed a physical interaction between GPR143 and ADRA1B, and a synthetic TAT-TM2 peptide that disrupts this interaction suppressed GPR143-mediated potentiation of ADRA1B signaling.\",\n      \"method\": \"Co-immunoprecipitation, ERK phosphorylation assay, chimeric receptor analysis, TAT-fused TM2 peptide disruption experiment in HEK293T cells\",\n      \"journal\": \"Biological & pharmaceutical bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional disruption with TM2 peptide, single lab, two orthogonal methods\",\n      \"pmids\": [\"37394637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Genetic knockout of ADRA1B or its pharmacological blockade with alpha1/alpha1B antagonists selectively sensitizes MYCN-amplified neuroblastoma cells to cell viability reduction and neural differentiation induced by isotretinoin (13-cis retinoic acid). ADRA1B expression was upregulated by the synergistic compound isorhamnetin. In vivo, doxazosin combined with 13-cis retinoic acid markedly controlled tumor growth in neuroblastoma xenograft mice.\",\n      \"method\": \"Genetic KO of ADRA1B, pharmacological antagonism (doxazosin), cell viability assays, differentiation assays, xenograft mouse model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO and pharmacological inhibition converge on same phenotype; validated in vivo in xenograft model; multiple orthogonal methods across cell lines and in vivo\",\n      \"pmids\": [\"37289021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ADRA1B is the dominant sympathetic neurotransmitter receptor expressed in human dental pulp stem cells (hDPSCs), as identified by RNA-sequencing. Sympathetic nervous system activation through ADRA1B inhibits proliferation and migration of hDPSCs via metabolic reprogramming (shift from oxidative phosphorylation to anaerobic glycolysis) and through crosstalk with serine-threonine kinase and p38 MAPK signaling pathways.\",\n      \"method\": \"RNA-sequencing for receptor identification, Seahorse metabolic assay, ATP/lactate assays, Transwell and wound healing assays, cell cycle analysis, ADRA1B manipulation in hDPSCs\",\n      \"journal\": \"Journal of endodontics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq for receptor identification plus multiple metabolic and functional assays; single lab, convergent methods\",\n      \"pmids\": [\"37769871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hepatocyte-specific deletion of Adra1b in female mice exacerbated diet-induced obesity, insulin resistance, and glucose intolerance, and was accompanied by reduced hepatic gluconeogenic capacity and reprogramming of gonadal adipose tissue with hyperleptinemia. The effect was sex-dependent: male mice with hepatic Adra1b deletion showed no significant metabolic impact, demonstrating a sex-specific role for liver ADRA1B in energy and glucose homeostasis.\",\n      \"method\": \"CRISPR-Cas9 hepatocyte-specific Adra1b knockout mouse model, glucose/insulin tolerance tests, metabolic phenotyping, gene expression analysis\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific genetic KO with rigorous metabolic phenotyping and multiple readouts; single lab but CRISPR-validated model with convergent metabolic data\",\n      \"pmids\": [\"39259165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Hepatocyte-specific Adra1b knockout (Adra1bLKO) mice fed a MASLD-inducing diet exhibited significantly increased hepatic inflammation (elevated TNF, IL-1b, MCP-1, IL-6) and activation of hepatic stellate cells (elevated TGF-β and alpha-SMA/Acta2), without changes in steatosis, body weight, glucose tolerance, or insulin sensitivity. This identifies ADRA1B as a restraint on hepatic inflammatory and fibrotic responses in MASLD.\",\n      \"method\": \"Hepatocyte-specific Adra1b knockout mouse model, automated histological image analysis (MorphoQuant), gene expression (qPCR), cytokine protein quantification, metabolic phenotyping\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple orthogonal readouts (histology, transcriptomics, protein cytokines); converges with and extends the 2024 hepatic ADRA1B study from the same group\",\n      \"pmids\": [\"41087030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ADRA1B activation by adrenergic signaling inhibits odontoblast differentiation of human dental pulp stem cells (hDPSCs) by suppressing mitochondrial metabolism via PGC-1α. In vivo, sympathectomy (superior cervical ganglionectomy) enhanced dentine formation in a rat pulp-capping model, and mesenchymal cell-specific Adra1b ablation (Adra1bflox/flox;Prx1-cre mice) led to increased odontoblast differentiation and tertiary dentine formation.\",\n      \"method\": \"ADRA1B overexpression/knockdown in hDPSCs, OCR measurement (Seahorse), ALP activity, alizarin red S staining, DSPP/DMP1 expression; in vivo rat sympathectomy model; conditional Adra1b KO mouse model\",\n      \"journal\": \"International endodontic journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — convergent in vitro (gain/loss-of-function) and two independent in vivo models (rat sympathectomy + conditional KO mouse) with mechanistic link to PGC-1α/mitochondrial metabolism\",\n      \"pmids\": [\"40660609\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADRA1B is a Gq-coupled alpha-1B adrenergic receptor that mediates sympathetic nervous system signaling in multiple tissues: in the heart it is required for adaptive responses to pressure overload (preventing fibrosis and apoptosis); in airway smooth muscle it drives bronchoconstriction via calcium mobilization and myosin light chain phosphorylation upon beta2-AR desensitization; in the liver (hepatocytes) it restrains inflammatory responses and regulates sex-dependent glucose and energy homeostasis; in dental pulp stem cells it suppresses proliferation, migration, and odontoblast differentiation by shifting mitochondrial metabolism via PGC-1α; in neuroblastoma it promotes survival and opposes retinoid-induced differentiation; it physically interacts with GPR143 through a TM2 interface that potentiates ADRA1B-mediated ERK signaling; and its gene is epigenetically silenced by promoter methylation in gastric cancer and activated by histone H3 acetylation in prefrontal cortex in response to modafinil.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ADRA1B is a Gq-coupled alpha-1B adrenergic receptor that transduces sympathetic catecholamine signaling into cell-type-specific responses across heart, airway, liver, neural, and dental tissues [#7, #11, #13]. In human airway smooth muscle, where it is highly expressed, ADRA1B activation by epinephrine—unmasked when beta2-AR is desensitized or blocked—drives intracellular calcium mobilization, myosin light chain phosphorylation, and cell shortening, producing bronchoconstriction that is reversed by alpha1-AR antagonism [#7]. In the heart, alpha1-AR signaling including ADRA1B is required for adaptive responses to pressure overload, protecting against fibrosis and cardiomyocyte apoptosis [#0]. In hepatocytes, ADRA1B acts as a restraint on metabolic and inflammatory dysfunction: its sex-dependent loss in female mice exacerbates diet-induced obesity, insulin resistance, and impaired gluconeogenesis [#11], and its deletion worsens hepatic inflammation and stellate cell activation in MASLD [#12]. In human dental pulp stem cells, where it is the dominant sympathetic receptor, ADRA1B suppresses proliferation, migration, and odontoblast differentiation by reprogramming mitochondrial metabolism toward glycolysis via PGC-1alpha, an effect confirmed in vivo by sympathectomy and conditional knockout that both enhance dentine formation [#10, #13]. ADRA1B also promotes survival in MYCN-amplified neuroblastoma, where its genetic or pharmacological inhibition sensitizes cells to retinoid-induced differentiation and controls xenograft growth [#9]. Mechanistically, ADRA1B physically associates with GPR143 through a TM2 interface that potentiates ADRA1B-mediated ERK signaling [#8], and receptor levels are controlled both by proteasome-mediated turnover [#6] and by epigenetic regulation of its promoter—silencing via methylation in gastric cancer and activation via histone H3 acetylation in prefrontal cortex [#1, #3].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that cardiac alpha1-AR signaling, including ADRA1B, is not dispensable but actively required for adaptive cardiac remodeling under hemodynamic stress.\",\n      \"evidence\": \"Double Adra1a/Adra1b knockout mice subjected to transverse aortic constriction with histology, echocardiography, and cardiomyocyte apoptosis assays\",\n      \"pmids\": [\"16585965\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ADRA1A and ADRA1B knocked out together, so the individual contribution of ADRA1B cannot be isolated\", \"the downstream signaling cascade protecting against apoptosis was not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified promoter methylation as an epigenetic mechanism that silences ADRA1B expression, linking receptor loss to cancer.\",\n      \"evidence\": \"Methylation-sensitive representational difference analysis, bisulfite sequencing, and RT-PCR in paired gastric tumor/normal samples\",\n      \"pmids\": [\"17242706\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"functional consequence of ADRA1B loss for gastric tumor biology not tested\", \"no causal demethylation rescue experiment\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed that ADRA1B signaling competence, not merely expression, governs hypertrophic responsiveness in stem-cell-derived cardiomyocytes.\",\n      \"evidence\": \"Expression profiling, phenylephrine stimulation, and kinase inhibitor experiments in hESC-CMs versus hiPSC-CMs\",\n      \"pmids\": [\"25418732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"the specific inhibitory kinases blocking ADRA1B signaling in hiPSC-CMs not identified\", \"relevance to in vivo adult cardiomyocyte signaling unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed dopamine receptor signaling upstream of histone-acetylation-based epigenetic control of the Adra1b promoter in cortical tissue.\",\n      \"evidence\": \"ChIP-qPCR for H3 acetylation at the Adra1b promoter with D1R/D2R pharmacological blockade after in vivo modafinil or methamphetamine (consolidates 2015 and 2018 findings)\",\n      \"pmids\": [\"29247759\", \"30056065\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"single ChIP method with no direct functional readout on ADRA1B protein or downstream signaling\", \"epistasis inferred indirectly via antagonists\", \"behavioral or physiological consequence not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Quantified ADRA1B protein stability and demonstrated that proteasome-mediated turnover sets receptor half-life.\",\n      \"evidence\": \"SNAP-tag NIR-imaging cycloheximide-chase assay with bortezomib in HEK293 cells across alpha1-AR subtypes\",\n      \"pmids\": [\"33402011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase and degron mediating ADRA1B turnover not identified\", \"whether agonist activation alters degradation kinetics untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined an ADRA1B-to-Ece1/Edn1 signaling axis driving contrast-induced kidney injury, establishing ADRA1B as a pharmacological target via terazosin.\",\n      \"evidence\": \"Kidney RNA-seq, terazosin inhibition in vivo and in HK-2 cells, immunohistochemistry, and apoptosis assays\",\n      \"pmids\": [\"33711514\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"receptor specificity of terazosin not controlled by genetic knockout\", \"mechanism linking ADRA1B to endothelin gene induction not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated that ADRA1B mediates bronchoconstriction in human airway smooth muscle when beta2-AR braking is lost, explaining paradoxical adrenergic contraction.\",\n      \"evidence\": \"Receptor profiling, calcium imaging, MLC phosphorylation, cell shortening mechanics, and doxazosin blockade in human primary airway smooth muscle cells\",\n      \"pmids\": [\"35787178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"in vivo airway physiological relevance not directly tested\", \"the desensitization signal that unmasks ADRA1B not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed that ADRA1B physically couples with GPR143 through a TM2 interface to amplify ERK signaling, adding an allosteric layer of receptor regulation.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, ERK phosphorylation assays, chimeric receptors, and TAT-TM2 disrupting peptide in HEK293T cells\",\n      \"pmids\": [\"37394637\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"interaction shown in overexpression system, not endogenous tissue\", \"physiological context where GPR143-ADRA1B coupling operates unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established ADRA1B as a pro-survival, anti-differentiation factor in MYCN-amplified neuroblastoma and a tractable combination target with retinoids.\",\n      \"evidence\": \"Genetic ADRA1B knockout, doxazosin antagonism, viability and differentiation assays, and xenograft model with 13-cis retinoic acid\",\n      \"pmids\": [\"37289021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"downstream survival signaling opposing retinoid differentiation not defined\", \"endogenous ligand driving ADRA1B in the tumor not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified ADRA1B as the dominant sympathetic receptor in dental pulp stem cells that suppresses proliferation and migration via metabolic reprogramming.\",\n      \"evidence\": \"RNA-seq, Seahorse and ATP/lactate metabolic assays, migration and cell cycle assays with ADRA1B manipulation in hDPSCs\",\n      \"pmids\": [\"37769871\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"link between Gq signaling and the glycolytic shift mechanistically incomplete\", \"in vivo validation provided only by later study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a sex-specific hepatic role for ADRA1B in glucose and energy homeostasis through tissue-specific genetics.\",\n      \"evidence\": \"CRISPR-Cas9 hepatocyte-specific Adra1b knockout in female and male mice with glucose/insulin tolerance tests and metabolic phenotyping\",\n      \"pmids\": [\"39259165\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"molecular basis of sex dimorphism not resolved\", \"direct hepatocyte signaling driving gluconeogenic capacity not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended hepatic ADRA1B function to show it restrains inflammation and fibrosis in MASLD independent of steatosis or systemic metabolism.\",\n      \"evidence\": \"Hepatocyte-specific Adra1b knockout on MASLD diet with histology, qPCR, and cytokine protein quantification\",\n      \"pmids\": [\"41087030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"intracellular pathway by which ADRA1B suppresses cytokine production unresolved\", \"whether the effect is cell-autonomous to hepatocytes or via stellate-cell crosstalk not dissected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Confirmed in vivo that ADRA1B suppresses odontoblast differentiation by inhibiting PGC-1alpha-dependent mitochondrial metabolism, linking sympathetic tone to dentine formation.\",\n      \"evidence\": \"Gain/loss-of-function in hDPSCs with OCR and differentiation assays, rat sympathectomy pulp-capping model, and Adra1bflox/flox;Prx1-cre conditional knockout mice\",\n      \"pmids\": [\"40660609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mechanism coupling ADRA1B Gq signaling to PGC-1alpha repression not defined\", \"clinical relevance to human dentine regeneration untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single Gq-coupled receptor produces divergent, tissue-specific outcomes—protective in heart and liver, pro-pathologic in airway, neuroblastoma, and dental pulp—remains unresolved at the level of distinct downstream effector wiring.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"no unified map linking ADRA1B to specific second-messenger and kinase outputs per cell type\", \"endogenous ligands and receptor partners in each context incompletely defined\", \"structural basis of the GPR143 TM2 interaction not solved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [11, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GPR143\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}