{"gene":"TRPC3","run_date":"2026-04-28T21:43:00","timeline":{"discoveries":[{"year":1999,"finding":"TRPC3 is a non-selective cation channel directly activated by diacylglycerol (DAG) in a membrane-delimited, protein kinase C-independent manner, establishing it as a second-messenger-operated cation channel downstream of phospholipase C.","method":"Electrophysiology (patch clamp), DAG application, PKC inhibitor controls in HEK293 cells expressing hTRPC3","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — in vitro channel reconstitution with pharmacological dissection, foundational paper with >1000 citations, replicated by multiple subsequent studies","pmids":["9930701"],"is_preprint":false},{"year":2003,"finding":"Receptor-mediated activation of TRPC3 in intact cells occurs via DAG production from phospholipase C, independently of G proteins, protein kinase C, or inositol 1,4,5-trisphosphate; DAG metabolism controls the duration of TRPC3 activation.","method":"Fluorescence Ca2+ imaging, pharmacological inhibitors, agonist dose-response, DAG metabolism inhibition in HEK293 cells stably expressing TRPC3","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal pharmacological approaches in intact cells, consistent with foundational DAG-activation paper","pmids":["12606542"],"is_preprint":false},{"year":1999,"finding":"TRPC3 is highly enriched in CNS neurons, co-localizes with TrkB, and is required for BDNF/TrkB-induced PLC-dependent non-selective cation conductance in pontine neurons, establishing TRPC3 as a neurotrophin-activated channel in vivo.","method":"Immunohistochemistry, electrophysiology in pontine neurons, dominant-negative and overexpression strategies","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — combined in vivo localization and functional electrophysiology with loss/gain of function","pmids":["10677043"],"is_preprint":false},{"year":2004,"finding":"Src kinase plays an obligatory role in receptor- and DAG-dependent activation of TRPC3; pharmacological inhibition of Src, dominant-negative Src, or Src-deficient cell lines abolish TRPC3 activation, which is restored by wild-type Src.","method":"Pharmacological Src inhibitors, dominant-negative Src expression, Src-deficient cell line complementation, Ca2+ entry assays in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genetic and pharmacological approaches converging on the same conclusion","pmids":["15271991"],"is_preprint":false},{"year":2004,"finding":"Protein kinase C phosphorylates TRPC3 at Ser712, providing negative feedback regulation; mutation of Ser712 to alanine abolishes PKC-mediated inhibition and enhances agonist-stimulated Ca2+ entry.","method":"Site-directed mutagenesis (S712A), PMA treatment, in vivo phosphorylation assay, Ca2+ imaging in HEK293 cells","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 — site-directed mutagenesis identifying specific phosphorylation site with functional validation","pmids":["15533987"],"is_preprint":false},{"year":2003,"finding":"The calmodulin/IP3 receptor-binding (CIRB) region in the C terminus of TRPC3 is required for plasma membrane targeting; internal deletion of this 20-amino acid region mislocalizes TRPC3 to intracellular compartments and abolishes channel activity, but the mechanism is independent of actual IP3 receptor or calmodulin binding.","method":"Confocal microscopy of fluorescent protein-tagged TRPC3 mutants, Ca2+ entry assays, expression in IP3 receptor-null DT40 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — deletion mutagenesis combined with localization imaging and functional Ca2+ assays, confirmed in IP3R-null cells","pmids":["12730194"],"is_preprint":false},{"year":2003,"finding":"N-linked glycosylation at a single extracellular loop (e1) site in TRPC3 confers considerable constitutive activity; engineering an additional glycosylation site (as in TRPC6) markedly reduces TRPC3 basal activity, identifying glycosylation pattern as a molecular determinant of constitutive vs. regulated channel behavior.","method":"In vitro mutagenesis of NXT motifs, immunoblotting, electrophysiology, and fluorescence imaging in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with multiple functional readouts, reciprocal glycosylation engineering between TRPC3 and TRPC6","pmids":["12970363"],"is_preprint":false},{"year":2005,"finding":"PLCγ1 binds to TRPC3 via an intermolecular PH domain interaction: a partial PH domain in PLCγ1 interacts with a complementary PH-like domain in TRPC3, controlling cell-surface expression of the channel.","method":"Co-immunoprecipitation, gestalt PH-domain algorithm, lipid binding assays, surface expression measurements","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding experiments with functional consequence (surface expression), published in Nature","pmids":["15744307"],"is_preprint":false},{"year":2005,"finding":"Endogenous TRPC1, TRPC3, and TRPC7 assemble into a heteromeric complex that mediates a major component of store-operated Ca2+ entry in HEK-293 cells; co-immunoprecipitation confirmed the TRPC1-TRPC3-TRPC7 complex.","method":"siRNA knockdown, Ba2+ entry assay, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP combined with siRNA functional rescue, multiple combinations tested","pmids":["15972814"],"is_preprint":false},{"year":2006,"finding":"TRPC3 physically and functionally couples with the Na+/Ca2+ exchanger NCX1 in cardiac myocytes; PLC stimulation triggers NCX-mediated Ca2+ entry dependent on TRPC3-mediated Na+ loading, and PLC activation promotes co-recruitment of TRPC3-NCX1 complex to the plasma membrane.","method":"Reciprocal co-immunoprecipitation, GST pull-down, surface biotinylation, dominant-negative TRPC3 expression, Ca2+ fluorimetry in rat cardiomyocytes","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP and pull-down in native cardiac tissue with functional dominant-negative validation","pmids":["17129578"],"is_preprint":false},{"year":2006,"finding":"TRPC3 co-localizes with NCX1 and Na+/K+-ATPase in the axial transverse-axial tubular system of rat ventricular myocytes; reciprocal immunoprecipitation from native ventricle confirms TRPC3–NCX1 association (direct) but not TRPC3–NKA (indirect via NCX1).","method":"Western blot, immunofluorescence, reciprocal co-immunoprecipitation from rat/canine ventricle and Sf9 cells expressing defined protein combinations","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 — native tissue co-IP replicated with defined combinations in insect cell reconstitution","pmids":["17012351"],"is_preprint":false},{"year":2008,"finding":"IP3 receptors on the sarcoplasmic reticulum activate sarcolemmal TRPC3 channels in cerebral artery myocytes, generating Na+ influx, membrane depolarization, voltage-dependent Ca2+ channel opening, and vasoconstriction independently of SR Ca2+ release.","method":"SR Ca2+ depletion (FRET-based D1ER indicator), shRNA knockdown of TRPC3, patch clamp, intravital Ca2+ imaging, pharmacological blockers in isolated cerebral arteries","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — TRPC3 shRNA knockdown with electrophysiology and Ca2+ imaging in native tissue, multiple orthogonal methods","pmids":["18388325"],"is_preprint":false},{"year":2008,"finding":"TRPC3 interacts with RACK1 via N-terminal residues Glu-232, Asp-233, Glu-240, and Glu-244; this interaction controls plasma membrane localization of TRPC3 and is required for agonist-induced recruitment of a TRPC3–RACK1–IP3R ternary complex, increased TRPC3 surface expression, and IP3-dependent Ca2+ release.","method":"Site-directed mutagenesis of RACK1-binding residues, co-immunoprecipitation, surface biotinylation, Ca2+ imaging in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis of specific binding residues with multiple functional readouts","pmids":["18755685"],"is_preprint":false},{"year":2006,"finding":"TRPC3 functionally couples with RyR1 in skeletal muscle; TRPC3 knockdown reduces excitation-contraction coupling gain and RyR1 Ca2+ release channel activity without altering SR Ca2+ load, and alters expression of key triadic proteins (triadin, junctophilin-1, calsequestrin, TRPC1).","method":"Retroviral shRNA knockdown, Mn2+ influx, Fluo-4 Ca2+ imaging, caffeine-induced Ca2+ release, immunoblotting in mouse primary myotubes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KD with multiple functional readouts and biochemical analysis in primary cells","pmids":["16484216"],"is_preprint":false},{"year":2007,"finding":"PIP2 directly activates TRPC3 channels in excised membrane patches; TRPC3 channels in the TRPC3/6/7 subfamily exhibit complex regulation by both DAG and PIP2, with PIP2 required for DAG-dependent activation.","method":"Excised inside-out patch clamp, PIP2 application, ATP application, cell-attached patch with DAG analog in TRPC3/6/7-expressing cells","journal":"Cell calcium","confidence":"High","confidence_rationale":"Tier 1 — direct excised-patch electrophysiology demonstrating PIP2 gating","pmids":["17942152"],"is_preprint":false},{"year":2009,"finding":"Pyrazole compound Pyr3 selectively and directly inhibits TRPC3 channels; photoaffinity labeling demonstrates direct binding to the TRPC3 protein; structure-function studies identify the trichloroacrylic amide group as essential for TRPC3 selectivity.","method":"Electrophysiology, photoaffinity labeling, structure-activity relationship studies, Ca2+ imaging in DT40 B lymphocytes and cardiomyocytes","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — direct photoaffinity labeling proving physical binding combined with electrophysiology and structure-function analysis","pmids":["19289841"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structure of human TRPC3 at 4.4 Å resolution reveals a two-layer architecture with a bell-shaped cytosolic layer (N-terminal ankyrin repeats and C-terminal coiled-coil) supporting the transmembrane layer; extensive inter-subunit interactions of cytosolic domains mediate tetramer assembly; a high-affinity inhibitor (BTDM) wedges between the S5-S6 pore domain and voltage sensor-like domain to block channel opening.","method":"Single-particle cryo-EM at 4.4 Å resolution, structural comparison with TRPC6 inhibitor complex","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with inhibitor-bound mechanistic interpretation","pmids":["29700422"],"is_preprint":false},{"year":2004,"finding":"TRPC3 mediates UTP/pyrimidine receptor-induced depolarization and constriction of cerebral artery smooth muscle cells; antisense knockdown of TRPC3 abolishes UTP-evoked whole-cell cationic currents and vasoconstriction without affecting myogenic (pressure-induced) responses, whereas TRPC6 antisense had no effect on UTP responses.","method":"Antisense oligodeoxynucleotides, patch clamp, arterial diameter measurements in intact cerebral arteries","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 — antisense KD with electrophysiology and functional vascular readout in native tissue","pmids":["15604128"],"is_preprint":false},{"year":2006,"finding":"Cellular cholesterol loading activates TRPC3-dependent non-selective cation conductance and promotes surface expression of TRPC3; cholesterol and PLC stimulation each increase TRPC3 plasma membrane presentation, with cholesterol-induced expression being sustained versus transient PLC-mediated trafficking.","method":"Electrophysiology, dominant-negative TRPC3 with extracellular HA tag conferring antibody sensitivity, cholesterol loading in HEK293 cells","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — novel dominant-negative approach with pharmacological confirmation, single lab","pmids":["16448384"],"is_preprint":false},{"year":2008,"finding":"TRPM4b physically interacts with TRPC3 (identified by yeast two-hybrid and confirmed by co-immunoprecipitation), co-localizes at the plasma membrane, and overexpression of TRPM4b suppresses TRPC3-mediated whole-cell currents by >90% and abolishes store-operated Ca2+ entry.","method":"Yeast two-hybrid, co-immunoprecipitation, confocal microscopy, whole-cell patch clamp in HEK293T cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — yeast two-hybrid confirmed by co-IP and functional electrophysiology, single lab","pmids":["18262493"],"is_preprint":false},{"year":2009,"finding":"TRPC3 mediates the scaffolding interaction between Orai1 and the type I IP3 receptor; TRPC3 silencing prevents Orai1–type I IP3R association, attenuates RACK1–type I IP3R interaction, and reduces agonist-stimulated Ca2+ release and entry, placing TRPC3 as a central organizer of the Orai1–STIM1–TRPC3–RACK1–type I IP3R signaling complex.","method":"siRNA knockdown of TRPC3, co-immunoprecipitation, Ca2+ imaging in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — co-IP with siRNA confirmation, single lab, multiple interactors assessed","pmids":["20022948"],"is_preprint":false},{"year":2017,"finding":"β-arrestin-1-biased AT1R agonist (TRV120027) promotes recruitment of TRPC3 and PLCγ into the AT1R–β-arrestin-1 signaling complex at the plasma membrane; blocking the β-arrestin-1/PLCγ interaction with a TAT-P1 peptide abolishes TRV120027-induced TRPC3 activation and catecholamine secretion.","method":"Co-immunoprecipitation, TAT peptide blockade, Ca2+ influx measurements, catecholamine secretion assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with specific peptide blockade providing mechanistic dissection, single lab","pmids":["28181498"],"is_preprint":false},{"year":2011,"finding":"TRPC3 is a major Ca2+ influx channel in pancreatic acini and salivary gland cells; genetic deletion or pharmacological inhibition of TRPC3 with Pyr3 protects these secretory epithelia from Ca2+-dependent cytotoxicity in acute pancreatitis and Sjögren syndrome models.","method":"Trpc3-/- mice, Pyr3 pharmacological inhibition, acute pancreatitis model (cerulein injection), Ca2+ signaling analysis","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO combined with selective pharmacological inhibition in vivo and in vitro","pmids":["21354153"],"is_preprint":false},{"year":2011,"finding":"WNK4 kinase restricts TRPC3-mediated Ca2+ influx in vascular smooth muscle cells; WNK4 depletion augments TRPC3-dependent Ca2+ entry and induces hypertrophic growth and vasoconstriction; PHAII-causing WNK4 mutations and kinase-dead mutants fail to inhibit TRPC3.","method":"siRNA knockdown of WNK4, WNK4 mutant expression, Ca2+ influx assays, myography in mesenteric arteries","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — kinase-dead and disease mutant analysis combined with functional vascular assays","pmids":["21670282"],"is_preprint":false},{"year":2012,"finding":"TRPC3 and TRPC6 double knockout mice show deficits in rapidly-adapting mechanosensitive currents in sensory neurons and hearing loss; loss of TRPC3 alone shifts RA currents to intermediate-adapting; TRPC3 and TRPC6 co-expression in sensory neuron cell lines reconstitutes FM1-43-sensitive mechanically gated currents.","method":"Single/double KO mice, patch clamp of DRG neurons, auditory brainstem responses, outer hair cell mechanotransduction recording, FM1-43 uptake, heterologous reconstitution","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with electrophysiology and reconstitution in heterologous system","pmids":["22724068"],"is_preprint":false},{"year":2015,"finding":"TRPC3 forms a stable protein complex with NADPH oxidase 2 (Nox2) in cardiomyocytes, stabilizing Nox2 and amplifying mechanical stress-induced ROS signaling, leading to cardiac fibrosis; this channel activity-independent scaffolding function of TRPC3 is distinct from its ion-conducting role.","method":"Co-immunoprecipitation, ROS measurements, cardiac fibrosis assays in TRPC3-overexpressing and KO mice, pressure overload model","journal":"Scientific reports (inferred from Frontiers review citing primary data)","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with functional consequence in vivo; primary data described in review (PMID:28936433) with reference to original publications","pmids":["28936433","28790356"],"is_preprint":false},{"year":2015,"finding":"TRPC3 promotes cardiac arrhythmogenesis through spatial coupling with NCX1: TRPC3 activation increases NCX current and elevates local Ca2+ near NCX1; excessive TRPC3 activation causes transient spatial uncoupling of TRPC3 and NCX1, leading to Ca2+ overload and arrhythmias.","method":"TRPC3-overexpressing mouse model, novel TRPC3 agonist GSK1702934A, patch clamp, Langendorff heart preparation, immunocytochemistry colocalization","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — transgenic model with pharmacological activation, electrophysiology, and colocalization imaging","pmids":["25631581"],"is_preprint":false},{"year":2009,"finding":"TRPC3 mediates T-cell receptor-dependent Ca2+ entry in human T-lymphocytes; TRPC3 gene mutations in T-cell mutants defective in Ca2+ influx are accompanied by loss of TRPC3 expression, and reintroduction of TRPC3 cDNA rescues both Ca2+ currents and TCR-dependent signals.","method":"Genetic complementation of T-cell mutants with TRPC3 cDNA, electrophysiology, Ca2+ imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic rescue experiment directly linking TRPC3 to TCR-dependent Ca2+ entry","pmids":["12736256"],"is_preprint":false},{"year":2022,"finding":"TRPC3 acts as a negative regulator of IP3 receptor-mediated Ca2+ release; downregulation of TRPC3 in senescence promotes cytosolic/mitochondrial Ca2+ oscillations and elevates mitochondrial OXPHOS; re-expression of TRPC3 in senescent cells reduces mitochondrial Ca2+ load.","method":"TRPC3 re-expression in senescent fibroblasts, mitochondrial Ca2+ measurements, OXPHOS measurements, xenograft tumor model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function rescue in senescent cells with multiple orthogonal readouts including in vivo","pmids":["35177596"],"is_preprint":false},{"year":2022,"finding":"DAG interacts with two lipid-binding sites (L1 and L2) in TRPC3; MD simulations show rapid DAG accumulation at both sites; L2-site mutations (e.g., G652A) promote a sensitized channel state with faster activation kinetics upon repetitive DAG exposure, defining a lipid-dependent sensitization mechanism.","method":"Structure-guided mutagenesis, electrophysiology with photoswitchable DAG probe, molecular dynamics simulations","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 — structure-guided mutagenesis combined with MD simulations and optical pharmacology","pmids":["35604352"],"is_preprint":false},{"year":2019,"finding":"A photoswitchable DAG analog (OptoBI-1) enables light-controlled, lipid-metabolism-independent activation of TRPC3 channels; this tool demonstrated TRPC3-linked control of neuronal firing and endothelial Ca2+ transients in native cells.","method":"Azobenzene-based photoswitch chemistry, electrophysiology, Ca2+ imaging in endothelial cells and neurons","journal":"Chemical science","confidence":"Medium","confidence_rationale":"Tier 2 — novel pharmacological tool with functional validation in native cell types, single lab","pmids":["30997005"],"is_preprint":false},{"year":2014,"finding":"TRPC3 gain-of-function Moonwalker mutation (T635A in the S4-S5 linker) causes constitutive channel overactivation, Purkinje cell and unipolar brush cell degeneration, and cerebellar ataxia, linking channel gating to cerebellar development.","method":"Genetic mouse model characterization, electrophysiology, histology of Purkinje cells","journal":"Cerebellum","confidence":"High","confidence_rationale":"Tier 2 — well-characterized gain-of-function mouse model with electrophysiology and histological phenotype","pmids":["24797279"],"is_preprint":false},{"year":2015,"finding":"The Moonwalker TRPC3 gain-of-function mutation alters Ca2+ signaling in Purkinje cells and is coupled to disrupted lipid homeostasis (ceramide pathway); treatment with ceramide improves dendritic outgrowth of mutant Purkinje cells, revealing a TRPC3-calcium-lipid metabolism axis in cerebellar development.","method":"Laser-capture microdissection transcriptomics, lipidomics, organotypic cerebellar slice treatment with ceramide, dendritic morphology analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic and lipidomic discovery with pharmacological rescue, single lab","pmids":["25908616"],"is_preprint":false},{"year":2016,"finding":"TRPC3 channels in mediobasal hypothalamus neurons are required for glucose-excited neuron responses to glucose; TRPC3 loss-of-function (constitutive and conditional KO) blunts hypothalamic glucose detection, food intake regulation, and glucose-stimulated insulin secretion.","method":"Constitutive and conditional TRPC3 KO mice, in vitro Ca2+ imaging of MBH neurons, intracerebroventricular glucose injection, intracarotid glucose injection, food intake measurement","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with both in vivo and in vitro functional phenotypes","pmids":["27899482"],"is_preprint":false},{"year":2009,"finding":"NO inhibits TRPC3 (in complex with TRPC1) via a PKG-dependent mechanism in vascular smooth muscle cells; NO/cGMP/PKG inhibition of TRPC1/TRPC3 channels contributes to vasorelaxation.","method":"Whole-cell patch clamp in freshly isolated SMC, intracellular antibody blockade, co-immunoprecipitation of TRPC1 with TRPC3, PKG inhibitor (KT5823), vessel myograph","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 — patch clamp with intracellular antibody blockade and co-IP of native complex, confirmed in intact vessel","pmids":["19502552"],"is_preprint":false},{"year":2012,"finding":"TRPC3 mediates IgG immune complex-induced non-selective cation current in rat DRG neurons through the Syk-PLC-IP3 signaling pathway downstream of Fcγ receptor I; selective TRPC3 siRNA knockdown attenuates the IgG-IC-induced Ca2+ response.","method":"Whole-cell patch clamp, siRNA knockdown of TRPC3, Syk inhibitor, PLC inhibitor, IP3R antagonists, single-cell RT-PCR","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — electrophysiology combined with targeted siRNA and pharmacological pathway dissection in primary neurons","pmids":["22787041"],"is_preprint":false},{"year":2021,"finding":"METTL3 stabilizes TRPC3 mRNA via m6A modification; PLAA inhibits METTL3 expression through ubiquitin-mediated degradation, reducing TRPC3-mediated Ca2+ influx and suppressing ovarian cancer metastasis.","method":"Ubiquitination assay, m6A methylation analysis, TRPC3 mRNA stability assay, Ca2+ influx measurements, orthotopic xenograft model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — post-transcriptional regulatory mechanism with functional validation in vitro and in vivo, single lab","pmids":["35869392"],"is_preprint":false},{"year":2021,"finding":"Progesterone receptor isoform B (PGR-B) suppresses uterine contractility by reducing Trpc3 and Oxtr expression and increasing Plcl2, compromising oxytocin-TRPC3 signaling; PGR-B overexpression in smooth muscle prolongs gestational length in mice.","method":"Transgenic mouse models overexpressing PGR-A or PGR-B in smooth muscle, RNA-seq, CRISPRa functional assay, contractility measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic and transgenic mouse data with functional contractility readout, positions TRPC3 in the PGR-B pathway","pmids":["33707208"],"is_preprint":false},{"year":2018,"finding":"TRPC3 and TRPC7 form heteromeric channels activated by P2Y2 receptor stimulation with ATP/UTP via G protein and PLCβ in ventricular cardiomyocytes; anti-TRPC3 intracellular antibody inhibits the current and TRPC3/TRPC7 co-immunoprecipitate from native cardiac tissue.","method":"Whole-cell patch clamp with intracellular anti-TRPC3 antibody, co-immunoprecipitation from rat ventricular myocytes, Mn2+ quench, Ba2+ influx","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 — native tissue co-IP with intracellular antibody blockade in patch clamp","pmids":["18502908"],"is_preprint":false},{"year":2017,"finding":"TRPC3 mediates Na+ influx downstream of DAG/PLCγ activation by VEGF, which drives reverse-mode NCX operation, ERK1/2 activation, and endothelial tubular differentiation (angiogenesis); TRPC3 and NCX are functionally coupled in this pathway.","method":"TRPC3 siRNA, TRPC3 inhibitors, reverse-mode NCX inhibitors, Na+ influx assay, ERK1/2 phosphorylation, tubulogenesis assay in human endothelial cells","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — multiple inhibitor and siRNA approaches with mechanistic pathway dissection, single lab","pmids":["28535874"],"is_preprint":false},{"year":2017,"finding":"TRPC3 and TRPC6 contribute to the physiological stretch-induced slow force response (SFR) in cardiomyocytes by mediating stretch-induced intracellular Ca2+ increases that activate calcineurin/NFAT; under pathological chronic stress, TRPC3/TRPC6 mediate hypertrophic signaling.","method":"Mechanical stretch protocols in cardiomyocytes, TRPC3/6 inhibitors, Ca2+ imaging (review citing original experimental data)","journal":"Progress in biophysics and molecular biology","confidence":"Medium","confidence_rationale":"Tier 3 — review synthesizing experimental data from multiple studies; mechanistic evidence from cited primary work","pmids":["28645743"],"is_preprint":false},{"year":2015,"finding":"Combined genetic deletion of TRPC3 and TRPC6 protects mice from pressure overload-induced cardiac hypertrophy and dysfunction, whereas single deletion of either channel alone is insufficient, demonstrating functional redundancy and the need for dual inhibition.","method":"Single and double TRPC3/TRPC6 KO mice, transverse aortic constriction, echocardiography, histology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — double KO epistasis experiment in vivo demonstrating genetic redundancy","pmids":["24453217"],"is_preprint":false},{"year":2010,"finding":"TRPC3 constitutive function in human coronary artery endothelial cells is required for proper NF-κB activation and VCAM-1 expression; TRPC3 knockdown reduces TNFα-induced IκBα phosphorylation/degradation and VCAM-1 expression; the mechanism requires calmodulin-dependent signaling downstream of constitutive TRPC3-mediated Ca2+ influx.","method":"TRPC3 siRNA, TRPC3 overexpression in HEK293 and HCAEC, NF-κB pathway analysis, calmodulin inhibition, monocyte adhesion assay","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA KD and OE with signaling pathway dissection, single lab","pmids":["20360250"],"is_preprint":false},{"year":2012,"finding":"TRPC3 interacts with TRPC1 in cortical astrocytes to form heteromeric channels where TRPC1 reduces TRPC3 activity; TRPC3 is required for astrocyte Ca2+ entry, proliferation, and migration in vitro and for astrogliosis following brain injury in vivo.","method":"Co-immunoprecipitation of TRPC1/TRPC3 in HEK-293, TRPC3 KO and TRPC1 KO mice, stab wound injury model, astrocyte Ca2+ imaging, migration and proliferation assays","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — co-IP with genetic KO models and in vivo injury model","pmids":["28636132"],"is_preprint":false},{"year":2012,"finding":"STIM1L (splice variant of STIM1) binds more abundantly to TRPC3 than canonical STIM1, and tends to suppress TRPC3/TRPC6-mediated receptor-operated Ca2+ entry more strongly; co-immunoprecipitation confirms differential STIM1/STIM1L binding to TRPC3.","method":"Co-immunoprecipitation, Ca2+ influx measurements in HEK293 cells stably expressing ETA receptor","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP with functional Ca2+ assays, single lab","pmids":["23068106"],"is_preprint":false},{"year":2009,"finding":"A pathogenic C-terminal truncated polycystin-2 (TRPP2) mutant (697fsX) physically associates with TRPC3 at the plasma membrane, altering ion-permeating pore properties and enhancing receptor-activated Ca2+ influx; wild-type TRPP2 is ER-localized and does not associate with TRPC3.","method":"Co-immunoprecipitation, pull-down assay, cross-linking, single-channel recording, confocal microscopy in HEK293 and LLC-PK1 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple protein interaction methods with electrophysiological functional validation","pmids":["19812035"],"is_preprint":false}],"current_model":"TRPC3 is a plasma membrane non-selective cation channel that is directly gated by diacylglycerol (produced by PLC downstream of receptor activation) in a PKC-independent, membrane-delimited manner; channel activity is negatively regulated by PKC phosphorylation at Ser712 and by N-linked glycosylation, positively regulated by Src kinase, PIP2, and membrane cholesterol, and controlled at the surface-expression level by a CIRB-domain-dependent targeting mechanism and by PLCγ1 via intermolecular PH-domain interaction; TRPC3 assembles into homo- or heterotetramers with TRPC1, TRPC6, TRPC7, and TRPM4b, forms signaling complexes with NCX1, RyR1, IP3 receptors, RACK1, Nox2, and Orai1, and mediates Ca2+/Na+ influx that regulates diverse processes including cardiac contractility and arrhythmia, cerebrovascular tone, hypothalamic glucose sensing, neurotrophin (BDNF/TrkB) signaling, T-cell activation, cerebellar Purkinje cell integrity, and mechanosensation in sensory neurons and cochlear hair cells."},"narrative":{"teleology":[{"year":1999,"claim":"The fundamental gating mechanism of TRPC3 was established: DAG directly activates the channel in a membrane-delimited manner independent of PKC, resolving the long-standing question of how PLC-coupled receptors open TRP channels without store depletion.","evidence":"Patch-clamp electrophysiology with DAG application and PKC inhibitor controls in HEK293 cells expressing hTRPC3","pmids":["9930701"],"confidence":"High","gaps":["Structural basis of DAG binding site unknown at this time","Whether PIP₂ is required for DAG-dependent gating not yet addressed"]},{"year":1999,"claim":"TRPC3 was identified as the channel mediating BDNF/TrkB neurotrophin signaling in CNS neurons, establishing its first native physiological role beyond heterologous expression systems.","evidence":"Immunohistochemistry, electrophysiology with dominant-negative and overexpression strategies in pontine neurons","pmids":["10677043"],"confidence":"High","gaps":["Identity of the endogenous TRPC3 complex in neurons unknown","Whether TRPC3 acts alone or in heteromeric assemblies in this context"]},{"year":2003,"claim":"Multiple regulatory determinants of TRPC3 were mapped: DAG metabolism controls activation duration, the C-terminal CIRB region is required for plasma membrane targeting (independent of actual IP₃R/CaM binding), and the single N-glycosylation site on extracellular loop e1 accounts for TRPC3's high constitutive activity relative to TRPC6.","evidence":"Pharmacological DAG metabolism inhibition, deletion mutagenesis with confocal imaging in IP₃R-null DT40 cells, reciprocal glycosylation site engineering between TRPC3 and TRPC6 with electrophysiology","pmids":["12606542","12730194","12970363"],"confidence":"High","gaps":["Molecular identity of CIRB-dependent trafficking machinery unknown","Whether glycosylation differences explain tissue-specific constitutive activity not tested"]},{"year":2004,"claim":"Two key regulatory phosphorylation mechanisms were defined: Src kinase is obligatory for receptor/DAG-coupled activation, and PKC phosphorylation at Ser712 provides negative feedback, answering how kinase signaling tunes TRPC3 channel activity.","evidence":"Src inhibitors, dominant-negative Src, Src-deficient cell complementation; S712A mutagenesis with phosphorylation and Ca²⁺ assays in HEK293 cells","pmids":["15271991","15533987"],"confidence":"High","gaps":["Direct Src phosphorylation site on TRPC3 not mapped","Whether Src and PKC regulation are interdependent not resolved"]},{"year":2004,"claim":"TRPC3 was shown to mediate receptor-induced vasoconstriction in native cerebral arteries, establishing it as a physiological regulator of vascular tone distinct from TRPC6.","evidence":"Antisense knockdown of TRPC3 with patch clamp and arterial diameter measurements in intact cerebral arteries","pmids":["15604128"],"confidence":"High","gaps":["Whether TRPC3 mediates myogenic tone (as opposed to receptor-operated tone) unclear","Heteromeric channel composition in native smooth muscle unknown"]},{"year":2005,"claim":"Two surface-expression control mechanisms were discovered: PLCγ1 binds TRPC3 via a split (gestalt) PH-domain interaction controlling surface delivery, and TRPC1/TRPC3/TRPC7 form a native heteromeric complex mediating store-operated Ca²⁺ entry, revealing that TRPC3 function depends on both trafficking and subunit composition.","evidence":"Co-immunoprecipitation and lipid-binding assays for PLCγ1–TRPC3 PH domain; siRNA knockdown with co-IP for heteromeric complex in HEK293 cells","pmids":["15744307","15972814"],"confidence":"High","gaps":["Whether the PLCγ1–TRPC3 PH interaction is regulated by lipids in vivo not determined","Stoichiometry of heteromeric assemblies undefined"]},{"year":2006,"claim":"TRPC3 was established as a cardiac signaling hub: it physically couples with NCX1 in cardiomyocytes to drive PLC-dependent Ca²⁺ entry via Na⁺ loading, and separately couples with RyR1 in skeletal muscle to modulate excitation-contraction coupling gain.","evidence":"Reciprocal co-IP and GST pull-down in cardiac tissue with dominant-negative TRPC3; shRNA knockdown with Ca²⁺ release and E-C coupling assays in primary myotubes","pmids":["17129578","17012351","16484216"],"confidence":"High","gaps":["Direct binding interface between TRPC3 and NCX1 not structurally defined","Whether TRPC3–RyR1 coupling is direct or scaffold-mediated unknown"]},{"year":2007,"claim":"PIP₂ was shown to directly gate TRPC3 in excised patches and to be required for DAG-dependent activation, resolving how lipid environment controls channel open probability.","evidence":"Excised inside-out patch-clamp with direct PIP₂ and DAG analog application","pmids":["17942152"],"confidence":"High","gaps":["PIP₂ binding site on TRPC3 not identified","Interplay between PIP₂ depletion by PLC and PIP₂ requirement for gating not fully modeled"]},{"year":2008,"claim":"The TRPC3–RACK1–IP₃R ternary complex was mapped to specific N-terminal residues (E232, D233, E240, E244), and IP₃ receptors on the SR were shown to activate sarcolemmal TRPC3 independently of Ca²⁺ release, establishing a junctional signaling mechanism in cerebral artery myocytes.","evidence":"Site-directed mutagenesis of RACK1-binding residues with surface biotinylation; shRNA knockdown of TRPC3 with FRET-based SR Ca²⁺ and patch clamp in cerebral arteries","pmids":["18755685","18388325"],"confidence":"High","gaps":["Whether IP₃R conformational coupling to TRPC3 involves direct contact or an intermediate scaffold","Structural basis of RACK1–TRPC3 interface at atomic level unknown"]},{"year":2009,"claim":"TRPC3 was identified as essential for T-cell receptor-dependent Ca²⁺ entry (by genetic complementation of T-cell mutants), shown to organize a macromolecular Orai1–STIM1–RACK1–IP₃R complex, and found to be inhibited by NO/cGMP/PKG signaling in vascular smooth muscle, broadening its roles to immune activation and vasorelaxation.","evidence":"Genetic rescue of Ca²⁺-deficient T-cell mutants with TRPC3 cDNA; siRNA with co-IP in HEK293; patch clamp with intracellular antibody blockade and co-IP of native TRPC1/TRPC3 complex in smooth muscle","pmids":["12736256","20022948","19502552"],"confidence":"High","gaps":["Whether TRPC3 scaffolding of Orai1–IP₃R is independent of its ion conductance not fully dissected","PKG phosphorylation site(s) on TRPC3 not identified"]},{"year":2009,"claim":"Pyr3 was identified as the first selective TRPC3 inhibitor through photoaffinity labeling proving direct binding, providing a pharmacological tool that enabled subsequent in vivo studies.","evidence":"Photoaffinity labeling, structure-activity relationship, electrophysiology in DT40 B cells and cardiomyocytes","pmids":["19289841"],"confidence":"High","gaps":["Pyr3 binding site on TRPC3 not structurally resolved","Selectivity over all TRP family members not comprehensively profiled"]},{"year":2011,"claim":"Genetic and pharmacological evidence demonstrated TRPC3 as the major Ca²⁺ influx channel in exocrine secretory cells, with Trpc3⁻/⁻ mice and Pyr3 protecting against pancreatitis, and WNK4 kinase was identified as a negative regulator of TRPC3 in vascular smooth muscle linking to hypertension genetics.","evidence":"Trpc3⁻/⁻ mice with cerulein pancreatitis model and Pyr3; WNK4 siRNA and PHAII mutant expression with myography in mesenteric arteries","pmids":["21354153","21670282"],"confidence":"High","gaps":["Whether WNK4 directly phosphorylates TRPC3 or acts indirectly not determined","Therapeutic window for Pyr3 in pancreatitis not established"]},{"year":2012,"claim":"TRPC3/TRPC6 double knockout revealed their joint requirement for rapidly-adapting mechanotransduction in DRG sensory neurons and cochlear hair cells, establishing TRPC3 as a mechanosensory channel component.","evidence":"Single and double KO mice with DRG patch clamp, auditory brainstem responses, outer hair cell recording, and heterologous reconstitution","pmids":["22724068"],"confidence":"High","gaps":["Whether TRPC3/TRPC6 are the pore-forming subunits of the mechanotransduction complex or accessory subunits","Force-transmission mechanism to the channel unknown"]},{"year":2014,"claim":"The Moonwalker gain-of-function mutation (T635A in S4–S5 linker) linked constitutive TRPC3 overactivation to Purkinje cell degeneration and cerebellar ataxia, identifying this channel as essential for cerebellar neuron survival and connecting gating to disease.","evidence":"Moonwalker mouse model with electrophysiology and Purkinje cell histology; subsequent lipidomics showing disrupted ceramide metabolism partially rescued by ceramide treatment","pmids":["24797279","25908616"],"confidence":"High","gaps":["Whether human TRPC3 gain-of-function mutations cause ataxia not established","How constitutive Ca²⁺ influx disrupts ceramide homeostasis mechanistically"]},{"year":2015,"claim":"TRPC3 was shown to have a channel-activity-independent scaffolding function: it stabilizes Nox2 in cardiomyocytes to amplify mechanical stress-induced ROS and fibrosis, and combined TRPC3/TRPC6 deletion (but not single deletion) protects against pressure-overload cardiac hypertrophy, demonstrating functional redundancy.","evidence":"Co-IP of TRPC3–Nox2, ROS measurements, pressure-overload in TRPC3-overexpressing and KO mice; double TRPC3/TRPC6 KO with TAC and echocardiography","pmids":["28936433","24453217","25631581"],"confidence":"High","gaps":["Nox2 binding domain on TRPC3 not mapped","Whether scaffolding versus ion-conducting functions can be pharmacologically separated"]},{"year":2016,"claim":"Conditional TRPC3 knockout in the hypothalamus demonstrated its requirement for glucose-excited neuron responses and systemic glucose homeostasis, expanding TRPC3's physiological roles to central metabolic sensing.","evidence":"Constitutive and conditional TRPC3 KO mice with MBH neuron Ca²⁺ imaging, intracerebroventricular glucose, food intake, and insulin secretion measurements","pmids":["27899482"],"confidence":"High","gaps":["Upstream signal linking glucose metabolism to TRPC3 gating in MBH neurons not identified","Whether DAG/PLC pathway mediates glucose detection through TRPC3 in this context"]},{"year":2018,"claim":"The cryo-EM structure of TRPC3 at 4.4 Å revealed a tetrameric two-layer architecture with ankyrin repeat and coiled-coil domains forming the cytosolic bell, and identified the BTDM inhibitor-binding pocket between S5–S6 and the voltage-sensor-like domain, providing the first structural framework for channel gating and drug design.","evidence":"Single-particle cryo-EM of human TRPC3 with bound BTDM inhibitor","pmids":["29700422"],"confidence":"High","gaps":["DAG-bound or PIP₂-bound open-state structure not yet solved","Structural basis of Src or PKC regulation not visualized"]},{"year":2022,"claim":"Two DAG-binding sites (L1 and L2) were functionally mapped using structure-guided mutagenesis and MD simulations; L2-site mutations promote a sensitized channel state, revealing a lipid-dependent molecular memory mechanism for repetitive DAG exposure.","evidence":"Structure-guided mutagenesis with photoswitchable DAG (OptoBI-1) electrophysiology and MD simulations","pmids":["35604352"],"confidence":"High","gaps":["High-resolution cryo-EM with DAG bound at L1 and L2 not yet available","Physiological relevance of L2-dependent sensitization in native cells not demonstrated"]},{"year":2022,"claim":"TRPC3 was identified as a negative regulator of IP₃R-mediated Ca²⁺ release; its downregulation in senescence promotes mitochondrial Ca²⁺ oscillations and enhanced OXPHOS, revealing a non-canonical role in controlling intracellular Ca²⁺ store dynamics.","evidence":"TRPC3 re-expression in senescent fibroblasts with mitochondrial Ca²⁺ and OXPHOS measurements, xenograft model","pmids":["35177596"],"confidence":"High","gaps":["Mechanism by which TRPC3 suppresses IP₃R-mediated release (scaffolding vs. ion flux) not resolved","Whether this applies across cell types beyond fibroblasts"]},{"year":null,"claim":"Major open questions remain: the high-resolution structure of TRPC3 in DAG/PIP₂-bound open states, the direct Src phosphorylation site, the structural interface for Nox2 scaffolding, whether channel-independent functions can be pharmacologically dissected from ion conduction, and whether human TRPC3 gain-of-function mutations cause cerebellar ataxia.","evidence":"","pmids":[],"confidence":"High","gaps":["Open-state structure with bound DAG/PIP₂ not solved","Src phosphorylation site on TRPC3 not identified","Human genetic disease causality for TRPC3 not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,14,24]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,14,29]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[20,25]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,5,7,9,10,16,18]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,3,4,21]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,14,22,27]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[13,40]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,31,33]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[27,35]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[22,25,41]}],"complexes":["TRPC1/TRPC3/TRPC7 heterotetramer","TRPC3-NCX1 signaling complex","TRPC3-RACK1-IP3R ternary complex","TRPC3-Nox2 complex"],"partners":["TRPC1","TRPC6","TRPC7","NCX1","RACK1","PLCG1","ORAI1","NOX2"],"other_free_text":[]},"mechanistic_narrative":"TRPC3 is a non-selective cation channel that functions as a central integrator of receptor-activated phospholipase C signaling, transducing diacylglycerol production into Ca²⁺ and Na⁺ influx across diverse cell types including neurons, cardiomyocytes, vascular smooth muscle, immune cells, and secretory epithelia. The channel is directly gated by DAG in a membrane-delimited, PKC-independent manner, with PIP₂ serving as a required co-activator and Src kinase playing an obligatory role in receptor-coupled activation [PMID:9930701, PMID:17942152, PMID:15271991]. TRPC3 assembles as a homotetramer or heterotetramer with TRPC1, TRPC6, or TRPC7 and forms macromolecular signaling complexes with NCX1, RACK1, IP₃ receptors, Nox2, and Orai1, coupling ion flux to downstream processes including cardiac excitation-contraction coupling, cerebrovascular tone regulation, hypothalamic glucose sensing, BDNF/TrkB neurotrophin signaling, T-cell activation, and mechanotransduction in sensory neurons and cochlear hair cells [PMID:17129578, PMID:18755685, PMID:10677043, PMID:22724068, PMID:27899482]. Channel activity is negatively regulated by PKC phosphorylation at Ser712 and by N-linked glycosylation pattern, while surface expression is controlled by a C-terminal CIRB domain, PLCγ1 via an intermolecular PH-domain interaction, and cholesterol loading; a gain-of-function T635A mutation in the S4–S5 linker (Moonwalker) causes constitutive overactivation and cerebellar Purkinje cell degeneration leading to ataxia [PMID:15533987, PMID:12970363, PMID:15744307, PMID:24797279]."},"prefetch_data":{"uniprot":{"accession":"Q13507","full_name":"Short transient receptor potential channel 3","aliases":["Transient receptor protein 3","TRP-3","hTrp-3","hTrp3"],"length_aa":921,"mass_kda":105.5,"function":"Forms a receptor-activated non-selective calcium permeant cation channel (PubMed:29726814, PubMed:30139744, PubMed:35051376, PubMed:9417057, PubMed:9930701, PubMed:10611319) Forms a receptor-activated non-selective calcium permeant cation channel. May be operated by a phosphatidylinositol second messenger system activated by receptor tyrosine kinases or G-protein coupled receptors","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q13507/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRPC3","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRPC3","total_profiled":1310},"omim":[{"mim_id":"616410","title":"SPINOCEREBELLAR ATAXIA 41; SCA41","url":"https://www.omim.org/entry/616410"},{"mim_id":"612489","title":"RING FINGER PROTEIN 24; RNF24","url":"https://www.omim.org/entry/612489"},{"mim_id":"610277","title":"ORAI CALCIUM RELEASE-ACTIVATED CALCIUM MODULATOR 1; ORAI1","url":"https://www.omim.org/entry/610277"},{"mim_id":"606665","title":"OPSIN 4; OPN4","url":"https://www.omim.org/entry/606665"},{"mim_id":"605921","title":"STROMAL INTERACTION MOLECULE 1; STIM1","url":"https://www.omim.org/entry/605921"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":4.7},{"tissue":"pituitary gland","ntpm":7.0},{"tissue":"retina","ntpm":3.6}],"url":"https://www.proteinatlas.org/search/TRPC3"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q13507","domains":[{"cath_id":"1.25.40.20","chopping":"27-204","consensus_level":"medium","plddt":84.3217,"start":27,"end":204},{"cath_id":"-","chopping":"220-282_291-304","consensus_level":"medium","plddt":87.656,"start":220,"end":304},{"cath_id":"-","chopping":"335-548","consensus_level":"medium","plddt":84.8838,"start":335,"end":548},{"cath_id":"-","chopping":"556-684","consensus_level":"high","plddt":90.8498,"start":556,"end":684}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13507","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13507-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13507-F1-predicted_aligned_error_v6.png","plddt_mean":78.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRPC3","jax_strain_url":"https://www.jax.org/strain/search?query=TRPC3"},"sequence":{"accession":"Q13507","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13507.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13507/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13507"}},"corpus_meta":[{"pmid":"9930701","id":"PMC_9930701","title":"Direct activation of human TRPC6 and TRPC3 channels by diacylglycerol.","date":"1999","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/9930701","citation_count":1273,"is_preprint":false},{"pmid":"19289841","id":"PMC_19289841","title":"Selective and direct inhibition of TRPC3 channels underlies biological activities of a pyrazole compound.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19289841","citation_count":313,"is_preprint":false},{"pmid":"10677043","id":"PMC_10677043","title":"Activation of a TRPC3-dependent cation current through the neurotrophin BDNF.","date":"1999","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/10677043","citation_count":287,"is_preprint":false},{"pmid":"11943785","id":"PMC_11943785","title":"Comparison of human TRPC3 channels in receptor-activated and store-operated modes. Differential sensitivity to channel blockers suggests fundamental differences in channel composition.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11943785","citation_count":212,"is_preprint":false},{"pmid":"15972814","id":"PMC_15972814","title":"Endogenous TRPC1, TRPC3, and TRPC7 proteins combine to form native store-operated channels in HEK-293 cells.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15972814","citation_count":172,"is_preprint":false},{"pmid":"12970363","id":"PMC_12970363","title":"N-linked protein glycosylation is a major determinant for basal TRPC3 and TRPC6 channel activity.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12970363","citation_count":166,"is_preprint":false},{"pmid":"24453217","id":"PMC_24453217","title":"Combined TRPC3 and TRPC6 blockade by selective small-molecule or genetic deletion inhibits pathological cardiac hypertrophy.","date":"2014","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24453217","citation_count":165,"is_preprint":false},{"pmid":"15744307","id":"PMC_15744307","title":"Phospholipase Cgamma1 controls surface expression of TRPC3 through an intermolecular PH domain.","date":"2005","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/15744307","citation_count":156,"is_preprint":false},{"pmid":"29700422","id":"PMC_29700422","title":"Structure of the receptor-activated human TRPC6 and TRPC3 ion channels.","date":"2018","source":"Cell research","url":"https://pubmed.ncbi.nlm.nih.gov/29700422","citation_count":152,"is_preprint":false},{"pmid":"12606542","id":"PMC_12606542","title":"Signaling mechanism for receptor-activated canonical transient receptor potential 3 (TRPC3) channels.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12606542","citation_count":139,"is_preprint":false},{"pmid":"22724068","id":"PMC_22724068","title":"TRPC3 and TRPC6 are essential for normal mechanotransduction in subsets of sensory neurons and cochlear hair cells.","date":"2012","source":"Open biology","url":"https://pubmed.ncbi.nlm.nih.gov/22724068","citation_count":134,"is_preprint":false},{"pmid":"15604128","id":"PMC_15604128","title":"TRPC3 mediates pyrimidine receptor-induced depolarization of cerebral arteries.","date":"2004","source":"American journal of physiology. Heart and circulatory physiology","url":"https://pubmed.ncbi.nlm.nih.gov/15604128","citation_count":129,"is_preprint":false},{"pmid":"15971081","id":"PMC_15971081","title":"The diacylgylcerol-sensitive TRPC3/6/7 subfamily of cation channels: functional characterization and physiological relevance.","date":"2005","source":"Pflugers Archiv : European journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/15971081","citation_count":126,"is_preprint":false},{"pmid":"15271991","id":"PMC_15271991","title":"Obligatory role of Src kinase in the signaling mechanism for TRPC3 cation channels.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15271991","citation_count":123,"is_preprint":false},{"pmid":"12736256","id":"PMC_12736256","title":"TRPC3 mediates T-cell receptor-dependent calcium entry in human T-lymphocytes.","date":"2003","source":"The Journal of biological 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DAG metabolism controls the duration of TRPC3 activation.\",\n      \"method\": \"Fluorescence Ca2+ imaging, pharmacological inhibitors, agonist dose-response, DAG metabolism inhibition in HEK293 cells stably expressing TRPC3\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal pharmacological approaches in intact cells, consistent with foundational DAG-activation paper\",\n      \"pmids\": [\"12606542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TRPC3 is highly enriched in CNS neurons, co-localizes with TrkB, and is required for BDNF/TrkB-induced PLC-dependent non-selective cation conductance in pontine neurons, establishing TRPC3 as a neurotrophin-activated channel in vivo.\",\n      \"method\": \"Immunohistochemistry, electrophysiology in pontine neurons, dominant-negative and overexpression strategies\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — combined in vivo localization and functional electrophysiology with loss/gain of function\",\n      \"pmids\": [\"10677043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Src kinase plays an obligatory role in receptor- and DAG-dependent activation of TRPC3; pharmacological inhibition of Src, dominant-negative Src, or Src-deficient cell lines abolish TRPC3 activation, which is restored by wild-type Src.\",\n      \"method\": \"Pharmacological Src inhibitors, dominant-negative Src expression, Src-deficient cell line complementation, Ca2+ entry assays in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic and pharmacological approaches converging on the same conclusion\",\n      \"pmids\": [\"15271991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Protein kinase C phosphorylates TRPC3 at Ser712, providing negative feedback regulation; mutation of Ser712 to alanine abolishes PKC-mediated inhibition and enhances agonist-stimulated Ca2+ entry.\",\n      \"method\": \"Site-directed mutagenesis (S712A), PMA treatment, in vivo phosphorylation assay, Ca2+ imaging in HEK293 cells\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site-directed mutagenesis identifying specific phosphorylation site with functional validation\",\n      \"pmids\": [\"15533987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The calmodulin/IP3 receptor-binding (CIRB) region in the C terminus of TRPC3 is required for plasma membrane targeting; internal deletion of this 20-amino acid region mislocalizes TRPC3 to intracellular compartments and abolishes channel activity, but the mechanism is independent of actual IP3 receptor or calmodulin binding.\",\n      \"method\": \"Confocal microscopy of fluorescent protein-tagged TRPC3 mutants, Ca2+ entry assays, expression in IP3 receptor-null DT40 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — deletion mutagenesis combined with localization imaging and functional Ca2+ assays, confirmed in IP3R-null cells\",\n      \"pmids\": [\"12730194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"N-linked glycosylation at a single extracellular loop (e1) site in TRPC3 confers considerable constitutive activity; engineering an additional glycosylation site (as in TRPC6) markedly reduces TRPC3 basal activity, identifying glycosylation pattern as a molecular determinant of constitutive vs. regulated channel behavior.\",\n      \"method\": \"In vitro mutagenesis of NXT motifs, immunoblotting, electrophysiology, and fluorescence imaging in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with multiple functional readouts, reciprocal glycosylation engineering between TRPC3 and TRPC6\",\n      \"pmids\": [\"12970363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PLCγ1 binds to TRPC3 via an intermolecular PH domain interaction: a partial PH domain in PLCγ1 interacts with a complementary PH-like domain in TRPC3, controlling cell-surface expression of the channel.\",\n      \"method\": \"Co-immunoprecipitation, gestalt PH-domain algorithm, lipid binding assays, surface expression measurements\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding experiments with functional consequence (surface expression), published in Nature\",\n      \"pmids\": [\"15744307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Endogenous TRPC1, TRPC3, and TRPC7 assemble into a heteromeric complex that mediates a major component of store-operated Ca2+ entry in HEK-293 cells; co-immunoprecipitation confirmed the TRPC1-TRPC3-TRPC7 complex.\",\n      \"method\": \"siRNA knockdown, Ba2+ entry assay, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP combined with siRNA functional rescue, multiple combinations tested\",\n      \"pmids\": [\"15972814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TRPC3 physically and functionally couples with the Na+/Ca2+ exchanger NCX1 in cardiac myocytes; PLC stimulation triggers NCX-mediated Ca2+ entry dependent on TRPC3-mediated Na+ loading, and PLC activation promotes co-recruitment of TRPC3-NCX1 complex to the plasma membrane.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, GST pull-down, surface biotinylation, dominant-negative TRPC3 expression, Ca2+ fluorimetry in rat cardiomyocytes\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and pull-down in native cardiac tissue with functional dominant-negative validation\",\n      \"pmids\": [\"17129578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TRPC3 co-localizes with NCX1 and Na+/K+-ATPase in the axial transverse-axial tubular system of rat ventricular myocytes; reciprocal immunoprecipitation from native ventricle confirms TRPC3–NCX1 association (direct) but not TRPC3–NKA (indirect via NCX1).\",\n      \"method\": \"Western blot, immunofluorescence, reciprocal co-immunoprecipitation from rat/canine ventricle and Sf9 cells expressing defined protein combinations\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — native tissue co-IP replicated with defined combinations in insect cell reconstitution\",\n      \"pmids\": [\"17012351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"IP3 receptors on the sarcoplasmic reticulum activate sarcolemmal TRPC3 channels in cerebral artery myocytes, generating Na+ influx, membrane depolarization, voltage-dependent Ca2+ channel opening, and vasoconstriction independently of SR Ca2+ release.\",\n      \"method\": \"SR Ca2+ depletion (FRET-based D1ER indicator), shRNA knockdown of TRPC3, patch clamp, intravital Ca2+ imaging, pharmacological blockers in isolated cerebral arteries\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — TRPC3 shRNA knockdown with electrophysiology and Ca2+ imaging in native tissue, multiple orthogonal methods\",\n      \"pmids\": [\"18388325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRPC3 interacts with RACK1 via N-terminal residues Glu-232, Asp-233, Glu-240, and Glu-244; this interaction controls plasma membrane localization of TRPC3 and is required for agonist-induced recruitment of a TRPC3–RACK1–IP3R ternary complex, increased TRPC3 surface expression, and IP3-dependent Ca2+ release.\",\n      \"method\": \"Site-directed mutagenesis of RACK1-binding residues, co-immunoprecipitation, surface biotinylation, Ca2+ imaging in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis of specific binding residues with multiple functional readouts\",\n      \"pmids\": [\"18755685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TRPC3 functionally couples with RyR1 in skeletal muscle; TRPC3 knockdown reduces excitation-contraction coupling gain and RyR1 Ca2+ release channel activity without altering SR Ca2+ load, and alters expression of key triadic proteins (triadin, junctophilin-1, calsequestrin, TRPC1).\",\n      \"method\": \"Retroviral shRNA knockdown, Mn2+ influx, Fluo-4 Ca2+ imaging, caffeine-induced Ca2+ release, immunoblotting in mouse primary myotubes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with multiple functional readouts and biochemical analysis in primary cells\",\n      \"pmids\": [\"16484216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PIP2 directly activates TRPC3 channels in excised membrane patches; TRPC3 channels in the TRPC3/6/7 subfamily exhibit complex regulation by both DAG and PIP2, with PIP2 required for DAG-dependent activation.\",\n      \"method\": \"Excised inside-out patch clamp, PIP2 application, ATP application, cell-attached patch with DAG analog in TRPC3/6/7-expressing cells\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct excised-patch electrophysiology demonstrating PIP2 gating\",\n      \"pmids\": [\"17942152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pyrazole compound Pyr3 selectively and directly inhibits TRPC3 channels; photoaffinity labeling demonstrates direct binding to the TRPC3 protein; structure-function studies identify the trichloroacrylic amide group as essential for TRPC3 selectivity.\",\n      \"method\": \"Electrophysiology, photoaffinity labeling, structure-activity relationship studies, Ca2+ imaging in DT40 B lymphocytes and cardiomyocytes\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct photoaffinity labeling proving physical binding combined with electrophysiology and structure-function analysis\",\n      \"pmids\": [\"19289841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structure of human TRPC3 at 4.4 Å resolution reveals a two-layer architecture with a bell-shaped cytosolic layer (N-terminal ankyrin repeats and C-terminal coiled-coil) supporting the transmembrane layer; extensive inter-subunit interactions of cytosolic domains mediate tetramer assembly; a high-affinity inhibitor (BTDM) wedges between the S5-S6 pore domain and voltage sensor-like domain to block channel opening.\",\n      \"method\": \"Single-particle cryo-EM at 4.4 Å resolution, structural comparison with TRPC6 inhibitor complex\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with inhibitor-bound mechanistic interpretation\",\n      \"pmids\": [\"29700422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRPC3 mediates UTP/pyrimidine receptor-induced depolarization and constriction of cerebral artery smooth muscle cells; antisense knockdown of TRPC3 abolishes UTP-evoked whole-cell cationic currents and vasoconstriction without affecting myogenic (pressure-induced) responses, whereas TRPC6 antisense had no effect on UTP responses.\",\n      \"method\": \"Antisense oligodeoxynucleotides, patch clamp, arterial diameter measurements in intact cerebral arteries\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — antisense KD with electrophysiology and functional vascular readout in native tissue\",\n      \"pmids\": [\"15604128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cellular cholesterol loading activates TRPC3-dependent non-selective cation conductance and promotes surface expression of TRPC3; cholesterol and PLC stimulation each increase TRPC3 plasma membrane presentation, with cholesterol-induced expression being sustained versus transient PLC-mediated trafficking.\",\n      \"method\": \"Electrophysiology, dominant-negative TRPC3 with extracellular HA tag conferring antibody sensitivity, cholesterol loading in HEK293 cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — novel dominant-negative approach with pharmacological confirmation, single lab\",\n      \"pmids\": [\"16448384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRPM4b physically interacts with TRPC3 (identified by yeast two-hybrid and confirmed by co-immunoprecipitation), co-localizes at the plasma membrane, and overexpression of TRPM4b suppresses TRPC3-mediated whole-cell currents by >90% and abolishes store-operated Ca2+ entry.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, confocal microscopy, whole-cell patch clamp in HEK293T cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — yeast two-hybrid confirmed by co-IP and functional electrophysiology, single lab\",\n      \"pmids\": [\"18262493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRPC3 mediates the scaffolding interaction between Orai1 and the type I IP3 receptor; TRPC3 silencing prevents Orai1–type I IP3R association, attenuates RACK1–type I IP3R interaction, and reduces agonist-stimulated Ca2+ release and entry, placing TRPC3 as a central organizer of the Orai1–STIM1–TRPC3–RACK1–type I IP3R signaling complex.\",\n      \"method\": \"siRNA knockdown of TRPC3, co-immunoprecipitation, Ca2+ imaging in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP with siRNA confirmation, single lab, multiple interactors assessed\",\n      \"pmids\": [\"20022948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"β-arrestin-1-biased AT1R agonist (TRV120027) promotes recruitment of TRPC3 and PLCγ into the AT1R–β-arrestin-1 signaling complex at the plasma membrane; blocking the β-arrestin-1/PLCγ interaction with a TAT-P1 peptide abolishes TRV120027-induced TRPC3 activation and catecholamine secretion.\",\n      \"method\": \"Co-immunoprecipitation, TAT peptide blockade, Ca2+ influx measurements, catecholamine secretion assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with specific peptide blockade providing mechanistic dissection, single lab\",\n      \"pmids\": [\"28181498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRPC3 is a major Ca2+ influx channel in pancreatic acini and salivary gland cells; genetic deletion or pharmacological inhibition of TRPC3 with Pyr3 protects these secretory epithelia from Ca2+-dependent cytotoxicity in acute pancreatitis and Sjögren syndrome models.\",\n      \"method\": \"Trpc3-/- mice, Pyr3 pharmacological inhibition, acute pancreatitis model (cerulein injection), Ca2+ signaling analysis\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO combined with selective pharmacological inhibition in vivo and in vitro\",\n      \"pmids\": [\"21354153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"WNK4 kinase restricts TRPC3-mediated Ca2+ influx in vascular smooth muscle cells; WNK4 depletion augments TRPC3-dependent Ca2+ entry and induces hypertrophic growth and vasoconstriction; PHAII-causing WNK4 mutations and kinase-dead mutants fail to inhibit TRPC3.\",\n      \"method\": \"siRNA knockdown of WNK4, WNK4 mutant expression, Ca2+ influx assays, myography in mesenteric arteries\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — kinase-dead and disease mutant analysis combined with functional vascular assays\",\n      \"pmids\": [\"21670282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPC3 and TRPC6 double knockout mice show deficits in rapidly-adapting mechanosensitive currents in sensory neurons and hearing loss; loss of TRPC3 alone shifts RA currents to intermediate-adapting; TRPC3 and TRPC6 co-expression in sensory neuron cell lines reconstitutes FM1-43-sensitive mechanically gated currents.\",\n      \"method\": \"Single/double KO mice, patch clamp of DRG neurons, auditory brainstem responses, outer hair cell mechanotransduction recording, FM1-43 uptake, heterologous reconstitution\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with electrophysiology and reconstitution in heterologous system\",\n      \"pmids\": [\"22724068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRPC3 forms a stable protein complex with NADPH oxidase 2 (Nox2) in cardiomyocytes, stabilizing Nox2 and amplifying mechanical stress-induced ROS signaling, leading to cardiac fibrosis; this channel activity-independent scaffolding function of TRPC3 is distinct from its ion-conducting role.\",\n      \"method\": \"Co-immunoprecipitation, ROS measurements, cardiac fibrosis assays in TRPC3-overexpressing and KO mice, pressure overload model\",\n      \"journal\": \"Scientific reports (inferred from Frontiers review citing primary data)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional consequence in vivo; primary data described in review (PMID:28936433) with reference to original publications\",\n      \"pmids\": [\"28936433\", \"28790356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRPC3 promotes cardiac arrhythmogenesis through spatial coupling with NCX1: TRPC3 activation increases NCX current and elevates local Ca2+ near NCX1; excessive TRPC3 activation causes transient spatial uncoupling of TRPC3 and NCX1, leading to Ca2+ overload and arrhythmias.\",\n      \"method\": \"TRPC3-overexpressing mouse model, novel TRPC3 agonist GSK1702934A, patch clamp, Langendorff heart preparation, immunocytochemistry colocalization\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic model with pharmacological activation, electrophysiology, and colocalization imaging\",\n      \"pmids\": [\"25631581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRPC3 mediates T-cell receptor-dependent Ca2+ entry in human T-lymphocytes; TRPC3 gene mutations in T-cell mutants defective in Ca2+ influx are accompanied by loss of TRPC3 expression, and reintroduction of TRPC3 cDNA rescues both Ca2+ currents and TCR-dependent signals.\",\n      \"method\": \"Genetic complementation of T-cell mutants with TRPC3 cDNA, electrophysiology, Ca2+ imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue experiment directly linking TRPC3 to TCR-dependent Ca2+ entry\",\n      \"pmids\": [\"12736256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRPC3 acts as a negative regulator of IP3 receptor-mediated Ca2+ release; downregulation of TRPC3 in senescence promotes cytosolic/mitochondrial Ca2+ oscillations and elevates mitochondrial OXPHOS; re-expression of TRPC3 in senescent cells reduces mitochondrial Ca2+ load.\",\n      \"method\": \"TRPC3 re-expression in senescent fibroblasts, mitochondrial Ca2+ measurements, OXPHOS measurements, xenograft tumor model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function rescue in senescent cells with multiple orthogonal readouts including in vivo\",\n      \"pmids\": [\"35177596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DAG interacts with two lipid-binding sites (L1 and L2) in TRPC3; MD simulations show rapid DAG accumulation at both sites; L2-site mutations (e.g., G652A) promote a sensitized channel state with faster activation kinetics upon repetitive DAG exposure, defining a lipid-dependent sensitization mechanism.\",\n      \"method\": \"Structure-guided mutagenesis, electrophysiology with photoswitchable DAG probe, molecular dynamics simulations\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-guided mutagenesis combined with MD simulations and optical pharmacology\",\n      \"pmids\": [\"35604352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A photoswitchable DAG analog (OptoBI-1) enables light-controlled, lipid-metabolism-independent activation of TRPC3 channels; this tool demonstrated TRPC3-linked control of neuronal firing and endothelial Ca2+ transients in native cells.\",\n      \"method\": \"Azobenzene-based photoswitch chemistry, electrophysiology, Ca2+ imaging in endothelial cells and neurons\",\n      \"journal\": \"Chemical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — novel pharmacological tool with functional validation in native cell types, single lab\",\n      \"pmids\": [\"30997005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRPC3 gain-of-function Moonwalker mutation (T635A in the S4-S5 linker) causes constitutive channel overactivation, Purkinje cell and unipolar brush cell degeneration, and cerebellar ataxia, linking channel gating to cerebellar development.\",\n      \"method\": \"Genetic mouse model characterization, electrophysiology, histology of Purkinje cells\",\n      \"journal\": \"Cerebellum\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — well-characterized gain-of-function mouse model with electrophysiology and histological phenotype\",\n      \"pmids\": [\"24797279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The Moonwalker TRPC3 gain-of-function mutation alters Ca2+ signaling in Purkinje cells and is coupled to disrupted lipid homeostasis (ceramide pathway); treatment with ceramide improves dendritic outgrowth of mutant Purkinje cells, revealing a TRPC3-calcium-lipid metabolism axis in cerebellar development.\",\n      \"method\": \"Laser-capture microdissection transcriptomics, lipidomics, organotypic cerebellar slice treatment with ceramide, dendritic morphology analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic and lipidomic discovery with pharmacological rescue, single lab\",\n      \"pmids\": [\"25908616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPC3 channels in mediobasal hypothalamus neurons are required for glucose-excited neuron responses to glucose; TRPC3 loss-of-function (constitutive and conditional KO) blunts hypothalamic glucose detection, food intake regulation, and glucose-stimulated insulin secretion.\",\n      \"method\": \"Constitutive and conditional TRPC3 KO mice, in vitro Ca2+ imaging of MBH neurons, intracerebroventricular glucose injection, intracarotid glucose injection, food intake measurement\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with both in vivo and in vitro functional phenotypes\",\n      \"pmids\": [\"27899482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NO inhibits TRPC3 (in complex with TRPC1) via a PKG-dependent mechanism in vascular smooth muscle cells; NO/cGMP/PKG inhibition of TRPC1/TRPC3 channels contributes to vasorelaxation.\",\n      \"method\": \"Whole-cell patch clamp in freshly isolated SMC, intracellular antibody blockade, co-immunoprecipitation of TRPC1 with TRPC3, PKG inhibitor (KT5823), vessel myograph\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — patch clamp with intracellular antibody blockade and co-IP of native complex, confirmed in intact vessel\",\n      \"pmids\": [\"19502552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPC3 mediates IgG immune complex-induced non-selective cation current in rat DRG neurons through the Syk-PLC-IP3 signaling pathway downstream of Fcγ receptor I; selective TRPC3 siRNA knockdown attenuates the IgG-IC-induced Ca2+ response.\",\n      \"method\": \"Whole-cell patch clamp, siRNA knockdown of TRPC3, Syk inhibitor, PLC inhibitor, IP3R antagonists, single-cell RT-PCR\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology combined with targeted siRNA and pharmacological pathway dissection in primary neurons\",\n      \"pmids\": [\"22787041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3 stabilizes TRPC3 mRNA via m6A modification; PLAA inhibits METTL3 expression through ubiquitin-mediated degradation, reducing TRPC3-mediated Ca2+ influx and suppressing ovarian cancer metastasis.\",\n      \"method\": \"Ubiquitination assay, m6A methylation analysis, TRPC3 mRNA stability assay, Ca2+ influx measurements, orthotopic xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — post-transcriptional regulatory mechanism with functional validation in vitro and in vivo, single lab\",\n      \"pmids\": [\"35869392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Progesterone receptor isoform B (PGR-B) suppresses uterine contractility by reducing Trpc3 and Oxtr expression and increasing Plcl2, compromising oxytocin-TRPC3 signaling; PGR-B overexpression in smooth muscle prolongs gestational length in mice.\",\n      \"method\": \"Transgenic mouse models overexpressing PGR-A or PGR-B in smooth muscle, RNA-seq, CRISPRa functional assay, contractility measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic and transgenic mouse data with functional contractility readout, positions TRPC3 in the PGR-B pathway\",\n      \"pmids\": [\"33707208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPC3 and TRPC7 form heteromeric channels activated by P2Y2 receptor stimulation with ATP/UTP via G protein and PLCβ in ventricular cardiomyocytes; anti-TRPC3 intracellular antibody inhibits the current and TRPC3/TRPC7 co-immunoprecipitate from native cardiac tissue.\",\n      \"method\": \"Whole-cell patch clamp with intracellular anti-TRPC3 antibody, co-immunoprecipitation from rat ventricular myocytes, Mn2+ quench, Ba2+ influx\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — native tissue co-IP with intracellular antibody blockade in patch clamp\",\n      \"pmids\": [\"18502908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRPC3 mediates Na+ influx downstream of DAG/PLCγ activation by VEGF, which drives reverse-mode NCX operation, ERK1/2 activation, and endothelial tubular differentiation (angiogenesis); TRPC3 and NCX are functionally coupled in this pathway.\",\n      \"method\": \"TRPC3 siRNA, TRPC3 inhibitors, reverse-mode NCX inhibitors, Na+ influx assay, ERK1/2 phosphorylation, tubulogenesis assay in human endothelial cells\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple inhibitor and siRNA approaches with mechanistic pathway dissection, single lab\",\n      \"pmids\": [\"28535874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRPC3 and TRPC6 contribute to the physiological stretch-induced slow force response (SFR) in cardiomyocytes by mediating stretch-induced intracellular Ca2+ increases that activate calcineurin/NFAT; under pathological chronic stress, TRPC3/TRPC6 mediate hypertrophic signaling.\",\n      \"method\": \"Mechanical stretch protocols in cardiomyocytes, TRPC3/6 inhibitors, Ca2+ imaging (review citing original experimental data)\",\n      \"journal\": \"Progress in biophysics and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review synthesizing experimental data from multiple studies; mechanistic evidence from cited primary work\",\n      \"pmids\": [\"28645743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Combined genetic deletion of TRPC3 and TRPC6 protects mice from pressure overload-induced cardiac hypertrophy and dysfunction, whereas single deletion of either channel alone is insufficient, demonstrating functional redundancy and the need for dual inhibition.\",\n      \"method\": \"Single and double TRPC3/TRPC6 KO mice, transverse aortic constriction, echocardiography, histology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO epistasis experiment in vivo demonstrating genetic redundancy\",\n      \"pmids\": [\"24453217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRPC3 constitutive function in human coronary artery endothelial cells is required for proper NF-κB activation and VCAM-1 expression; TRPC3 knockdown reduces TNFα-induced IκBα phosphorylation/degradation and VCAM-1 expression; the mechanism requires calmodulin-dependent signaling downstream of constitutive TRPC3-mediated Ca2+ influx.\",\n      \"method\": \"TRPC3 siRNA, TRPC3 overexpression in HEK293 and HCAEC, NF-κB pathway analysis, calmodulin inhibition, monocyte adhesion assay\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA KD and OE with signaling pathway dissection, single lab\",\n      \"pmids\": [\"20360250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPC3 interacts with TRPC1 in cortical astrocytes to form heteromeric channels where TRPC1 reduces TRPC3 activity; TRPC3 is required for astrocyte Ca2+ entry, proliferation, and migration in vitro and for astrogliosis following brain injury in vivo.\",\n      \"method\": \"Co-immunoprecipitation of TRPC1/TRPC3 in HEK-293, TRPC3 KO and TRPC1 KO mice, stab wound injury model, astrocyte Ca2+ imaging, migration and proliferation assays\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with genetic KO models and in vivo injury model\",\n      \"pmids\": [\"28636132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"STIM1L (splice variant of STIM1) binds more abundantly to TRPC3 than canonical STIM1, and tends to suppress TRPC3/TRPC6-mediated receptor-operated Ca2+ entry more strongly; co-immunoprecipitation confirms differential STIM1/STIM1L binding to TRPC3.\",\n      \"method\": \"Co-immunoprecipitation, Ca2+ influx measurements in HEK293 cells stably expressing ETA receptor\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with functional Ca2+ assays, single lab\",\n      \"pmids\": [\"23068106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A pathogenic C-terminal truncated polycystin-2 (TRPP2) mutant (697fsX) physically associates with TRPC3 at the plasma membrane, altering ion-permeating pore properties and enhancing receptor-activated Ca2+ influx; wild-type TRPP2 is ER-localized and does not associate with TRPC3.\",\n      \"method\": \"Co-immunoprecipitation, pull-down assay, cross-linking, single-channel recording, confocal microscopy in HEK293 and LLC-PK1 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple protein interaction methods with electrophysiological functional validation\",\n      \"pmids\": [\"19812035\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRPC3 is a plasma membrane non-selective cation channel that is directly gated by diacylglycerol (produced by PLC downstream of receptor activation) in a PKC-independent, membrane-delimited manner; channel activity is negatively regulated by PKC phosphorylation at Ser712 and by N-linked glycosylation, positively regulated by Src kinase, PIP2, and membrane cholesterol, and controlled at the surface-expression level by a CIRB-domain-dependent targeting mechanism and by PLCγ1 via intermolecular PH-domain interaction; TRPC3 assembles into homo- or heterotetramers with TRPC1, TRPC6, TRPC7, and TRPM4b, forms signaling complexes with NCX1, RyR1, IP3 receptors, RACK1, Nox2, and Orai1, and mediates Ca2+/Na+ influx that regulates diverse processes including cardiac contractility and arrhythmia, cerebrovascular tone, hypothalamic glucose sensing, neurotrophin (BDNF/TrkB) signaling, T-cell activation, cerebellar Purkinje cell integrity, and mechanosensation in sensory neurons and cochlear hair cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRPC3 is a non-selective cation channel that functions as a central integrator of receptor-activated phospholipase C signaling, transducing diacylglycerol production into Ca²⁺ and Na⁺ influx across diverse cell types including neurons, cardiomyocytes, vascular smooth muscle, immune cells, and secretory epithelia. The channel is directly gated by DAG in a membrane-delimited, PKC-independent manner, with PIP₂ serving as a required co-activator and Src kinase playing an obligatory role in receptor-coupled activation [PMID:9930701, PMID:17942152, PMID:15271991]. TRPC3 assembles as a homotetramer or heterotetramer with TRPC1, TRPC6, or TRPC7 and forms macromolecular signaling complexes with NCX1, RACK1, IP₃ receptors, Nox2, and Orai1, coupling ion flux to downstream processes including cardiac excitation-contraction coupling, cerebrovascular tone regulation, hypothalamic glucose sensing, BDNF/TrkB neurotrophin signaling, T-cell activation, and mechanotransduction in sensory neurons and cochlear hair cells [PMID:17129578, PMID:18755685, PMID:10677043, PMID:22724068, PMID:27899482]. Channel activity is negatively regulated by PKC phosphorylation at Ser712 and by N-linked glycosylation pattern, while surface expression is controlled by a C-terminal CIRB domain, PLCγ1 via an intermolecular PH-domain interaction, and cholesterol loading; a gain-of-function T635A mutation in the S4–S5 linker (Moonwalker) causes constitutive overactivation and cerebellar Purkinje cell degeneration leading to ataxia [PMID:15533987, PMID:12970363, PMID:15744307, PMID:24797279].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"The fundamental gating mechanism of TRPC3 was established: DAG directly activates the channel in a membrane-delimited manner independent of PKC, resolving the long-standing question of how PLC-coupled receptors open TRP channels without store depletion.\",\n      \"evidence\": \"Patch-clamp electrophysiology with DAG application and PKC inhibitor controls in HEK293 cells expressing hTRPC3\",\n      \"pmids\": [\"9930701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DAG binding site unknown at this time\", \"Whether PIP₂ is required for DAG-dependent gating not yet addressed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"TRPC3 was identified as the channel mediating BDNF/TrkB neurotrophin signaling in CNS neurons, establishing its first native physiological role beyond heterologous expression systems.\",\n      \"evidence\": \"Immunohistochemistry, electrophysiology with dominant-negative and overexpression strategies in pontine neurons\",\n      \"pmids\": [\"10677043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the endogenous TRPC3 complex in neurons unknown\", \"Whether TRPC3 acts alone or in heteromeric assemblies in this context\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Multiple regulatory determinants of TRPC3 were mapped: DAG metabolism controls activation duration, the C-terminal CIRB region is required for plasma membrane targeting (independent of actual IP₃R/CaM binding), and the single N-glycosylation site on extracellular loop e1 accounts for TRPC3's high constitutive activity relative to TRPC6.\",\n      \"evidence\": \"Pharmacological DAG metabolism inhibition, deletion mutagenesis with confocal imaging in IP₃R-null DT40 cells, reciprocal glycosylation site engineering between TRPC3 and TRPC6 with electrophysiology\",\n      \"pmids\": [\"12606542\", \"12730194\", \"12970363\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of CIRB-dependent trafficking machinery unknown\", \"Whether glycosylation differences explain tissue-specific constitutive activity not tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Two key regulatory phosphorylation mechanisms were defined: Src kinase is obligatory for receptor/DAG-coupled activation, and PKC phosphorylation at Ser712 provides negative feedback, answering how kinase signaling tunes TRPC3 channel activity.\",\n      \"evidence\": \"Src inhibitors, dominant-negative Src, Src-deficient cell complementation; S712A mutagenesis with phosphorylation and Ca²⁺ assays in HEK293 cells\",\n      \"pmids\": [\"15271991\", \"15533987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Src phosphorylation site on TRPC3 not mapped\", \"Whether Src and PKC regulation are interdependent not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"TRPC3 was shown to mediate receptor-induced vasoconstriction in native cerebral arteries, establishing it as a physiological regulator of vascular tone distinct from TRPC6.\",\n      \"evidence\": \"Antisense knockdown of TRPC3 with patch clamp and arterial diameter measurements in intact cerebral arteries\",\n      \"pmids\": [\"15604128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPC3 mediates myogenic tone (as opposed to receptor-operated tone) unclear\", \"Heteromeric channel composition in native smooth muscle unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Two surface-expression control mechanisms were discovered: PLCγ1 binds TRPC3 via a split (gestalt) PH-domain interaction controlling surface delivery, and TRPC1/TRPC3/TRPC7 form a native heteromeric complex mediating store-operated Ca²⁺ entry, revealing that TRPC3 function depends on both trafficking and subunit composition.\",\n      \"evidence\": \"Co-immunoprecipitation and lipid-binding assays for PLCγ1–TRPC3 PH domain; siRNA knockdown with co-IP for heteromeric complex in HEK293 cells\",\n      \"pmids\": [\"15744307\", \"15972814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the PLCγ1–TRPC3 PH interaction is regulated by lipids in vivo not determined\", \"Stoichiometry of heteromeric assemblies undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"TRPC3 was established as a cardiac signaling hub: it physically couples with NCX1 in cardiomyocytes to drive PLC-dependent Ca²⁺ entry via Na⁺ loading, and separately couples with RyR1 in skeletal muscle to modulate excitation-contraction coupling gain.\",\n      \"evidence\": \"Reciprocal co-IP and GST pull-down in cardiac tissue with dominant-negative TRPC3; shRNA knockdown with Ca²⁺ release and E-C coupling assays in primary myotubes\",\n      \"pmids\": [\"17129578\", \"17012351\", \"16484216\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface between TRPC3 and NCX1 not structurally defined\", \"Whether TRPC3–RyR1 coupling is direct or scaffold-mediated unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"PIP₂ was shown to directly gate TRPC3 in excised patches and to be required for DAG-dependent activation, resolving how lipid environment controls channel open probability.\",\n      \"evidence\": \"Excised inside-out patch-clamp with direct PIP₂ and DAG analog application\",\n      \"pmids\": [\"17942152\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PIP₂ binding site on TRPC3 not identified\", \"Interplay between PIP₂ depletion by PLC and PIP₂ requirement for gating not fully modeled\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The TRPC3–RACK1–IP₃R ternary complex was mapped to specific N-terminal residues (E232, D233, E240, E244), and IP₃ receptors on the SR were shown to activate sarcolemmal TRPC3 independently of Ca²⁺ release, establishing a junctional signaling mechanism in cerebral artery myocytes.\",\n      \"evidence\": \"Site-directed mutagenesis of RACK1-binding residues with surface biotinylation; shRNA knockdown of TRPC3 with FRET-based SR Ca²⁺ and patch clamp in cerebral arteries\",\n      \"pmids\": [\"18755685\", \"18388325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IP₃R conformational coupling to TRPC3 involves direct contact or an intermediate scaffold\", \"Structural basis of RACK1–TRPC3 interface at atomic level unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"TRPC3 was identified as essential for T-cell receptor-dependent Ca²⁺ entry (by genetic complementation of T-cell mutants), shown to organize a macromolecular Orai1–STIM1–RACK1–IP₃R complex, and found to be inhibited by NO/cGMP/PKG signaling in vascular smooth muscle, broadening its roles to immune activation and vasorelaxation.\",\n      \"evidence\": \"Genetic rescue of Ca²⁺-deficient T-cell mutants with TRPC3 cDNA; siRNA with co-IP in HEK293; patch clamp with intracellular antibody blockade and co-IP of native TRPC1/TRPC3 complex in smooth muscle\",\n      \"pmids\": [\"12736256\", \"20022948\", \"19502552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPC3 scaffolding of Orai1–IP₃R is independent of its ion conductance not fully dissected\", \"PKG phosphorylation site(s) on TRPC3 not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Pyr3 was identified as the first selective TRPC3 inhibitor through photoaffinity labeling proving direct binding, providing a pharmacological tool that enabled subsequent in vivo studies.\",\n      \"evidence\": \"Photoaffinity labeling, structure-activity relationship, electrophysiology in DT40 B cells and cardiomyocytes\",\n      \"pmids\": [\"19289841\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pyr3 binding site on TRPC3 not structurally resolved\", \"Selectivity over all TRP family members not comprehensively profiled\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Genetic and pharmacological evidence demonstrated TRPC3 as the major Ca²⁺ influx channel in exocrine secretory cells, with Trpc3⁻/⁻ mice and Pyr3 protecting against pancreatitis, and WNK4 kinase was identified as a negative regulator of TRPC3 in vascular smooth muscle linking to hypertension genetics.\",\n      \"evidence\": \"Trpc3⁻/⁻ mice with cerulein pancreatitis model and Pyr3; WNK4 siRNA and PHAII mutant expression with myography in mesenteric arteries\",\n      \"pmids\": [\"21354153\", \"21670282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether WNK4 directly phosphorylates TRPC3 or acts indirectly not determined\", \"Therapeutic window for Pyr3 in pancreatitis not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"TRPC3/TRPC6 double knockout revealed their joint requirement for rapidly-adapting mechanotransduction in DRG sensory neurons and cochlear hair cells, establishing TRPC3 as a mechanosensory channel component.\",\n      \"evidence\": \"Single and double KO mice with DRG patch clamp, auditory brainstem responses, outer hair cell recording, and heterologous reconstitution\",\n      \"pmids\": [\"22724068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPC3/TRPC6 are the pore-forming subunits of the mechanotransduction complex or accessory subunits\", \"Force-transmission mechanism to the channel unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The Moonwalker gain-of-function mutation (T635A in S4–S5 linker) linked constitutive TRPC3 overactivation to Purkinje cell degeneration and cerebellar ataxia, identifying this channel as essential for cerebellar neuron survival and connecting gating to disease.\",\n      \"evidence\": \"Moonwalker mouse model with electrophysiology and Purkinje cell histology; subsequent lipidomics showing disrupted ceramide metabolism partially rescued by ceramide treatment\",\n      \"pmids\": [\"24797279\", \"25908616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether human TRPC3 gain-of-function mutations cause ataxia not established\", \"How constitutive Ca²⁺ influx disrupts ceramide homeostasis mechanistically\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"TRPC3 was shown to have a channel-activity-independent scaffolding function: it stabilizes Nox2 in cardiomyocytes to amplify mechanical stress-induced ROS and fibrosis, and combined TRPC3/TRPC6 deletion (but not single deletion) protects against pressure-overload cardiac hypertrophy, demonstrating functional redundancy.\",\n      \"evidence\": \"Co-IP of TRPC3–Nox2, ROS measurements, pressure-overload in TRPC3-overexpressing and KO mice; double TRPC3/TRPC6 KO with TAC and echocardiography\",\n      \"pmids\": [\"28936433\", \"24453217\", \"25631581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nox2 binding domain on TRPC3 not mapped\", \"Whether scaffolding versus ion-conducting functions can be pharmacologically separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Conditional TRPC3 knockout in the hypothalamus demonstrated its requirement for glucose-excited neuron responses and systemic glucose homeostasis, expanding TRPC3's physiological roles to central metabolic sensing.\",\n      \"evidence\": \"Constitutive and conditional TRPC3 KO mice with MBH neuron Ca²⁺ imaging, intracerebroventricular glucose, food intake, and insulin secretion measurements\",\n      \"pmids\": [\"27899482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signal linking glucose metabolism to TRPC3 gating in MBH neurons not identified\", \"Whether DAG/PLC pathway mediates glucose detection through TRPC3 in this context\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The cryo-EM structure of TRPC3 at 4.4 Å revealed a tetrameric two-layer architecture with ankyrin repeat and coiled-coil domains forming the cytosolic bell, and identified the BTDM inhibitor-binding pocket between S5–S6 and the voltage-sensor-like domain, providing the first structural framework for channel gating and drug design.\",\n      \"evidence\": \"Single-particle cryo-EM of human TRPC3 with bound BTDM inhibitor\",\n      \"pmids\": [\"29700422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DAG-bound or PIP₂-bound open-state structure not yet solved\", \"Structural basis of Src or PKC regulation not visualized\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two DAG-binding sites (L1 and L2) were functionally mapped using structure-guided mutagenesis and MD simulations; L2-site mutations promote a sensitized channel state, revealing a lipid-dependent molecular memory mechanism for repetitive DAG exposure.\",\n      \"evidence\": \"Structure-guided mutagenesis with photoswitchable DAG (OptoBI-1) electrophysiology and MD simulations\",\n      \"pmids\": [\"35604352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution cryo-EM with DAG bound at L1 and L2 not yet available\", \"Physiological relevance of L2-dependent sensitization in native cells not demonstrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"TRPC3 was identified as a negative regulator of IP₃R-mediated Ca²⁺ release; its downregulation in senescence promotes mitochondrial Ca²⁺ oscillations and enhanced OXPHOS, revealing a non-canonical role in controlling intracellular Ca²⁺ store dynamics.\",\n      \"evidence\": \"TRPC3 re-expression in senescent fibroblasts with mitochondrial Ca²⁺ and OXPHOS measurements, xenograft model\",\n      \"pmids\": [\"35177596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which TRPC3 suppresses IP₃R-mediated release (scaffolding vs. ion flux) not resolved\", \"Whether this applies across cell types beyond fibroblasts\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions remain: the high-resolution structure of TRPC3 in DAG/PIP₂-bound open states, the direct Src phosphorylation site, the structural interface for Nox2 scaffolding, whether channel-independent functions can be pharmacologically dissected from ion conduction, and whether human TRPC3 gain-of-function mutations cause cerebellar ataxia.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Open-state structure with bound DAG/PIP₂ not solved\", \"Src phosphorylation site on TRPC3 not identified\", \"Human genetic disease causality for TRPC3 not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 14, 24]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 14, 29]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [20, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 7, 9, 10, 16, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 1, 3, 4, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 3, 4, 21]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 14, 22, 27]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [13, 40]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 31, 33]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [27, 35]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [22, 25, 41]}\n    ],\n    \"complexes\": [\n      \"TRPC1/TRPC3/TRPC7 heterotetramer\",\n      \"TRPC3-NCX1 signaling complex\",\n      \"TRPC3-RACK1-IP3R ternary complex\",\n      \"TRPC3-Nox2 complex\"\n    ],\n    \"partners\": [\n      \"TRPC1\",\n      \"TRPC6\",\n      \"TRPC7\",\n      \"NCX1\",\n      \"RACK1\",\n      \"PLCG1\",\n      \"ORAI1\",\n      \"NOX2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}