{"gene":"TRPV2","run_date":"2026-04-28T21:43:00","timeline":{"discoveries":[{"year":1999,"finding":"TRPV2 (VRL-1) is a nonselective cation channel activated by noxious heat (>52°C), expressed in medium- to large-diameter primary sensory neurons, and distinct from TRPV1 in its thermal threshold and lack of capsaicin/proton sensitivity.","method":"Heterologous expression, electrophysiology (patch-clamp), in vitro heat stimulation assays","journal":"Nature (referenced in corpus via PMID:14622291 background)","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology with defined thermal activation threshold, widely replicated across corpus","pmids":["15665528","14622291"],"is_preprint":false},{"year":2004,"finding":"2-aminoethoxydiphenyl borate (2-APB) directly activates TRPV1, TRPV2, and TRPV3 but not TRPV4, TRPV5, or TRPV6 in HEK293 cells, and potentiates heat- and capsaicin-evoked responses, suggesting a common activation mechanism shared by TRPV1–3.","method":"Calcium imaging, electrophysiology in HEK293 cells and Xenopus oocytes, pharmacological characterization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple expression systems, replicated in subsequent studies (PMID:17217057, 35484159)","pmids":["15194687","17217057"],"is_preprint":false},{"year":2006,"finding":"PI3-kinase promotes TRPV2 channel activity independently of channel translocation to the plasma membrane, as demonstrated by cytotoxicity assays and direct cell-surface expression measurements in stably transfected cells.","method":"Cytotoxicity assays, surface expression measurement, PI3K inhibitor (LY294002), stable transfection in HEK cells","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in single study; dissociates activity from trafficking","pmids":["16533525"],"is_preprint":false},{"year":2007,"finding":"Chemotactic peptide fMLP induces translocation of TRPV2 from the endoplasmic reticulum to the plasma membrane in macrophages via a PI3-kinase/pertussis toxin-sensitive (Gi/o) pathway, and this translocation is required for fMLP-induced calcium entry and macrophage migration.","method":"GFP-TRPV2 live imaging, whole-cell patch-clamp, PI3K inhibitor (LY294002), pertussis toxin, siRNA knockdown, dominant-negative TRPV2","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (imaging, electrophysiology, siRNA, pharmacology) in single study","pmids":["17154364"],"is_preprint":false},{"year":2007,"finding":"Species-dependent differences exist in TRPV2 activation: mouse and rat TRPV2 are robustly activated by heat (>53°C) and 2-APB in HEK293 cells, whereas human TRPV2 is not detectably activated by either stimulus. Chimeric and deletion studies show both the N- and C-terminal cytoplasmic domains of rat TRPV2 are important for heat and 2-APB responses and can act in trans.","method":"Calcium imaging, electrophysiology, chimera/deletion mutagenesis in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro mutagenesis combined with electrophysiology and calcium assays","pmids":["17395593"],"is_preprint":false},{"year":2008,"finding":"Cannabidiol (CBD) activates TRPV2 (EC50 = 3.7 µM) and evokes CGRP release from dorsal root ganglion neurons in a TRPV1- and cannabinoid-receptor-independent, extracellular Ca2+-dependent manner, as confirmed by siRNA knockdown of TRPV2.","method":"Calcium mobilization assays, electrophysiology, siRNA knockdown, CGRP release assay, ruthenium red block","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods; siRNA confirms TRPV2 specificity","pmids":["18550765"],"is_preprint":false},{"year":2008,"finding":"Insulin induces translocation of TRPV2 from the cytoplasm/ER to the plasma membrane in pancreatic β-cells via the insulin receptor/PI3K pathway, increasing calcium entry and potentiating glucose-stimulated insulin secretion.","method":"GFP/c-Myc-tagged TRPV2 translocation imaging, Fura-2 calcium imaging, shRNA knockdown, insulin receptor knockout β-cells, tranilast pharmacology","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches including genetic KO and live imaging","pmids":["18984736"],"is_preprint":false},{"year":2009,"finding":"Lysophospholipids (lysophosphatidylcholine and lysophosphatidylinositol) activate TRPV2 via Gq/Go-protein and PI3,4-kinase signaling, causing TRPV2 translocation to the plasma membrane and stimulating prostate cancer cell migration.","method":"Calcium imaging, pharmacology (Gq/Go inhibitors, PI3K inhibitor), TRPV2 surface trafficking assay, migration assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple methods but partial mechanistic resolution of signaling cascade","pmids":["19321128"],"is_preprint":false},{"year":2010,"finding":"TRPV2 is required for macrophage particle binding and phagocytosis; it is recruited to the nascent phagosome, depolarizes the plasma membrane, and this depolarization increases PtdIns(4,5)P2 synthesis, triggering actin depolymerization necessary for phagocytic receptor clustering. TRPV2-deficient mice show accelerated mortality to Listeria monocytogenes.","method":"TRPV2 knockout macrophages, phagocytosis assays (zymosan, IgG, complement), live imaging, PtdIns(4,5)P2 measurement, in vivo infection model","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with mechanistic dissection (PIP2 measurement, receptor clustering), replicated with in vivo data","pmids":["20118928"],"is_preprint":false},{"year":2010,"finding":"Ca2+-dependent desensitization of TRPV2 is mediated by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) and is independent of calmodulin, as shown by simultaneous confocal imaging of a fluorescent PIP2-binding probe and electrophysiological recording.","method":"Whole-cell patch-clamp, confocal imaging of PIP2-binding probe, calmodulin inhibitors, mutant calmodulin coexpression","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 — simultaneous imaging and electrophysiology with multiple pharmacological controls in single study","pmids":["20926660"],"is_preprint":false},{"year":2010,"finding":"RANKL-induced TRPV2 expression in preosteoclasts drives Ca2+ oscillations and activates NFATc1, promoting osteoclastogenesis; TRPV2 silencing reduces Ca2+ oscillation frequency, NFATc1 nuclear translocation, and osteoclast differentiation.","method":"DNA microarray, siRNA knockdown, patch-clamp, Ca2+ imaging, NFATc1 nuclear translocation assay","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA plus electrophysiology and imaging in single study","pmids":["20980052"],"is_preprint":false},{"year":2010,"finding":"PI3K/Akt signaling promotes insulin-induced TRPV2 translocation to the plasma membrane in pancreatic β-cells, accelerating first-phase glucose-stimulated insulin secretion; this is blocked by PI3K inhibition, tranilast, or TRPV2 shRNA.","method":"Total internal reflection fluorescent microscopy, Ca2+ imaging, shRNA knockdown, PI3K inhibitor, tranilast","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1–2 — TIRF live imaging of translocation with genetic and pharmacological confirmation","pmids":["20854263"],"is_preprint":false},{"year":2012,"finding":"TRPV2 localizes to podosomes in macrophages and increases submembrane Ca2+ concentration ([Ca2+]pm) at these sites; elevated [Ca2+]pm activates Pyk2 phosphorylation and negatively regulates podosome assembly; fMLP increases TRPV2 at the podosome.","method":"TIRFM imaging, c-Myc tagged TRPV2 surface expression, ruthenium red pharmacology, dominant-negative Pyk2, siRNA knockdown","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2–3 — live imaging with functional readouts in single study","pmids":["22226146"],"is_preprint":false},{"year":2013,"finding":"TRPV2 sarcolemmal accumulation in dilated cardiomyopathy (DCM) drives pathological Ca2+ entry and activates CaMKII and ROS production; blocking sarcolemmal TRPV2 accumulation (via N-terminal domain overexpression or tranilast) reduces ventricular dilation, fibrosis, and improves survival in DCM animal models.","method":"Immunological and cell physiological analyses, Western blot, transgenic/adenoviral overexpression of TRPV2 N-terminal domain, CaMKII phosphorylation assay, ROS measurement, in vivo DCM models","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — multiple animal models with mechanistic endpoint assays (CaMKII, ROS, cardiac function)","pmids":["23786999"],"is_preprint":false},{"year":2014,"finding":"TRPV2 is critical for cardiac structure and function: conditional TRPV2 knockout in adult mouse hearts causes rapid intercalated disc disorganization, conduction defects, impaired Ca2+ handling, and reduced IGF-1/PI3K/Akt signaling; IGF-1 administration partially rescues these defects.","method":"Cardiac-specific inducible TRPV2 knockout mice, echocardiography, Ca2+ imaging of single myocytes, intercalated disc morphology, IGF-1 rescue experiment, stretch-induced Ca2+ and IGF-1 secretion assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with multiple mechanistic readouts and in vivo rescue","pmids":["24874017"],"is_preprint":false},{"year":2015,"finding":"TRPV2 is translocated to the sarcolemma and T-tubules in dystrophic mdx cardiomyocytes (overexpressed ~2-fold), mediating abnormal stretch-activated Ca2+ influx in Duchenne muscular dystrophy; pore-blocking antibodies and siRNA ablation of TRPV2 protect cells from stress-induced Ca2+ signals.","method":"Western blot, immunocytochemistry, biotinylation assay, pharmacological modulators, pore-blocking antibodies, siRNA, confocal Ca2+ imaging","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal tools (antibody block, siRNA, imaging) in mdx model","pmids":["25616416"],"is_preprint":false},{"year":2015,"finding":"Focal mechanical stress induces TRPV2 translocation to the stressed membrane site via a PI3K/Rac-dependent mechanism, increasing local submembrane Ca2+ concentration; this is blocked by gadolinium and LY294002.","method":"GFP-TRPV2 live imaging, RFP-Akt co-imaging, ruthenium red pharmacology, PI3K inhibitor, dominant-negative Rac, siRNA knockdown","journal":"Physiological reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — live imaging with pharmacological and genetic dissection in single study","pmids":["25677550"],"is_preprint":false},{"year":2016,"finding":"Cryo-EM structure of rabbit TRPV2 at ~4 Å reveals that S6 (gate-forming helix) adopts a different conformation than TRPV1, and structural comparisons suggest that rotation of the ankyrin-repeat domain couples to pore opening via the TRP domain, which can be modulated by S6 secondary structure rearrangements.","method":"Cryo-electron microscopy (~4 Å resolution), structural comparison with TRPV1","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — near-atomic resolution cryo-EM structure with functional interpretation","pmids":["26779611"],"is_preprint":false},{"year":2016,"finding":"Full-length TRPV2 cryo-EM structure (~5 Å) reveals two constrictions (upper and lower gates) similar to TRPV1, but with wider upper and lower gates in the agonist-free state compared to closed and agonist-activated TRPV1, providing structural basis for TRPV channel diversity.","method":"Cryo-electron microscopy (~5 Å resolution), structural comparison with TRPV1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — near-atomic resolution cryo-EM of full-length channel","pmids":["27021073"],"is_preprint":false},{"year":2016,"finding":"TRPV2 is required for thermogenesis in brown adipose tissue: TRPV2 KO mice show reduced expression of thermogenic genes, impaired β-adrenergic-stimulated thermogenesis, cold intolerance, and increased adiposity; intracellular Ca2+ reduction mimics the KO phenotype.","method":"TRPV2 knockout mice, β-adrenergic stimulation, thermogenic gene expression, body temperature measurement, calcium chelation","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with mechanistic Ca2+ link and multiple physiological readouts","pmids":["26882545"],"is_preprint":false},{"year":2016,"finding":"Heat activation of TRPV2 exhibits strong use dependence: prior heat stimulation lowers temperature activation threshold and slope sensitivity, and sensitizes agonist responses, while prior agonist activation does not sensitize heat responses. This indicates separate temperature-sensing and agonist-activation pathways within the channel.","method":"Whole-cell and excised patch electrophysiology with defined heat and agonist protocols","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 — rigorous electrophysiology dissecting two distinct activation pathways","pmids":["27074678"],"is_preprint":false},{"year":2016,"finding":"TRPV2 activation by LL-37 peptide promotes cancer cell migration via PI3K/AKT-dependent recruitment of TRPV2 to pseudopodia, with Ca2+ entry through TRPV2 cooperating with K+ efflux through BKCa channels; D-enantiomer of LL-37 produces identical effects, suggesting membrane physical property modification rather than receptor binding is the mechanism.","method":"Ca2+ imaging, siRNA knockdown, PI3K inhibitor, migration assays, membrane fluidity measurement","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2–3 — pharmacological and genetic approaches with mechanistic interpretation","pmids":["26993604"],"is_preprint":false},{"year":2016,"finding":"TRPV2 activation inhibits brown adipocyte differentiation in a dose-dependent manner during early differentiation; this inhibition is reversed by a TRPV2 antagonist and is absent in TRPV2 KO cells; calcineurin inhibitors partially rescue the inhibition, implicating a calcineurin-dependent pathway.","method":"TRPV2 agonists/antagonists, TRPV2 KO cells, calcineurin inhibitors (cyclosporine A, FK506), differentiation assays","journal":"Pflügers Archiv","confidence":"Medium","confidence_rationale":"Tier 2 — KO cells plus pharmacological pathway dissection","pmids":["27318696"],"is_preprint":false},{"year":2016,"finding":"TRPV2 contributes to stretch-activated cation currents and myogenic constriction in retinal arterioles: direct membrane stretch triggers cation currents blocked by tranilast and TRPV2 pore-blocking antibodies, and mimicked by Δ9-THC; preincubation with blocking antibodies prevents myogenic tone development.","method":"Patch-clamp electrophysiology, Fura-2 Ca2+ imaging, TRPV2 pore-blocking antibodies, Δ9-THC activation, pressure myography","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 — multiple approaches including specific pore-blocking antibodies and functional myogenic readout","pmids":["27784066"],"is_preprint":false},{"year":2017,"finding":"LPI activates TRPV2 via GPR55-mediated Gq/G12/13 signaling, leading to actin reorganization and TRPV2 translocation to the plasma membrane, Ca2+ influx, and GLP-1 secretion from enteroendocrine L cells; TRPV2 blockage or silencing suppresses both LPI-induced Ca2+ elevation and GLP-1 secretion.","method":"Ca2+ imaging, siRNA knockdown, GPR55 antagonist, TRPV2 antagonist, TRPV2 translocation imaging, GLP-1 secretion assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple approaches but pathway partially inferred","pmids":["28533434"],"is_preprint":false},{"year":2018,"finding":"Crystal structures of rabbit TRPV2 in Ca2+-bound and resiniferatoxin (RTx)+Ca2+-bound forms (3.9 Å and 3.1 Å) show that RTx binding induces two-fold symmetric opening of the selectivity filter wide enough for large organic cation permeation, establishing a structural basis for Ca2+ and large organic cation permeation.","method":"X-ray crystallography (3.1 Å and 3.9 Å), functional characterization of ion permeation","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structures with functional validation","pmids":["29728656"],"is_preprint":false},{"year":2018,"finding":"TRPV2 pore turret is critical for channel activity; cryo-EM structures of rat TRPV2 with and without intact pore turret (3.6–4.0 Å) reveal fully open and partially open states with unoccupied vanilloid pockets, and suggest lipid binding to the lower gate couples to the upper gate through a pore-turret-facilitated mechanism.","method":"Cryo-EM (3.6–4.0 Å), activity assays comparing channels with and without pore turret","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures with functional validation across turret variants","pmids":["30598551"],"is_preprint":false},{"year":2018,"finding":"TRPV2 is required for mechanical nociception: PSN-specific TRPV2 KO mice are deficient in tail-pressure and von Frey responses but have normal heat and tactile responses; cultured KO neurons lack fast-decay, high-threshold stretch-evoked Ca2+ responses.","method":"Conditional TRPV2 knockout mice, behavioral testing (tail-pressure, von Frey, heat), stretch-evoked Ca2+ imaging of cultured primary sensory neurons","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with behavioral and cellular mechanistic readouts","pmids":["30429536"],"is_preprint":false},{"year":2019,"finding":"CBD binds to a hydrophobic pocket between S5 and S6 helices of adjacent TRPV2 subunits (distinct from known TRP ligand sites), and the S4-S5 linker plays a critical role in gating upon CBD binding; cryo-EM reveals two distinct apo states in lipid nanodiscs.","method":"Cryo-EM of full-length rat TRPV2 in nanodiscs (apo and CBD-bound states), mutagenesis, electrophysiology","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures with mutagenesis validation of binding site and gating mechanism","pmids":["31566564"],"is_preprint":false},{"year":2019,"finding":"Oxidation of methionine residues M528 and M607 activates and sensitizes TRPV2 in a temperature-dependent manner; substitution of both residues to isoleucine almost abolishes oxidation-induced gating; this mechanism is relevant for macrophage phagocytosis, which is reduced by reducing agents or ROS scavengers.","method":"Inside-out patch-clamp, site-directed mutagenesis (M528I, M607I), mass spectrometry of purified rat TRPV2, macrophage phagocytosis assay, DTT/methionine sulfoxide reductase treatment","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in excised patches, mutagenesis, mass spectrometry, and functional cell assay","pmids":["31719194"],"is_preprint":false},{"year":2019,"finding":"Resiniferatoxin (RTx) induces two-fold symmetric conformations of TRPV2 both in amphipol and in lipid nanodiscs, with more pronounced two-fold symmetry in the native-like lipid environment, indicating symmetry transitions are part of the TRPV2 gating pathway.","method":"Cryo-EM of full-length rabbit TRPV2 with RTx in nanodiscs and amphipol","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM in two environments with ligand-dependent conformational analysis","pmids":["31090543"],"is_preprint":false},{"year":2010,"finding":"A calmodulin (CaM) binding site exists in the C-terminal domain of TRPV2 (residues 654–683, 1-5-10 motif); single mutations R679A and K681A reduce CaM binding affinity by 50%, and double mutation K661A/K664A reduces affinity by 75%, demonstrating Ca2+-dependent CaM regulation of TRPV2.","method":"In vitro calmodulin binding assays, site-directed mutagenesis of C-terminal peptides","journal":"Amino acids","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro binding assay with mutagenesis, but not yet confirmed in full-length channel context","pmids":["20686800"],"is_preprint":false},{"year":2021,"finding":"Piperlongumine (PL) binds to a transient allosteric pocket in TRPV2 (cryo-EM structure); Arg539 and Thr522 are key residues for PL's antagonistic effect on Ca2+ influx; TRPV2 downregulation reduces PL sensitivity and ROS production in glioblastoma cells.","method":"Cryo-EM of full-length rat TRPV2 with PL, Ca2+ imaging, mutagenesis (Arg539, Thr522), siRNA knockdown, ROS measurement, in vivo orthotopic GBM models","journal":"ACS central science","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with mutagenesis and functional validation in vitro and in vivo","pmids":["34079902"],"is_preprint":false},{"year":2022,"finding":"2-APB binds to a TRPV2-specific site at the interface of S5 of one monomer and the S4-S5 linker of the adjacent monomer (cryo-EM); His521 and Arg539 are key for 2-APB activation; CBD and 2-APB can bind simultaneously to TRPV2 with synergistic activation.","method":"Cryo-EM of rat TRPV2 in lipid nanodiscs with 2-APB and CBD, in silico docking, electrophysiology, mutagenesis (His521, Arg539)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures of multiple functional states with mutagenesis and electrophysiology","pmids":["35484159"],"is_preprint":false},{"year":2022,"finding":"Cholesterol binds inside the vanilloid binding pocket (VBP) of TRPV2 in a 'head down, tail up' configuration and antagonizes ligand activation; estradiol potentiates TRPV2 activation by 2-APB by displacing cholesterol from VBP; cryo-EM resolves cholesterol, MβCD-treated, and E2+2-APB structures at 2.8–3.3 Å.","method":"Cryo-EM at 2.8–3.3 Å, methyl-β-cyclodextrin cholesterol depletion, electrophysiology, functional assays","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM with multiple ligand-bound states and functional validation","pmids":["36163384"],"is_preprint":false},{"year":2022,"finding":"JAK1 phosphorylates TRPV2 at Tyr335, Tyr471, and Tyr525, altering its chemical and thermal sensitivities; PTPN1 dephosphorylates these sites; JAK1-mediated phosphorylation is required for maintaining TRPV2 activity and macrophage phagocytic ability.","method":"Electrophysiology in bone marrow-derived macrophages and DRG neurons, mutagenesis, kinase/phosphatase assays, siRNA knockdown of JAK1 and PTPN1, phagocytosis assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 — identified writer (JAK1) and eraser (PTPN1) with specific phosphosites and functional consequences","pmids":["35686730"],"is_preprint":false},{"year":2022,"finding":"TRPV2 in myeloid cells facilitates virus penetration by promoting cell membrane tension and mobility through the Ca2+-LRMDA axis; TRPV2 KO suppresses viral infection and reduces membrane tension; Ca2+-impermeable TRPV2E572Q fails to rescue viral infection in KO cells; LRMDA knockdown phenocopies TRPV2 KO.","method":"Conditional TRPV2 KO (LyZ2-Cre;Trpv2fl/fl), TRPV2E572Q reconstitution, LRMDA knockdown, membrane tension measurement, viral infection assays (HSV-1, VSV), in vivo mouse infection model","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 2 — conditional KO, Ca2+-impermeable mutant rescue, downstream effector (LRMDA) identified","pmids":["36261399"],"is_preprint":false},{"year":2023,"finding":"Replication stress generates cytosolic ssDNA and dsDNA that activate cGAS, producing cGAMP which binds to STING, causing STING dissociation from TRPV2 and derepression of TRPV2, leading to Ca2+ release from the ER and activation of CaMKK2/AMPK to protect stalled replication forks from Exo1-mediated degradation.","method":"TRPV2 KO/knockdown, cGAS/STING epistasis (genetic and pharmacological), Ca2+ imaging, STING-TRPV2 interaction (Co-IP), fork protection assays, Exo1 degradation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — epistasis, Co-IP, Ca2+ imaging, and functional fork protection assays establish pathway position","pmids":["36696898"],"is_preprint":false},{"year":2023,"finding":"CBD sensitizes TRPV2 responses to 2-APB by over two orders of magnitude; cryo-EM reveals a new small-molecule binding site in the pore domain of rTRPV2 in addition to the known CBD site; strong sensitization is TRPV2/TRPV3-specific and does not originate solely from amino acid differences at the CBD or pore domain sites.","method":"Patch-clamp electrophysiology, cryo-EM, mutagenesis at non-conserved positions between rTRPV2 and rTRPV1","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure plus electrophysiology and mutagenesis","pmids":["37199723"],"is_preprint":false},{"year":2023,"finding":"TRPV2 localizes to the leading edge and nascent adhesions of invasive melanoma cells, regulating Ca2+-mediated calpain activation and talin cleavage, as well as F-actin organization, thereby promoting migration and invasion; TRPV2 silencing in highly metastatic cells prevents aggressive in vitro and in vivo behavior.","method":"siRNA knockdown, live imaging of TRPV2 localization (leading edge/adhesions), calpain activity assay, talin cleavage assay, F-actin analysis, in vivo xenograft metastasis assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — mechanistic dissection via calpain/talin pathway with genetic KD and in vivo validation","pmids":["36744297"],"is_preprint":false},{"year":2019,"finding":"TRPV2 mediates cell swelling (hypotonic stimulation)-induced Ca2+ influx and insulin secretion in mouse pancreatic β-cells; probenecid (TRPV2 activator) elevates [Ca2+]c in β-cells, and TRPV2 siRNA knockdown reduces both hypotonic Ca2+ response and insulin secretion.","method":"Fura-2 Ca2+ imaging, siRNA knockdown, ruthenium red/tranilast pharmacology, insulin secretion assay from isolated islets","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA and pharmacology with functional insulin secretion readout","pmids":["30649920"],"is_preprint":false},{"year":2019,"finding":"TRPV2 stimulation suppresses Rac1 and RhoA activation in rheumatoid arthritis fibroblast-like synoviocytes (FLS), reduces integrin localization at the plasma membrane, decreases organized actin filaments, and inhibits FLS invasion; RhoA activators override TRPV2-induced suppression.","method":"TRPV2 stimulation assays, Rac1/RhoA activation assays, integrin localization, actin staining, invasion assays, RhoA activator rescue","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2–3 — functional pathway dissection with rescue experiment but single study","pmids":["30851707"],"is_preprint":false},{"year":2018,"finding":"Phagocytosis in primary human macrophages requires TRPV2-mediated Ca2+ influx, and TRPV2 must be localized to lipid rafts to be functional; P. aeruginosa recruits TRPV2 to the cell surface; cystic fibrosis macrophages have deficient TRPV2 function contributing to impaired phagocytosis.","method":"Ca2+ imaging, lipid raft fractionation, TRPV2 surface recruitment assay, phagocytosis assays, siRNA knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — lipid raft fractionation plus functional phagocytosis readout in primary human cells","pmids":["29523858"],"is_preprint":false},{"year":2023,"finding":"A selective TRPV2 inhibitor (IV2-1) blocks TRPV2-mediated Ca2+ influx and shapes Ca2+ microdomains at the cell margin in macrophages; TRPV2 inhibition reduces phagocytosis and LPS-induced migration, while TRPV2 activation promotes migration; TRPV2-generated Ca2+ microdomains are important for phagocytosis and migration.","method":"Ca2+ influx assay (HEK293 expressing rat TRPV2), patch-clamp, TIRFM Ca2+ microdomain imaging in macrophages, siRNA knockdown, phagocytosis and migration assays","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 2 — selective inhibitor plus siRNA confirmed specificity; TIRFM provides subcellular mechanistic insight","pmids":["37254803"],"is_preprint":false}],"current_model":"TRPV2 is a heat- (>52°C), mechano-, and lipid-activated Ca2+-permeable nonselective cation channel that resides predominantly in the ER/intracellular membranes under basal conditions and translocates to the plasma membrane upon PI3K/Akt activation by growth factors, lysophospholipids, or mechanical stress; at the membrane it mediates Ca2+ influx that drives diverse downstream processes including macrophage phagocytosis (via PIP2 synthesis and receptor clustering), cardiac mechanotransduction (via IGF-1/PI3K/Akt), insulin secretion (via PI3K-dependent translocation), and cell migration (via calpain/talin/RhoA pathways); channel gating is regulated by PIP2 hydrolysis (desensitization), JAK1-mediated tyrosine phosphorylation (sensitization), cholesterol occupancy of the vanilloid binding pocket (inhibition), and oxidation of M528/M607 (activation); structural studies have defined ligand-binding sites for CBD (S5-S6 hydrophobic pocket), 2-APB (S5/S4-S5 linker interface), cholesterol (vanilloid pocket), and piperlongumine (allosteric pocket), and have revealed symmetry transitions and selectivity filter conformational changes underlying gating."},"narrative":{"teleology":[{"year":1999,"claim":"Identification of TRPV2 (VRL-1) as a high-threshold thermosensor established that a second TRP channel senses noxious heat (>52°C) independently of TRPV1, without capsaicin or proton sensitivity.","evidence":"Heterologous expression and patch-clamp electrophysiology with defined thermal stimuli","pmids":["15665528","14622291"],"confidence":"High","gaps":["Endogenous in vivo heat-sensing role later questioned by knockout studies","Species-dependent activation differences not yet recognized"]},{"year":2004,"claim":"Discovery that 2-APB directly activates TRPV2 provided the first widely used chemical agonist and suggested a shared activation mechanism across TRPV1–3.","evidence":"Calcium imaging and electrophysiology in HEK293 cells and Xenopus oocytes","pmids":["15194687","17217057"],"confidence":"High","gaps":["2-APB binding site unknown at this time","Mechanism of activation not structurally resolved"]},{"year":2007,"claim":"Demonstration that PI3K-dependent translocation from ER to plasma membrane is required for macrophage Ca²⁺ entry and migration established the regulated trafficking paradigm central to TRPV2 biology.","evidence":"GFP-TRPV2 live imaging, patch-clamp, PI3K inhibitor, pertussis toxin, siRNA, and dominant-negative TRPV2 in macrophages","pmids":["17154364","16533525"],"confidence":"High","gaps":["Direct mechanism coupling PI3K to vesicle insertion not defined","Whether PI3K also modulates channel gating independently of trafficking was debated"]},{"year":2008,"claim":"CBD was identified as a potent TRPV2 agonist (EC₅₀ ~3.7 µM), and insulin was shown to drive TRPV2 translocation in β-cells potentiating glucose-stimulated insulin secretion, broadening the channel's physiological ligand and tissue repertoire.","evidence":"Ca²⁺ mobilization, siRNA knockdown, CGRP release in DRG neurons; GFP-TRPV2 translocation imaging and shRNA in β-cells with insulin receptor KO","pmids":["18550765","18984736"],"confidence":"High","gaps":["CBD binding site unknown","Molecular mechanism of insulin-induced translocation not fully resolved"]},{"year":2010,"claim":"TRPV2 was shown to be essential for macrophage phagocytosis through a mechanism linking channel-mediated depolarization to PIP₂ synthesis and phagocytic receptor clustering, with knockout mice exhibiting accelerated mortality to bacterial infection.","evidence":"TRPV2 KO macrophages, phagocytosis assays, PIP₂ measurement, live imaging, in vivo Listeria infection model","pmids":["20118928"],"confidence":"High","gaps":["How depolarization specifically promotes PIP₂ synthesis not fully explained","Relative contribution of TRPV2 vs other channels in innate immunity unclear"]},{"year":2010,"claim":"PIP₂ hydrolysis was identified as the mechanism of Ca²⁺-dependent TRPV2 desensitization, independent of calmodulin, resolving a key question about negative feedback on channel activity.","evidence":"Simultaneous confocal PIP₂ probe imaging and patch-clamp electrophysiology with calmodulin inhibitors","pmids":["20926660"],"confidence":"High","gaps":["Whether PIP₂ binds directly to TRPV2 or acts indirectly not structurally resolved","Calmodulin C-terminal binding site identified in vitro (PMID:20686800) but functional significance in full-length channel not established"]},{"year":2014,"claim":"Conditional cardiac knockout revealed that TRPV2 is essential for maintaining intercalated disc integrity, conduction, and Ca²⁺ handling through IGF-1/PI3K/Akt signaling, establishing its non-redundant role in cardiac mechanotransduction.","evidence":"Cardiac-specific inducible TRPV2 KO mice with echocardiography, single-myocyte Ca²⁺ imaging, and IGF-1 rescue","pmids":["24874017"],"confidence":"High","gaps":["Direct mechanosensing mechanism in cardiomyocytes not defined","Whether TRPV2 functions as a primary mechanosensor or secondary effector unresolved"]},{"year":2016,"claim":"First cryo-EM structures of TRPV2 (~4–5 Å) revealed the overall architecture including dual pore constrictions and suggested that ankyrin-repeat domain rotation couples to pore opening via the TRP domain, providing the structural foundation for gating models.","evidence":"Cryo-EM of full-length rabbit TRPV2 with structural comparison to TRPV1","pmids":["26779611","27021073"],"confidence":"High","gaps":["Resolution insufficient for atomic detail of ligand binding","No agonist-bound structures at this stage"]},{"year":2016,"claim":"TRPV2 KO mice showed impaired brown adipose thermogenesis and cold intolerance, identifying an unexpected physiological role for the channel in energy metabolism beyond sensory neurons.","evidence":"TRPV2 KO mice, β-adrenergic stimulation, thermogenic gene expression, body temperature, Ca²⁺ chelation","pmids":["26882545"],"confidence":"High","gaps":["Molecular mechanism linking TRPV2 Ca²⁺ to thermogenic gene expression not fully defined","Cell-type specificity of TRPV2 action in BAT not resolved"]},{"year":2018,"claim":"High-resolution crystal and cryo-EM structures (3.1–4.0 Å) of RTx-bound and turret-modified TRPV2 revealed that agonist binding induces two-fold symmetric selectivity filter opening permitting large organic cation permeation, and that the pore turret couples lipid binding to upper gate conformation.","evidence":"X-ray crystallography and cryo-EM of rabbit and rat TRPV2 with RTx, Ca²⁺, and turret modifications","pmids":["29728656","30598551"],"confidence":"High","gaps":["Physiological relevance of C₂-symmetric intermediate unclear","Full gating cycle not captured"]},{"year":2018,"claim":"Sensory neuron-specific TRPV2 KO established the channel as a bona fide mechanical nociceptor for high-threshold stimuli, while its role as an in vivo heat sensor in mammals was not confirmed.","evidence":"Conditional KO (Advillin-Cre), behavioral testing (tail-pressure, von Frey, heat), stretch-evoked Ca²⁺ imaging","pmids":["30429536"],"confidence":"High","gaps":["Molecular mechanism of mechanosensitivity (direct vs indirect) not resolved","Whether TRPV2 senses membrane stretch directly or through accessory proteins unclear"]},{"year":2019,"claim":"CBD and RTx binding sites were structurally mapped—CBD to a novel S5–S6 inter-subunit pocket and RTx inducing C₂-symmetric intermediates in native lipid—establishing that TRPV2 harbors multiple distinct ligand-binding sites that can drive different conformational pathways.","evidence":"Cryo-EM of rat TRPV2 in nanodiscs (apo and CBD-bound), rabbit TRPV2 with RTx in nanodiscs and amphipol; mutagenesis and electrophysiology","pmids":["31566564","31090543"],"confidence":"High","gaps":["How CBD and RTx pathways converge on pore opening not fully integrated","Endogenous lipid ligands occupying these sites not identified"]},{"year":2019,"claim":"Oxidation of M528 and M607 was identified as a direct gating mechanism that activates and sensitizes TRPV2 in a temperature-dependent manner, linking ROS signaling to channel function and macrophage phagocytosis.","evidence":"Inside-out patch-clamp, M528I/M607I mutagenesis, mass spectrometry, phagocytosis assay with reducing agents","pmids":["31719194"],"confidence":"High","gaps":["Structural basis of oxidation-induced conformational change unknown","Relative contribution of oxidation vs other gating stimuli in vivo not quantified"]},{"year":2022,"claim":"High-resolution cryo-EM (2.8–3.3 Å) revealed cholesterol bound in the vanilloid pocket inhibiting TRPV2, and showed estradiol potentiates activation by displacing cholesterol; the 2-APB binding site was mapped to the S5/S4-S5 linker interface, establishing the structural basis for lipid and small-molecule modulation of the vanilloid pocket.","evidence":"Cryo-EM with cholesterol, MβCD-treated, estradiol+2-APB, and CBD+2-APB states; mutagenesis of His521 and Arg539; electrophysiology","pmids":["36163384","35484159"],"confidence":"High","gaps":["Whether cholesterol regulation operates in vivo under physiological conditions not tested","Full integration of all ligand sites into a unified gating model not achieved"]},{"year":2022,"claim":"JAK1 was identified as the kinase phosphorylating TRPV2 at Y335/Y471/Y525 to sensitize channel activity, with PTPN1 as the opposing phosphatase, establishing a reversible post-translational regulatory axis critical for macrophage phagocytosis.","evidence":"Electrophysiology in macrophages and DRG neurons, mutagenesis, kinase/phosphatase assays, siRNA of JAK1/PTPN1, phagocytosis assay","pmids":["35686730"],"confidence":"High","gaps":["Signaling events upstream of JAK1 that trigger TRPV2 phosphorylation not defined","Whether other kinases contribute in different cell types unknown"]},{"year":2023,"claim":"A cGAS–STING–TRPV2 axis was discovered in which replication stress activates cGAS/STING, causing STING dissociation from TRPV2 at the ER, derepressing TRPV2-mediated Ca²⁺ release that activates CaMKK2/AMPK to protect stalled replication forks from Exo1 degradation.","evidence":"TRPV2 KO/KD, cGAS/STING epistasis, Co-IP of STING–TRPV2, Ca²⁺ imaging, fork protection assays","pmids":["36696898"],"confidence":"High","gaps":["Whether STING directly gates TRPV2 or acts through an intermediary not clear","Structural basis of STING–TRPV2 interaction unknown","Generalizability beyond the cell lines tested not established"]},{"year":2023,"claim":"TRPV2 was shown to localize to leading edges and nascent adhesions in invasive melanoma, where it drives Ca²⁺-dependent calpain activation, talin cleavage, and F-actin reorganization to promote migration and metastasis.","evidence":"siRNA knockdown, live imaging of TRPV2 localization, calpain/talin cleavage assays, in vivo xenograft metastasis model","pmids":["36744297"],"confidence":"High","gaps":["Whether TRPV2 is activated by mechanical cues at the leading edge or by lipid/chemical signals not distinguished","Therapeutic relevance of TRPV2 inhibition in metastasis not clinically validated"]},{"year":null,"claim":"Key unresolved questions include whether TRPV2 is a direct mechanosensor or requires accessory proteins, the identity of endogenous lipid ligands occupying the vanilloid and CBD pockets, a unified structural model integrating all gating stimuli, and the in vivo relevance of TRPV2 as a thermosensor in mammals.","evidence":"","pmids":[],"confidence":"Low","gaps":["Direct vs indirect mechanosensitivity remains unresolved","No endogenous lipid ligands confirmed for the CBD or vanilloid pockets","Complete gating cycle with all modulators not structurally captured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,5,20,27,40]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,20,27]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,6,37]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,6,8,11,15,16,42]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,29,35,42,43]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,7,11,14,37]}],"complexes":[],"partners":["STING1","JAK1","PTPN1","LRMDA"],"other_free_text":[]},"mechanistic_narrative":"TRPV2 is a Ca²⁺-permeable nonselective cation channel that functions as a polymodal sensor of noxious heat, mechanical force, and lipid signals, translating these stimuli into Ca²⁺ influx to drive macrophage phagocytosis, cardiac mechanotransduction, insulin secretion, thermogenesis, and cell migration. Under basal conditions TRPV2 resides predominantly in intracellular (ER) membranes and translocates to the plasma membrane via PI3K/Akt- and Rac-dependent pathways triggered by growth factors, chemotactic peptides, or mechanical stress [PMID:17154364, PMID:20854263, PMID:25677550]; at the plasma membrane it generates Ca²⁺ microdomains that activate downstream effectors including PIP₂ synthesis for phagocytic receptor clustering, CaMKII in cardiomyocytes, calpain/talin cleavage in migrating cells, and CaMKK2/AMPK during replication stress [PMID:20118928, PMID:23786999, PMID:36744297, PMID:36696898]. Channel gating is regulated by PIP₂ hydrolysis (desensitization), JAK1-mediated tyrosine phosphorylation at Y335/Y471/Y525 (sensitization), cholesterol occupancy of the vanilloid binding pocket (inhibition), and oxidation of M528/M607 (activation), while cryo-EM and crystallographic structures have defined distinct ligand-binding sites for CBD, 2-APB, cholesterol, and piperlongumine and revealed C₂-symmetric intermediates during pore opening [PMID:20926660, PMID:35686730, PMID:36163384, PMID:31719194, PMID:35484159, PMID:31566564]. Conditional cardiac TRPV2 knockout causes rapid intercalated disc disorganization, conduction defects, and impaired IGF-1/PI3K/Akt signaling, while sarcolemmal TRPV2 accumulation drives pathological Ca²⁺ entry in dilated cardiomyopathy and Duchenne muscular dystrophy models [PMID:24874017, PMID:23786999, PMID:25616416]."},"prefetch_data":{"uniprot":{"accession":"Q9Y5S1","full_name":"Transient receptor potential cation channel subfamily V member 2","aliases":["Osm-9-like TRP channel 2","OTRPC2","Vanilloid receptor-like protein 1","VRL-1"],"length_aa":764,"mass_kda":86.0,"function":"Calcium-permeable, non-selective cation channel (PubMed:10201375). Seems to be regulated, at least in part, by growth factors, such as IGF1, PDGF and morphogenetic neuropeptide/head activator. May transduce physical stimuli in mast cells (By similarity)","subcellular_location":"Cell membrane; Cytoplasm; Melanosome","url":"https://www.uniprot.org/uniprotkb/Q9Y5S1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRPV2","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRPV2","total_profiled":1310},"omim":[{"mim_id":"606676","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY V, MEMBER 2; TRPV2","url":"https://www.omim.org/entry/606676"},{"mim_id":"605427","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY V, MEMBER 4; TRPV4","url":"https://www.omim.org/entry/605427"},{"mim_id":"310200","title":"MUSCULAR DYSTROPHY, DUCHENNE TYPE; DMD","url":"https://www.omim.org/entry/310200"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRPV2"},"hgnc":{"alias_symbol":["VRL","VRL-1","VRL1"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y5S1","domains":[{"cath_id":"1.25.40.20","chopping":"12-20_42-62_71-217","consensus_level":"medium","plddt":85.2575,"start":12,"end":217},{"cath_id":"1.25.40","chopping":"238-317","consensus_level":"medium","plddt":91.5899,"start":238,"end":317},{"cath_id":"-","chopping":"386-414_426-517","consensus_level":"medium","plddt":87.1475,"start":386,"end":517}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5S1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5S1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5S1-F1-predicted_aligned_error_v6.png","plddt_mean":78.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRPV2","jax_strain_url":"https://www.jax.org/strain/search?query=TRPV2"},"sequence":{"accession":"Q9Y5S1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y5S1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y5S1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5S1"}},"corpus_meta":[{"pmid":"15194687","id":"PMC_15194687","title":"2-aminoethoxydiphenyl 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Chimeric and deletion studies show both the N- and C-terminal cytoplasmic domains of rat TRPV2 are important for heat and 2-APB responses and can act in trans.\",\n      \"method\": \"Calcium imaging, electrophysiology, chimera/deletion mutagenesis in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro mutagenesis combined with electrophysiology and calcium assays\",\n      \"pmids\": [\"17395593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Cannabidiol (CBD) activates TRPV2 (EC50 = 3.7 µM) and evokes CGRP release from dorsal root ganglion neurons in a TRPV1- and cannabinoid-receptor-independent, extracellular Ca2+-dependent manner, as confirmed by siRNA knockdown of TRPV2.\",\n      \"method\": \"Calcium mobilization assays, electrophysiology, siRNA knockdown, CGRP release assay, ruthenium red block\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods; siRNA confirms TRPV2 specificity\",\n      \"pmids\": [\"18550765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Insulin induces translocation of TRPV2 from the cytoplasm/ER to the plasma membrane in pancreatic β-cells via the insulin receptor/PI3K pathway, increasing calcium entry and potentiating glucose-stimulated insulin secretion.\",\n      \"method\": \"GFP/c-Myc-tagged TRPV2 translocation imaging, Fura-2 calcium imaging, shRNA knockdown, insulin receptor knockout β-cells, tranilast pharmacology\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches including genetic KO and live imaging\",\n      \"pmids\": [\"18984736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Lysophospholipids (lysophosphatidylcholine and lysophosphatidylinositol) activate TRPV2 via Gq/Go-protein and PI3,4-kinase signaling, causing TRPV2 translocation to the plasma membrane and stimulating prostate cancer cell migration.\",\n      \"method\": \"Calcium imaging, pharmacology (Gq/Go inhibitors, PI3K inhibitor), TRPV2 surface trafficking assay, migration assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple methods but partial mechanistic resolution of signaling cascade\",\n      \"pmids\": [\"19321128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRPV2 is required for macrophage particle binding and phagocytosis; it is recruited to the nascent phagosome, depolarizes the plasma membrane, and this depolarization increases PtdIns(4,5)P2 synthesis, triggering actin depolymerization necessary for phagocytic receptor clustering. TRPV2-deficient mice show accelerated mortality to Listeria monocytogenes.\",\n      \"method\": \"TRPV2 knockout macrophages, phagocytosis assays (zymosan, IgG, complement), live imaging, PtdIns(4,5)P2 measurement, in vivo infection model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic dissection (PIP2 measurement, receptor clustering), replicated with in vivo data\",\n      \"pmids\": [\"20118928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ca2+-dependent desensitization of TRPV2 is mediated by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) and is independent of calmodulin, as shown by simultaneous confocal imaging of a fluorescent PIP2-binding probe and electrophysiological recording.\",\n      \"method\": \"Whole-cell patch-clamp, confocal imaging of PIP2-binding probe, calmodulin inhibitors, mutant calmodulin coexpression\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — simultaneous imaging and electrophysiology with multiple pharmacological controls in single study\",\n      \"pmids\": [\"20926660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RANKL-induced TRPV2 expression in preosteoclasts drives Ca2+ oscillations and activates NFATc1, promoting osteoclastogenesis; TRPV2 silencing reduces Ca2+ oscillation frequency, NFATc1 nuclear translocation, and osteoclast differentiation.\",\n      \"method\": \"DNA microarray, siRNA knockdown, patch-clamp, Ca2+ imaging, NFATc1 nuclear translocation assay\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA plus electrophysiology and imaging in single study\",\n      \"pmids\": [\"20980052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PI3K/Akt signaling promotes insulin-induced TRPV2 translocation to the plasma membrane in pancreatic β-cells, accelerating first-phase glucose-stimulated insulin secretion; this is blocked by PI3K inhibition, tranilast, or TRPV2 shRNA.\",\n      \"method\": \"Total internal reflection fluorescent microscopy, Ca2+ imaging, shRNA knockdown, PI3K inhibitor, tranilast\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — TIRF live imaging of translocation with genetic and pharmacological confirmation\",\n      \"pmids\": [\"20854263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPV2 localizes to podosomes in macrophages and increases submembrane Ca2+ concentration ([Ca2+]pm) at these sites; elevated [Ca2+]pm activates Pyk2 phosphorylation and negatively regulates podosome assembly; fMLP increases TRPV2 at the podosome.\",\n      \"method\": \"TIRFM imaging, c-Myc tagged TRPV2 surface expression, ruthenium red pharmacology, dominant-negative Pyk2, siRNA knockdown\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — live imaging with functional readouts in single study\",\n      \"pmids\": [\"22226146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRPV2 sarcolemmal accumulation in dilated cardiomyopathy (DCM) drives pathological Ca2+ entry and activates CaMKII and ROS production; blocking sarcolemmal TRPV2 accumulation (via N-terminal domain overexpression or tranilast) reduces ventricular dilation, fibrosis, and improves survival in DCM animal models.\",\n      \"method\": \"Immunological and cell physiological analyses, Western blot, transgenic/adenoviral overexpression of TRPV2 N-terminal domain, CaMKII phosphorylation assay, ROS measurement, in vivo DCM models\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple animal models with mechanistic endpoint assays (CaMKII, ROS, cardiac function)\",\n      \"pmids\": [\"23786999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRPV2 is critical for cardiac structure and function: conditional TRPV2 knockout in adult mouse hearts causes rapid intercalated disc disorganization, conduction defects, impaired Ca2+ handling, and reduced IGF-1/PI3K/Akt signaling; IGF-1 administration partially rescues these defects.\",\n      \"method\": \"Cardiac-specific inducible TRPV2 knockout mice, echocardiography, Ca2+ imaging of single myocytes, intercalated disc morphology, IGF-1 rescue experiment, stretch-induced Ca2+ and IGF-1 secretion assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with multiple mechanistic readouts and in vivo rescue\",\n      \"pmids\": [\"24874017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRPV2 is translocated to the sarcolemma and T-tubules in dystrophic mdx cardiomyocytes (overexpressed ~2-fold), mediating abnormal stretch-activated Ca2+ influx in Duchenne muscular dystrophy; pore-blocking antibodies and siRNA ablation of TRPV2 protect cells from stress-induced Ca2+ signals.\",\n      \"method\": \"Western blot, immunocytochemistry, biotinylation assay, pharmacological modulators, pore-blocking antibodies, siRNA, confocal Ca2+ imaging\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal tools (antibody block, siRNA, imaging) in mdx model\",\n      \"pmids\": [\"25616416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Focal mechanical stress induces TRPV2 translocation to the stressed membrane site via a PI3K/Rac-dependent mechanism, increasing local submembrane Ca2+ concentration; this is blocked by gadolinium and LY294002.\",\n      \"method\": \"GFP-TRPV2 live imaging, RFP-Akt co-imaging, ruthenium red pharmacology, PI3K inhibitor, dominant-negative Rac, siRNA knockdown\",\n      \"journal\": \"Physiological reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — live imaging with pharmacological and genetic dissection in single study\",\n      \"pmids\": [\"25677550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cryo-EM structure of rabbit TRPV2 at ~4 Å reveals that S6 (gate-forming helix) adopts a different conformation than TRPV1, and structural comparisons suggest that rotation of the ankyrin-repeat domain couples to pore opening via the TRP domain, which can be modulated by S6 secondary structure rearrangements.\",\n      \"method\": \"Cryo-electron microscopy (~4 Å resolution), structural comparison with TRPV1\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic resolution cryo-EM structure with functional interpretation\",\n      \"pmids\": [\"26779611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Full-length TRPV2 cryo-EM structure (~5 Å) reveals two constrictions (upper and lower gates) similar to TRPV1, but with wider upper and lower gates in the agonist-free state compared to closed and agonist-activated TRPV1, providing structural basis for TRPV channel diversity.\",\n      \"method\": \"Cryo-electron microscopy (~5 Å resolution), structural comparison with TRPV1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic resolution cryo-EM of full-length channel\",\n      \"pmids\": [\"27021073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPV2 is required for thermogenesis in brown adipose tissue: TRPV2 KO mice show reduced expression of thermogenic genes, impaired β-adrenergic-stimulated thermogenesis, cold intolerance, and increased adiposity; intracellular Ca2+ reduction mimics the KO phenotype.\",\n      \"method\": \"TRPV2 knockout mice, β-adrenergic stimulation, thermogenic gene expression, body temperature measurement, calcium chelation\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic Ca2+ link and multiple physiological readouts\",\n      \"pmids\": [\"26882545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Heat activation of TRPV2 exhibits strong use dependence: prior heat stimulation lowers temperature activation threshold and slope sensitivity, and sensitizes agonist responses, while prior agonist activation does not sensitize heat responses. This indicates separate temperature-sensing and agonist-activation pathways within the channel.\",\n      \"method\": \"Whole-cell and excised patch electrophysiology with defined heat and agonist protocols\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous electrophysiology dissecting two distinct activation pathways\",\n      \"pmids\": [\"27074678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPV2 activation by LL-37 peptide promotes cancer cell migration via PI3K/AKT-dependent recruitment of TRPV2 to pseudopodia, with Ca2+ entry through TRPV2 cooperating with K+ efflux through BKCa channels; D-enantiomer of LL-37 produces identical effects, suggesting membrane physical property modification rather than receptor binding is the mechanism.\",\n      \"method\": \"Ca2+ imaging, siRNA knockdown, PI3K inhibitor, migration assays, membrane fluidity measurement\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pharmacological and genetic approaches with mechanistic interpretation\",\n      \"pmids\": [\"26993604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPV2 activation inhibits brown adipocyte differentiation in a dose-dependent manner during early differentiation; this inhibition is reversed by a TRPV2 antagonist and is absent in TRPV2 KO cells; calcineurin inhibitors partially rescue the inhibition, implicating a calcineurin-dependent pathway.\",\n      \"method\": \"TRPV2 agonists/antagonists, TRPV2 KO cells, calcineurin inhibitors (cyclosporine A, FK506), differentiation assays\",\n      \"journal\": \"Pflügers Archiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO cells plus pharmacological pathway dissection\",\n      \"pmids\": [\"27318696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPV2 contributes to stretch-activated cation currents and myogenic constriction in retinal arterioles: direct membrane stretch triggers cation currents blocked by tranilast and TRPV2 pore-blocking antibodies, and mimicked by Δ9-THC; preincubation with blocking antibodies prevents myogenic tone development.\",\n      \"method\": \"Patch-clamp electrophysiology, Fura-2 Ca2+ imaging, TRPV2 pore-blocking antibodies, Δ9-THC activation, pressure myography\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple approaches including specific pore-blocking antibodies and functional myogenic readout\",\n      \"pmids\": [\"27784066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LPI activates TRPV2 via GPR55-mediated Gq/G12/13 signaling, leading to actin reorganization and TRPV2 translocation to the plasma membrane, Ca2+ influx, and GLP-1 secretion from enteroendocrine L cells; TRPV2 blockage or silencing suppresses both LPI-induced Ca2+ elevation and GLP-1 secretion.\",\n      \"method\": \"Ca2+ imaging, siRNA knockdown, GPR55 antagonist, TRPV2 antagonist, TRPV2 translocation imaging, GLP-1 secretion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple approaches but pathway partially inferred\",\n      \"pmids\": [\"28533434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structures of rabbit TRPV2 in Ca2+-bound and resiniferatoxin (RTx)+Ca2+-bound forms (3.9 Å and 3.1 Å) show that RTx binding induces two-fold symmetric opening of the selectivity filter wide enough for large organic cation permeation, establishing a structural basis for Ca2+ and large organic cation permeation.\",\n      \"method\": \"X-ray crystallography (3.1 Å and 3.9 Å), functional characterization of ion permeation\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structures with functional validation\",\n      \"pmids\": [\"29728656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPV2 pore turret is critical for channel activity; cryo-EM structures of rat TRPV2 with and without intact pore turret (3.6–4.0 Å) reveal fully open and partially open states with unoccupied vanilloid pockets, and suggest lipid binding to the lower gate couples to the upper gate through a pore-turret-facilitated mechanism.\",\n      \"method\": \"Cryo-EM (3.6–4.0 Å), activity assays comparing channels with and without pore turret\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures with functional validation across turret variants\",\n      \"pmids\": [\"30598551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPV2 is required for mechanical nociception: PSN-specific TRPV2 KO mice are deficient in tail-pressure and von Frey responses but have normal heat and tactile responses; cultured KO neurons lack fast-decay, high-threshold stretch-evoked Ca2+ responses.\",\n      \"method\": \"Conditional TRPV2 knockout mice, behavioral testing (tail-pressure, von Frey, heat), stretch-evoked Ca2+ imaging of cultured primary sensory neurons\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with behavioral and cellular mechanistic readouts\",\n      \"pmids\": [\"30429536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CBD binds to a hydrophobic pocket between S5 and S6 helices of adjacent TRPV2 subunits (distinct from known TRP ligand sites), and the S4-S5 linker plays a critical role in gating upon CBD binding; cryo-EM reveals two distinct apo states in lipid nanodiscs.\",\n      \"method\": \"Cryo-EM of full-length rat TRPV2 in nanodiscs (apo and CBD-bound states), mutagenesis, electrophysiology\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures with mutagenesis validation of binding site and gating mechanism\",\n      \"pmids\": [\"31566564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Oxidation of methionine residues M528 and M607 activates and sensitizes TRPV2 in a temperature-dependent manner; substitution of both residues to isoleucine almost abolishes oxidation-induced gating; this mechanism is relevant for macrophage phagocytosis, which is reduced by reducing agents or ROS scavengers.\",\n      \"method\": \"Inside-out patch-clamp, site-directed mutagenesis (M528I, M607I), mass spectrometry of purified rat TRPV2, macrophage phagocytosis assay, DTT/methionine sulfoxide reductase treatment\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in excised patches, mutagenesis, mass spectrometry, and functional cell assay\",\n      \"pmids\": [\"31719194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Resiniferatoxin (RTx) induces two-fold symmetric conformations of TRPV2 both in amphipol and in lipid nanodiscs, with more pronounced two-fold symmetry in the native-like lipid environment, indicating symmetry transitions are part of the TRPV2 gating pathway.\",\n      \"method\": \"Cryo-EM of full-length rabbit TRPV2 with RTx in nanodiscs and amphipol\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM in two environments with ligand-dependent conformational analysis\",\n      \"pmids\": [\"31090543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A calmodulin (CaM) binding site exists in the C-terminal domain of TRPV2 (residues 654–683, 1-5-10 motif); single mutations R679A and K681A reduce CaM binding affinity by 50%, and double mutation K661A/K664A reduces affinity by 75%, demonstrating Ca2+-dependent CaM regulation of TRPV2.\",\n      \"method\": \"In vitro calmodulin binding assays, site-directed mutagenesis of C-terminal peptides\",\n      \"journal\": \"Amino acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding assay with mutagenesis, but not yet confirmed in full-length channel context\",\n      \"pmids\": [\"20686800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Piperlongumine (PL) binds to a transient allosteric pocket in TRPV2 (cryo-EM structure); Arg539 and Thr522 are key residues for PL's antagonistic effect on Ca2+ influx; TRPV2 downregulation reduces PL sensitivity and ROS production in glioblastoma cells.\",\n      \"method\": \"Cryo-EM of full-length rat TRPV2 with PL, Ca2+ imaging, mutagenesis (Arg539, Thr522), siRNA knockdown, ROS measurement, in vivo orthotopic GBM models\",\n      \"journal\": \"ACS central science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with mutagenesis and functional validation in vitro and in vivo\",\n      \"pmids\": [\"34079902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"2-APB binds to a TRPV2-specific site at the interface of S5 of one monomer and the S4-S5 linker of the adjacent monomer (cryo-EM); His521 and Arg539 are key for 2-APB activation; CBD and 2-APB can bind simultaneously to TRPV2 with synergistic activation.\",\n      \"method\": \"Cryo-EM of rat TRPV2 in lipid nanodiscs with 2-APB and CBD, in silico docking, electrophysiology, mutagenesis (His521, Arg539)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures of multiple functional states with mutagenesis and electrophysiology\",\n      \"pmids\": [\"35484159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cholesterol binds inside the vanilloid binding pocket (VBP) of TRPV2 in a 'head down, tail up' configuration and antagonizes ligand activation; estradiol potentiates TRPV2 activation by 2-APB by displacing cholesterol from VBP; cryo-EM resolves cholesterol, MβCD-treated, and E2+2-APB structures at 2.8–3.3 Å.\",\n      \"method\": \"Cryo-EM at 2.8–3.3 Å, methyl-β-cyclodextrin cholesterol depletion, electrophysiology, functional assays\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM with multiple ligand-bound states and functional validation\",\n      \"pmids\": [\"36163384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"JAK1 phosphorylates TRPV2 at Tyr335, Tyr471, and Tyr525, altering its chemical and thermal sensitivities; PTPN1 dephosphorylates these sites; JAK1-mediated phosphorylation is required for maintaining TRPV2 activity and macrophage phagocytic ability.\",\n      \"method\": \"Electrophysiology in bone marrow-derived macrophages and DRG neurons, mutagenesis, kinase/phosphatase assays, siRNA knockdown of JAK1 and PTPN1, phagocytosis assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — identified writer (JAK1) and eraser (PTPN1) with specific phosphosites and functional consequences\",\n      \"pmids\": [\"35686730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRPV2 in myeloid cells facilitates virus penetration by promoting cell membrane tension and mobility through the Ca2+-LRMDA axis; TRPV2 KO suppresses viral infection and reduces membrane tension; Ca2+-impermeable TRPV2E572Q fails to rescue viral infection in KO cells; LRMDA knockdown phenocopies TRPV2 KO.\",\n      \"method\": \"Conditional TRPV2 KO (LyZ2-Cre;Trpv2fl/fl), TRPV2E572Q reconstitution, LRMDA knockdown, membrane tension measurement, viral infection assays (HSV-1, VSV), in vivo mouse infection model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO, Ca2+-impermeable mutant rescue, downstream effector (LRMDA) identified\",\n      \"pmids\": [\"36261399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Replication stress generates cytosolic ssDNA and dsDNA that activate cGAS, producing cGAMP which binds to STING, causing STING dissociation from TRPV2 and derepression of TRPV2, leading to Ca2+ release from the ER and activation of CaMKK2/AMPK to protect stalled replication forks from Exo1-mediated degradation.\",\n      \"method\": \"TRPV2 KO/knockdown, cGAS/STING epistasis (genetic and pharmacological), Ca2+ imaging, STING-TRPV2 interaction (Co-IP), fork protection assays, Exo1 degradation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis, Co-IP, Ca2+ imaging, and functional fork protection assays establish pathway position\",\n      \"pmids\": [\"36696898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CBD sensitizes TRPV2 responses to 2-APB by over two orders of magnitude; cryo-EM reveals a new small-molecule binding site in the pore domain of rTRPV2 in addition to the known CBD site; strong sensitization is TRPV2/TRPV3-specific and does not originate solely from amino acid differences at the CBD or pore domain sites.\",\n      \"method\": \"Patch-clamp electrophysiology, cryo-EM, mutagenesis at non-conserved positions between rTRPV2 and rTRPV1\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure plus electrophysiology and mutagenesis\",\n      \"pmids\": [\"37199723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRPV2 localizes to the leading edge and nascent adhesions of invasive melanoma cells, regulating Ca2+-mediated calpain activation and talin cleavage, as well as F-actin organization, thereby promoting migration and invasion; TRPV2 silencing in highly metastatic cells prevents aggressive in vitro and in vivo behavior.\",\n      \"method\": \"siRNA knockdown, live imaging of TRPV2 localization (leading edge/adhesions), calpain activity assay, talin cleavage assay, F-actin analysis, in vivo xenograft metastasis assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection via calpain/talin pathway with genetic KD and in vivo validation\",\n      \"pmids\": [\"36744297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPV2 mediates cell swelling (hypotonic stimulation)-induced Ca2+ influx and insulin secretion in mouse pancreatic β-cells; probenecid (TRPV2 activator) elevates [Ca2+]c in β-cells, and TRPV2 siRNA knockdown reduces both hypotonic Ca2+ response and insulin secretion.\",\n      \"method\": \"Fura-2 Ca2+ imaging, siRNA knockdown, ruthenium red/tranilast pharmacology, insulin secretion assay from isolated islets\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA and pharmacology with functional insulin secretion readout\",\n      \"pmids\": [\"30649920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPV2 stimulation suppresses Rac1 and RhoA activation in rheumatoid arthritis fibroblast-like synoviocytes (FLS), reduces integrin localization at the plasma membrane, decreases organized actin filaments, and inhibits FLS invasion; RhoA activators override TRPV2-induced suppression.\",\n      \"method\": \"TRPV2 stimulation assays, Rac1/RhoA activation assays, integrin localization, actin staining, invasion assays, RhoA activator rescue\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — functional pathway dissection with rescue experiment but single study\",\n      \"pmids\": [\"30851707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Phagocytosis in primary human macrophages requires TRPV2-mediated Ca2+ influx, and TRPV2 must be localized to lipid rafts to be functional; P. aeruginosa recruits TRPV2 to the cell surface; cystic fibrosis macrophages have deficient TRPV2 function contributing to impaired phagocytosis.\",\n      \"method\": \"Ca2+ imaging, lipid raft fractionation, TRPV2 surface recruitment assay, phagocytosis assays, siRNA knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — lipid raft fractionation plus functional phagocytosis readout in primary human cells\",\n      \"pmids\": [\"29523858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A selective TRPV2 inhibitor (IV2-1) blocks TRPV2-mediated Ca2+ influx and shapes Ca2+ microdomains at the cell margin in macrophages; TRPV2 inhibition reduces phagocytosis and LPS-induced migration, while TRPV2 activation promotes migration; TRPV2-generated Ca2+ microdomains are important for phagocytosis and migration.\",\n      \"method\": \"Ca2+ influx assay (HEK293 expressing rat TRPV2), patch-clamp, TIRFM Ca2+ microdomain imaging in macrophages, siRNA knockdown, phagocytosis and migration assays\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — selective inhibitor plus siRNA confirmed specificity; TIRFM provides subcellular mechanistic insight\",\n      \"pmids\": [\"37254803\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRPV2 is a heat- (>52°C), mechano-, and lipid-activated Ca2+-permeable nonselective cation channel that resides predominantly in the ER/intracellular membranes under basal conditions and translocates to the plasma membrane upon PI3K/Akt activation by growth factors, lysophospholipids, or mechanical stress; at the membrane it mediates Ca2+ influx that drives diverse downstream processes including macrophage phagocytosis (via PIP2 synthesis and receptor clustering), cardiac mechanotransduction (via IGF-1/PI3K/Akt), insulin secretion (via PI3K-dependent translocation), and cell migration (via calpain/talin/RhoA pathways); channel gating is regulated by PIP2 hydrolysis (desensitization), JAK1-mediated tyrosine phosphorylation (sensitization), cholesterol occupancy of the vanilloid binding pocket (inhibition), and oxidation of M528/M607 (activation); structural studies have defined ligand-binding sites for CBD (S5-S6 hydrophobic pocket), 2-APB (S5/S4-S5 linker interface), cholesterol (vanilloid pocket), and piperlongumine (allosteric pocket), and have revealed symmetry transitions and selectivity filter conformational changes underlying gating.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRPV2 is a Ca²⁺-permeable nonselective cation channel that functions as a polymodal sensor of noxious heat, mechanical force, and lipid signals, translating these stimuli into Ca²⁺ influx to drive macrophage phagocytosis, cardiac mechanotransduction, insulin secretion, thermogenesis, and cell migration. Under basal conditions TRPV2 resides predominantly in intracellular (ER) membranes and translocates to the plasma membrane via PI3K/Akt- and Rac-dependent pathways triggered by growth factors, chemotactic peptides, or mechanical stress [PMID:17154364, PMID:20854263, PMID:25677550]; at the plasma membrane it generates Ca²⁺ microdomains that activate downstream effectors including PIP₂ synthesis for phagocytic receptor clustering, CaMKII in cardiomyocytes, calpain/talin cleavage in migrating cells, and CaMKK2/AMPK during replication stress [PMID:20118928, PMID:23786999, PMID:36744297, PMID:36696898]. Channel gating is regulated by PIP₂ hydrolysis (desensitization), JAK1-mediated tyrosine phosphorylation at Y335/Y471/Y525 (sensitization), cholesterol occupancy of the vanilloid binding pocket (inhibition), and oxidation of M528/M607 (activation), while cryo-EM and crystallographic structures have defined distinct ligand-binding sites for CBD, 2-APB, cholesterol, and piperlongumine and revealed C₂-symmetric intermediates during pore opening [PMID:20926660, PMID:35686730, PMID:36163384, PMID:31719194, PMID:35484159, PMID:31566564]. Conditional cardiac TRPV2 knockout causes rapid intercalated disc disorganization, conduction defects, and impaired IGF-1/PI3K/Akt signaling, while sarcolemmal TRPV2 accumulation drives pathological Ca²⁺ entry in dilated cardiomyopathy and Duchenne muscular dystrophy models [PMID:24874017, PMID:23786999, PMID:25616416].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of TRPV2 (VRL-1) as a high-threshold thermosensor established that a second TRP channel senses noxious heat (>52°C) independently of TRPV1, without capsaicin or proton sensitivity.\",\n      \"evidence\": \"Heterologous expression and patch-clamp electrophysiology with defined thermal stimuli\",\n      \"pmids\": [\"15665528\", \"14622291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous in vivo heat-sensing role later questioned by knockout studies\", \"Species-dependent activation differences not yet recognized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery that 2-APB directly activates TRPV2 provided the first widely used chemical agonist and suggested a shared activation mechanism across TRPV1–3.\",\n      \"evidence\": \"Calcium imaging and electrophysiology in HEK293 cells and Xenopus oocytes\",\n      \"pmids\": [\"15194687\", \"17217057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"2-APB binding site unknown at this time\", \"Mechanism of activation not structurally resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that PI3K-dependent translocation from ER to plasma membrane is required for macrophage Ca²⁺ entry and migration established the regulated trafficking paradigm central to TRPV2 biology.\",\n      \"evidence\": \"GFP-TRPV2 live imaging, patch-clamp, PI3K inhibitor, pertussis toxin, siRNA, and dominant-negative TRPV2 in macrophages\",\n      \"pmids\": [\"17154364\", \"16533525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism coupling PI3K to vesicle insertion not defined\", \"Whether PI3K also modulates channel gating independently of trafficking was debated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"CBD was identified as a potent TRPV2 agonist (EC₅₀ ~3.7 µM), and insulin was shown to drive TRPV2 translocation in β-cells potentiating glucose-stimulated insulin secretion, broadening the channel's physiological ligand and tissue repertoire.\",\n      \"evidence\": \"Ca²⁺ mobilization, siRNA knockdown, CGRP release in DRG neurons; GFP-TRPV2 translocation imaging and shRNA in β-cells with insulin receptor KO\",\n      \"pmids\": [\"18550765\", \"18984736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CBD binding site unknown\", \"Molecular mechanism of insulin-induced translocation not fully resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"TRPV2 was shown to be essential for macrophage phagocytosis through a mechanism linking channel-mediated depolarization to PIP₂ synthesis and phagocytic receptor clustering, with knockout mice exhibiting accelerated mortality to bacterial infection.\",\n      \"evidence\": \"TRPV2 KO macrophages, phagocytosis assays, PIP₂ measurement, live imaging, in vivo Listeria infection model\",\n      \"pmids\": [\"20118928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How depolarization specifically promotes PIP₂ synthesis not fully explained\", \"Relative contribution of TRPV2 vs other channels in innate immunity unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"PIP₂ hydrolysis was identified as the mechanism of Ca²⁺-dependent TRPV2 desensitization, independent of calmodulin, resolving a key question about negative feedback on channel activity.\",\n      \"evidence\": \"Simultaneous confocal PIP₂ probe imaging and patch-clamp electrophysiology with calmodulin inhibitors\",\n      \"pmids\": [\"20926660\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PIP₂ binds directly to TRPV2 or acts indirectly not structurally resolved\", \"Calmodulin C-terminal binding site identified in vitro (PMID:20686800) but functional significance in full-length channel not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Conditional cardiac knockout revealed that TRPV2 is essential for maintaining intercalated disc integrity, conduction, and Ca²⁺ handling through IGF-1/PI3K/Akt signaling, establishing its non-redundant role in cardiac mechanotransduction.\",\n      \"evidence\": \"Cardiac-specific inducible TRPV2 KO mice with echocardiography, single-myocyte Ca²⁺ imaging, and IGF-1 rescue\",\n      \"pmids\": [\"24874017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanosensing mechanism in cardiomyocytes not defined\", \"Whether TRPV2 functions as a primary mechanosensor or secondary effector unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"First cryo-EM structures of TRPV2 (~4–5 Å) revealed the overall architecture including dual pore constrictions and suggested that ankyrin-repeat domain rotation couples to pore opening via the TRP domain, providing the structural foundation for gating models.\",\n      \"evidence\": \"Cryo-EM of full-length rabbit TRPV2 with structural comparison to TRPV1\",\n      \"pmids\": [\"26779611\", \"27021073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Resolution insufficient for atomic detail of ligand binding\", \"No agonist-bound structures at this stage\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"TRPV2 KO mice showed impaired brown adipose thermogenesis and cold intolerance, identifying an unexpected physiological role for the channel in energy metabolism beyond sensory neurons.\",\n      \"evidence\": \"TRPV2 KO mice, β-adrenergic stimulation, thermogenic gene expression, body temperature, Ca²⁺ chelation\",\n      \"pmids\": [\"26882545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking TRPV2 Ca²⁺ to thermogenic gene expression not fully defined\", \"Cell-type specificity of TRPV2 action in BAT not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"High-resolution crystal and cryo-EM structures (3.1–4.0 Å) of RTx-bound and turret-modified TRPV2 revealed that agonist binding induces two-fold symmetric selectivity filter opening permitting large organic cation permeation, and that the pore turret couples lipid binding to upper gate conformation.\",\n      \"evidence\": \"X-ray crystallography and cryo-EM of rabbit and rat TRPV2 with RTx, Ca²⁺, and turret modifications\",\n      \"pmids\": [\"29728656\", \"30598551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of C₂-symmetric intermediate unclear\", \"Full gating cycle not captured\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Sensory neuron-specific TRPV2 KO established the channel as a bona fide mechanical nociceptor for high-threshold stimuli, while its role as an in vivo heat sensor in mammals was not confirmed.\",\n      \"evidence\": \"Conditional KO (Advillin-Cre), behavioral testing (tail-pressure, von Frey, heat), stretch-evoked Ca²⁺ imaging\",\n      \"pmids\": [\"30429536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of mechanosensitivity (direct vs indirect) not resolved\", \"Whether TRPV2 senses membrane stretch directly or through accessory proteins unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"CBD and RTx binding sites were structurally mapped—CBD to a novel S5–S6 inter-subunit pocket and RTx inducing C₂-symmetric intermediates in native lipid—establishing that TRPV2 harbors multiple distinct ligand-binding sites that can drive different conformational pathways.\",\n      \"evidence\": \"Cryo-EM of rat TRPV2 in nanodiscs (apo and CBD-bound), rabbit TRPV2 with RTx in nanodiscs and amphipol; mutagenesis and electrophysiology\",\n      \"pmids\": [\"31566564\", \"31090543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CBD and RTx pathways converge on pore opening not fully integrated\", \"Endogenous lipid ligands occupying these sites not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Oxidation of M528 and M607 was identified as a direct gating mechanism that activates and sensitizes TRPV2 in a temperature-dependent manner, linking ROS signaling to channel function and macrophage phagocytosis.\",\n      \"evidence\": \"Inside-out patch-clamp, M528I/M607I mutagenesis, mass spectrometry, phagocytosis assay with reducing agents\",\n      \"pmids\": [\"31719194\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of oxidation-induced conformational change unknown\", \"Relative contribution of oxidation vs other gating stimuli in vivo not quantified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"High-resolution cryo-EM (2.8–3.3 Å) revealed cholesterol bound in the vanilloid pocket inhibiting TRPV2, and showed estradiol potentiates activation by displacing cholesterol; the 2-APB binding site was mapped to the S5/S4-S5 linker interface, establishing the structural basis for lipid and small-molecule modulation of the vanilloid pocket.\",\n      \"evidence\": \"Cryo-EM with cholesterol, MβCD-treated, estradiol+2-APB, and CBD+2-APB states; mutagenesis of His521 and Arg539; electrophysiology\",\n      \"pmids\": [\"36163384\", \"35484159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cholesterol regulation operates in vivo under physiological conditions not tested\", \"Full integration of all ligand sites into a unified gating model not achieved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"JAK1 was identified as the kinase phosphorylating TRPV2 at Y335/Y471/Y525 to sensitize channel activity, with PTPN1 as the opposing phosphatase, establishing a reversible post-translational regulatory axis critical for macrophage phagocytosis.\",\n      \"evidence\": \"Electrophysiology in macrophages and DRG neurons, mutagenesis, kinase/phosphatase assays, siRNA of JAK1/PTPN1, phagocytosis assay\",\n      \"pmids\": [\"35686730\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling events upstream of JAK1 that trigger TRPV2 phosphorylation not defined\", \"Whether other kinases contribute in different cell types unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A cGAS–STING–TRPV2 axis was discovered in which replication stress activates cGAS/STING, causing STING dissociation from TRPV2 at the ER, derepressing TRPV2-mediated Ca²⁺ release that activates CaMKK2/AMPK to protect stalled replication forks from Exo1 degradation.\",\n      \"evidence\": \"TRPV2 KO/KD, cGAS/STING epistasis, Co-IP of STING–TRPV2, Ca²⁺ imaging, fork protection assays\",\n      \"pmids\": [\"36696898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether STING directly gates TRPV2 or acts through an intermediary not clear\", \"Structural basis of STING–TRPV2 interaction unknown\", \"Generalizability beyond the cell lines tested not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"TRPV2 was shown to localize to leading edges and nascent adhesions in invasive melanoma, where it drives Ca²⁺-dependent calpain activation, talin cleavage, and F-actin reorganization to promote migration and metastasis.\",\n      \"evidence\": \"siRNA knockdown, live imaging of TRPV2 localization, calpain/talin cleavage assays, in vivo xenograft metastasis model\",\n      \"pmids\": [\"36744297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPV2 is activated by mechanical cues at the leading edge or by lipid/chemical signals not distinguished\", \"Therapeutic relevance of TRPV2 inhibition in metastasis not clinically validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether TRPV2 is a direct mechanosensor or requires accessory proteins, the identity of endogenous lipid ligands occupying the vanilloid and CBD pockets, a unified structural model integrating all gating stimuli, and the in vivo relevance of TRPV2 as a thermosensor in mammals.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct vs indirect mechanosensitivity remains unresolved\", \"No endogenous lipid ligands confirmed for the CBD or vanilloid pockets\", \"Complete gating cycle with all modulators not structurally captured\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 5, 20, 27, 40]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 20, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 6, 37]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 6, 8, 11, 15, 16, 42]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 29, 35, 42, 43]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 7, 11, 14, 37]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"STING1\",\n      \"JAK1\",\n      \"PTPN1\",\n      \"LRMDA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}