{"gene":"TRPM4","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2006,"finding":"PIP2 counteracts Ca2+ desensitization and rundown of TRPM4 currents, shifts voltage dependence toward negative potentials, and increases Ca2+ sensitivity 100-fold. Neutralization of basic residues in the C-terminal pleckstrin homology (PH) domain accelerated desensitization and attenuated PIP2 effects. PLC-mediated PIP2 breakdown inhibits TRPM4 activity.","method":"Inside-out and whole-cell patch-clamp; site-directed mutagenesis of PH domain residues; pharmacological PIP2 depletion; M1 muscarinic receptor activation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro electrophysiology with mutagenesis of specific residues, multiple orthogonal methods, replicated pharmacologically","pmids":["16424899"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of mouse TRPM4 (with and without ATP) reveals a three-tiered architecture: N-terminal nucleotide-binding domain (NBD) and C-terminal coiled-coil participate in tetrameric assembly; ATP binds at the NBD and inhibits channel activity; filter residue Gln973 is essential for monovalent selectivity; S1-S4 domain and post-S6 TRP domain form the central gating apparatus housing Ca2+- and PtdIns(4,5)P2-binding sites.","method":"Electron cryo-microscopy (cryo-EM) structure determination with and without ATP","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structures with functional validation, two independent structures (±ATP)","pmids":["29211714"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of human TRPM4 bound to Ca2+ and decavanadate reveals four C-terminal cytosolic domains forming an umbrella-like structure with coiled-coil pole and helical ribs spanning MHR regions; two decavanadate-binding sites identified (C-terminal domain and intersubunit MHR interface); a selectivity-filter glutamine is an important determinant of monovalent selectivity.","method":"Electron cryo-microscopy (cryo-EM) structure determination","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — independent high-resolution cryo-EM structure from a second lab, corroborating and extending mouse TRPM4 structure","pmids":["29211723"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structure of full-length human TRPM4 in a closed Na+-bound apo state identifies an upper gate in the selectivity filter and a lower gate at the entrance to the cytoplasmic coiled-coil domain; intramolecular interactions between TRP domain and S4-S5 linker, N-terminal domain, and N/C termini; N-linked glycosylation at one extracellular site; pore-loop disulfide bond; 24 lipid binding sites; five partially hydrated Na+ ions in the conduction pore.","method":"Electron cryo-microscopy (cryo-EM) at 3.7 Å resolution","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic resolution cryo-EM structure with detailed structural analysis, independent third structure","pmids":["29463718"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structures of full-length human TRPM4 in nanodiscs with and without inhibitors NBA and IBA reveal that small molecule inhibitors bind in a pocket formed between the S3, S4, and TRP helices and the S4-S5 linker. Patch-clamp experiments validated this binding site functionally.","method":"Cryo-EM structure determination in native lipid nanodiscs; patch-clamp electrophysiology","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structures with orthogonal functional validation by electrophysiology","pmids":["39828793"],"is_preprint":false},{"year":2012,"finding":"SUR1 and TRPM4 co-assemble to form SUR1-TRPM4 heteromeric channels (NC(Ca-ATP) channels). Co-expression yielded channels with biophysical properties of TRPM4 and pharmacological properties of SUR1. Co-assembly with SUR1 doubled TRPM4 affinity for calmodulin and doubled its sensitivity to intracellular calcium. SUR1-TRPM4 heteromers appear de novo after spinal cord injury.","method":"FRET; co-immunoprecipitation; whole-cell patch-clamp in co-transfected cells; calmodulin binding assay; spinal cord injury rat model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, FRET, and functional electrophysiology in same study; replicated in injury model","pmids":["23255597"],"is_preprint":false},{"year":2017,"finding":"AQP4 physically co-assembles with SUR1-TRPM4 to form a heteromultimeric water/ion channel complex (SUR1-TRPM4-AQP4). The full tripartite complex is required for fast, high-capacity transmembrane water transport driving cell swelling. In a brain edema model, astrocytes newly upregulate SUR1-TRPM4, which co-associates with AQP4, and genetic inactivation of the SUR1-TRPM4-AQP4 complex blocked in vivo astrocyte swelling.","method":"Co-immunoprecipitation; FRET; calcein fluorescence cell-swelling assay in COS-7 cells and primary astrocytes; cold-injury mouse model with diolistic labeling","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, FRET, functional swelling assay) with in vivo genetic validation","pmids":["28906027"],"is_preprint":false},{"year":2007,"finding":"PKC activity enhances TRPM4 activation by increasing its Ca2+ sensitivity in cerebral arterial smooth muscle cells. PKCδ-dependent phosphorylation promotes pressure-induced smooth muscle depolarization and myogenic vasoconstriction. TRPM4 antisense knockdown in cerebral arteries reduced TRPM4-like currents and diminished PKC-induced depolarization and vasoconstriction.","method":"Patch-clamp electrophysiology; antisense oligonucleotide knockdown; phorbol ester (PMA) stimulation; myogenic tone measurement in isolated cerebral arteries","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — antisense knockdown with functional rescue, pharmacological PKC manipulation, electrophysiology, and myogenic tone measurements","pmids":["17293488"],"is_preprint":false},{"year":2020,"finding":"TRPM4 physically couples to NMDA receptors via intracellular domains located in the near-membrane portions of the receptors. This interaction is required for NMDAR-mediated excitotoxicity; disrupting the NMDAR/TRPM4 complex eliminates toxicity without affecting NMDAR-induced Ca2+ signals. Structure-based computational drug screening using the TRPM4-NMDAR interaction interface identified small molecules that disrupt this complex and reduce neuronal loss in mouse models of stroke and retinal degeneration.","method":"Co-immunoprecipitation; structure-based computational drug screening; neuronal loss assays in mouse stroke and retinal degeneration models; Ca2+ imaging","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — physical interaction validated by co-IP, functional disruption with small molecules, replicated in multiple in vivo disease models","pmids":["33033186"],"is_preprint":false},{"year":2011,"finding":"PKCδ activity maintains TRPM4 channel protein at the plasma membrane of cerebral artery smooth muscle cells. siRNA-mediated downregulation or pharmacological inhibition of PKCδ causes TRPM4 to move from plasma membrane into the cytosol and diminishes TRPM4-dependent currents.","method":"siRNA knockdown of PKCδ; pharmacological PKCδ inhibition (rottlerin); immunolabeling; perforated-patch electrophysiology","journal":"Channels (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal approaches (genetic and pharmacological) in same lab, single study","pmids":["21406958"],"is_preprint":false},{"year":2006,"finding":"TRPM4 controls membrane potential and electrical activity in insulin-secreting INS-1 beta-cells by generating large depolarizing currents in response to increased intracellular Ca2+. A dominant-negative TRPM4 construct significantly decreased insulin secretion in response to glucose and vasopressin. TRPM4-containing vesicles are recruited to the plasma membrane during Ca2+-dependent exocytosis.","method":"Patch-clamp electrophysiology; dominant-negative TRPM4 construct; insulin secretion assay; capacitance measurements; FM1-43 dye; confocal imaging","journal":"Cell calcium","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative functional knockdown with multiple orthogonal readouts (secretion, capacitance, vesicle imaging)","pmids":["16806463"],"is_preprint":false},{"year":2008,"finding":"TRPM4 controls migration of bone marrow-derived mast cells (BMMCs). TRPM4 knockout BMMCs fail to migrate in response to DNP-HSA or SCF. TRPM4 regulates Ca2+-dependent F-actin rearrangements required for cell migration.","method":"TRPM4 knockout mice; migration assays; cytochalasin B inhibition; phalloidin immunofluorescence for F-actin","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model with functional assay and mechanistic link to F-actin, single lab","pmids":["19046767"],"is_preprint":false},{"year":2009,"finding":"De novo upregulation of TRPM4 in spinal cord capillaries renders cells susceptible to oncotic swelling and death upon ATP depletion. In vivo, Trpm4 antisense treatment or Trpm4-/- mice prevented secondary hemorrhage, capillary fragmentation, and reduced lesion volume after spinal cord injury.","method":"Rodent spinal cord injury models; antisense knockdown in rats; Trpm4-/- mice; cell swelling assays in COS-7 cells expressing TRPM4; histology","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent genetic suppression approaches (antisense + KO), in vitro mechanistic validation, published in high-impact journal","pmids":["19169264"],"is_preprint":false},{"year":2010,"finding":"TRPM4 is expressed at higher levels in Th2 versus Th1 cells and differentially regulates Ca2+ influx and NFATc1 nuclear localization. Inhibition of TRPM4 expression increased Ca2+ influx in Th2 cells and decreased it in Th1 cells, altering cytokine production and T cell motility.","method":"siRNA knockdown; Ca2+ imaging; nuclear localization assays; cytokine measurements; motility assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with multiple functional readouts, single lab","pmids":["20656926"],"is_preprint":false},{"year":2012,"finding":"TRPM4 deficiency or pharmacological inhibition reduces axonal and neuronal degeneration in EAE without altering immune function. TRPM4 mediates Na+ influx and oncotic cell swelling upon excitotoxic stimulation in neurons.","method":"Trpm4-/- mice; EAE model; glibenclamide pharmacological inhibition; electrophysiological recordings of ion influx; cell swelling measurements in vitro","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO and pharmacological inhibition converging on same phenotype, mechanistic electrophysiology included","pmids":["23160238"],"is_preprint":false},{"year":2014,"finding":"N-linked glycosylation of TRPM4 occurs at a unique residue Asn992. Abolishing glycosylation by N992Q mutation or tunicamycin treatment differentially affects current density but does not alter channel trafficking to the plasma membrane, indicating glycosylation mainly regulates TRPM4 function rather than surface expression.","method":"Site-directed mutagenesis (N992Q); tunicamycin treatment; Western blot; patch-clamp electrophysiology; surface biotinylation","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus pharmacological glycosylation inhibition with electrophysiology, single lab, somewhat contradictory results between mutation and drug treatment","pmids":["24605085"],"is_preprint":false},{"year":2015,"finding":"PIP2 and PIP3 interact with the E733-W772 proximal N-terminal region of TRPM4. Residues R755 and R767 are important for PIP2/PIP3 binding; their mutation caused partial loss of binding specificity.","method":"Biophysical binding assays; molecular modeling; mutagenesis of R755 and R767","journal":"Biophysical chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro binding assay with mutagenesis, but single lab and limited functional electrophysiological validation","pmids":["26071843"],"is_preprint":false},{"year":2019,"finding":"TRPM4 interacts with end-binding (EB) proteins EB1 and EB2 via a putative motif in TRPM4. Mutations abolishing this interaction reduce mature plasma membrane TRPM4 and result in ER-associated distribution. EB1/EB2 are required for TRPM4 anterograde trafficking and functional activity, which in turn regulate focal adhesion disassembly and cell invasion.","method":"Co-immunoprecipitation; mutagenesis of EB binding motif; subcellular localization imaging; dominant-negative EB binding fragment; focal adhesion assays; invasion assays","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus mutagenesis plus functional readouts, single lab","pmids":["31112396"],"is_preprint":false},{"year":2013,"finding":"TRPM4 is activated by Ca2+-induced Ca2+ release in mouse ventricular myocytes and its loss in Trpm4-/- mice leads to increased β-adrenergic inotropic response, shortened action potential duration at 50% and 90% repolarization, and increased driving force for L-type Ca2+ current.","method":"Trpm4-/- mice; patch-clamp; membrane potential measurements; microfluorometry; contractility measurements; in vivo pressure-volume loop analysis","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with multiple orthogonal in vitro and in vivo functional readouts","pmids":["24226423"],"is_preprint":false},{"year":2016,"finding":"In TLR4-activated microglia, Sur1-Trpm4 channels regulate Ca2+ influx to control NFAT nuclear translocation and downstream NOS2 transcription. Inhibiting or silencing Sur1 or Trpm4 increased [Ca2+]i but paradoxically decreased NFAT nuclear translocation via phosphorylation of CaMKII and calcineurin.","method":"In vivo and in vitro microglia; LPS activation; patch-clamp; calcium imaging; chromatin immunoprecipitation; co-immunoprecipitation; immunohistochemistry; qPCR; Griess assay; Trpm4-/- and Abcc8-/- mice","journal":"Journal of neuroinflammation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including ChIP, co-IP, electrophysiology, KO mice, and genetic silencing in same study","pmids":["27246103"],"is_preprint":false},{"year":2021,"finding":"NO/cGMP/PKG signaling causes vasodilation by inhibiting TRPM4 channel activity in cerebral artery smooth muscle cells. PKG phosphorylates IRAG, which then inhibits IP3R-mediated Ca2+ release from the SR, thereby reducing Ca2+-dependent TRPM4 activation. IRAG, PKG, and IP3Rs form a nanoscale signaling complex on the SR. IRAG knockdown diminished NO-mediated TRPM4 inhibition and vasodilation.","method":"Electrophysiology; Ca2+ imaging; pharmacological inhibition of sGC and PKG; siRNA knockdown of IRAG; superresolution microscopy; isolated cerebral artery myogenic response measurements","journal":"Function (Oxford, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockdown with pharmacological validation, multiple methods including superresolution microscopy, functional vascular readouts","pmids":["34734188"],"is_preprint":false},{"year":2023,"finding":"Na+ influx through SUR1-TRPM4 in perivascular astrocyte endfeet drives Ca2+ entry through NCX1 operating in reverse mode, raising intra-endfoot Ca2+ which stimulates calmodulin-dependent AQP4 translocation to the plasma membrane, causing water influx and brain swelling after ischemic stroke.","method":"Mouse ischemic stroke model; pharmacological inhibition of SUR1-TRPM4 and NCX1; astrocyte-specific gene deletion; Ca2+ imaging; AQP4 surface localization assays","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific genetic deletion plus pharmacological inhibition plus Ca2+ imaging establishing molecular mechanism chain","pmids":["37279286"],"is_preprint":false},{"year":2018,"finding":"TRPM4 gain-of-function mutations (p.Ile1033Met and p.Ile1040Thr) in the S6 transmembrane domain, corresponding to the activation gate per cryo-EM structures, cause autosomal dominant progressive symmetric erythrokeratodermia. Mutant channels show pronounced baseline activity, enhanced Ca2+ sensitivity, and elevated resting membrane potential, and enhance keratinocyte proliferation.","method":"Genetic sequencing; cryo-EM structural analysis; patch-clamp electrophysiology of mutants; keratinocyte proliferation assays","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structure-informed mutagenesis with electrophysiology and cellular phenotype, multiple families","pmids":["30528822"],"is_preprint":false},{"year":2016,"finding":"The TRPM4 variant p.I376T causes gain of surface expression and increased current density in HEK293 cells, establishing a gain-of-expression/function mechanism for progressive familial heart block type I.","method":"Whole-cell patch-clamp; Western blot; surface expression analysis in HEK293 cells","journal":"International journal of cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus biochemical surface expression in same study, single lab","pmids":["26820365"],"is_preprint":false},{"year":2011,"finding":"TRPM4 silencing promotes GSK-3β-dependent degradation of β-catenin and reduces β-catenin/Tcf/Lef transcriptional activity, decreasing HeLa cell proliferation. TRPM4 overexpression increases cell proliferation and β-catenin levels. TRPM4 functions as a regulator of the β-catenin signaling pathway.","method":"siRNA knockdown; TRPM4 overexpression; Western blot for β-catenin phosphorylation; Tcf/Lef reporter assay; proliferation assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function approaches converging on β-catenin pathway, single lab","pmids":["20625999"],"is_preprint":false},{"year":2017,"finding":"TRPM4 silencing in PC3 prostate cancer cells decreases Akt1 phosphorylation, increases GSK-3β activity, and promotes β-catenin degradation, reducing nuclear β-catenin and Tcf/Lef transcription. The effect on Akt1 is mediated through the calcium/calmodulin-EGFR axis.","method":"siRNA knockdown; TRPM4 overexpression; Western blot for phosphorylated GSK-3β, β-catenin, Akt; Tcf/Lef reporter assay","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — convergent loss- and gain-of-function, multiple pathway readouts, single lab","pmids":["28614631"],"is_preprint":false},{"year":2018,"finding":"TRPM4 knockdown in PC3 prostate cancer cells reduces Snail1 expression and causes partial reversion of EMT (altered MMP9, E-cadherin/N-cadherin, vimentin), decreasing migration and invasion. TRPM4 overexpression in LNCaP cells increases Snail1, reduces E-cadherin, and increases migration.","method":"shRNA knockdown; TRPM4 overexpression; Western blot for EMT markers; migration/invasion assays","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with multiple molecular readouts, single lab","pmids":["30343491"],"is_preprint":false},{"year":2015,"finding":"TRPM4 currents in primary cilia of renal mIMCD-3 cells have EC50 ~646 µM for Ca2+ at +100 mV, are inhibited by MgATP and 9-phenanthrol, are not permeable to Ca2+ or Cl-, and are modulated by PIP2. shRNA reduction of Trpm4 shortened primary cilia by 43%.","method":"Direct patch-clamp recording from excised primary cilia; shRNA knockdown; pharmacological characterization","journal":"American journal of physiology. Renal physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiology from native cilia, genetic knockdown with structural phenotype, single lab","pmids":["26290373"],"is_preprint":false},{"year":2016,"finding":"U73122 (PLC inhibitor) is a potent agonist of TRPM4 channels that acts through covalent modification, independently of PLC, PIP2 depletion, and Ca2+. It activates endogenous TRPM4 in CHO, Jurkat, and HEK293T cells and recombinant human TRPM4. TRPM5 was insensitive to U73122, showing selectivity within the TRPM family.","method":"Whole-cell patch-clamp; pharmacological characterization; comparison of TRPM4, TRPM3, TRPM5 responses","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology in multiple cell types with endogenous and recombinant channels, single lab","pmids":["27328745"],"is_preprint":false},{"year":2018,"finding":"TRPM4 is present in TRPM4 is expressed in medial prefrontal cortex layer 2/3 pyramidal neurons and interneurons, localizing to soma and proximal dendrites but not the axon initial segment. A 9-phenanthrol-sensitive TRPM4-like current is active at resting membrane potential, and local somatic perfusion of 9-phenanthrol reduces basal current.","method":"Multiplex immunofluorescence; perforated patch-clamp; local superfusion experiments","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — localization and electrophysiology combined with local pharmacology, single lab","pmids":["29440991"],"is_preprint":false},{"year":2021,"finding":"TRPM4 in pancreatic acinar cells mediates Ca2+-dependent membrane depolarization (from -44.4 to -27.7 mV), which reduces the inward driving force for Ca2+ entry. TRPM4 KO or pharmacological inhibition (CBA) increases Ca2+ influx and augments Ca2+ oscillation amplitude induced by cerulein, identifying TRPM4 as a negative feedback regulator of Ca2+ entry.","method":"Trpm4-/- mice; patch-clamp (whole-cell and perforated); CBA pharmacological inhibition; Ca2+ imaging; cerulein stimulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse and pharmacological inhibition converging on same functional phenotype with mechanistic Ca2+ measurements","pmids":["34329682"],"is_preprint":false},{"year":2022,"finding":"TRPM4 mediates a Ca2+ overload-induced background current in ventricular cardiomyocytes. Trpm4-/- mice and meclofenamate (identified as a potent TRPM4 antagonist) both reduced Ca2+-dependent triggered arrhythmias in two proarrhythmic mouse models, establishing TRPM4 as a contributor to triggered cardiac arrhythmias.","method":"Trpm4-/- mice; compound screening; in vitro electrophysiology; in vivo intracardiac and telemetric ECG; meclofenamate pharmacology","journal":"European heart journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO and pharmacological inhibition converging on in vivo arrhythmia phenotype","pmids":["35822895"],"is_preprint":false},{"year":2021,"finding":"Selective deletion of TRPM4 in mouse cardiomyocytes reduces pressure overload-induced left ventricular hypertrophy by ~50%, identifying TRPM4 as a component of the mechanosensory signaling pathway that induces LVH in response to pressure overload.","method":"Cardiomyocyte-specific Trpm4 conditional KO mice; transverse aortic constriction model; cardiac morphology and function measurements","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO with quantitative phenotypic readout in a well-established disease model","pmids":["34190686"],"is_preprint":false},{"year":2023,"finding":"Piezo1 and TRPM4 are functionally coupled in HL-1 atrial myocyte-like cells: Yoda1-induced Piezo1 activation alters action potential frequency, and this effect is significantly reduced by TRPM4 knockdown or pharmacological inhibition.","method":"siRNA knockdown of Piezo1 and TRPM4; 9-phenanthrol pharmacology; FluoVolt voltage imaging; Yoda1 agonist stimulation","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — convergent genetic and pharmacological approaches, but in cell line model, single lab","pmids":["38098265"],"is_preprint":false},{"year":2023,"finding":"TRPM4 plays a pivotal role in necrosis-inducing cancer therapy (ErSO/BHPI). CRISPR screen identified TRPM4 as essential for necrotic cell death; TRPM4 KO abolished ErSO-induced tumor regression in mice. Mechanistically, ErSO activates unfolded protein response (a-UPR), and TRPM4-mediated Na+ influx and cell swelling sustain and propagate lethal a-UPR hyperactivation.","method":"Genome-wide CRISPR-Cas9 screen; TRPM4 KO cells and in vivo tumor models; cell volume measurement; ATP depletion assay; macrophage activation assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide unbiased screen confirmed by KO with multiple orthogonal in vitro and in vivo readouts","pmids":["37522838"],"is_preprint":false},{"year":2025,"finding":"TRPM4 persistent activation by the small molecule NC1 causes necrosis via sodium overload (NECSO). NC1 specifically activates human TRPM4 but not mouse TRPM4 due to differences in a transmembrane region identified by domain swapping and molecular docking. Gain-of-function cardiac arrhythmia mutations increase NECSO vulnerability. TRPM4-deficient cells are resistant to NC1-induced necrosis.","method":"TRPM4-deficient cells; domain swapping; molecular docking; cell death assays; compound screening for NECSO inhibitors","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mechanistic domain swapping plus molecular docking plus genetic KO plus pharmacological rescue, multiple orthogonal methods","pmids":["39915626"],"is_preprint":false},{"year":2018,"finding":"TRPM4 and TRPM5 are both required for taste transduction in type II taste receptor cells. Loss of either channel significantly impairs taste detection; loss of both abolishes detection of bitter, sweet, or umami stimuli. TRPM4 functions as a downstream component in these taste signaling pathways.","method":"TRPM4 KO and TRPM5 KO mice; double KO mice; live cell Ca2+ imaging; behavioral taste assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — single and double KO mouse models with convergent in vitro and behavioral readouts","pmids":["29311301"],"is_preprint":false},{"year":2018,"finding":"TRPM4 and NCX2 functionally cooperate to control Ca2+-mediated MUC2 and MUC5AC mucin secretion. Blocking TRPM4 or NCX activity abrogated mucin secretion in colonic, bronchial, and cystic fibrosis tracheal cells. TRPM4 and NCXs are both required for regulated mucin secretion.","method":"TRPM4 and NCX pharmacological inhibition; mucin secretion assays in HT29-18N2, NHBE, and CFT1-LC3 cells; Western blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with functional secretion readout in multiple cell types, single lab","pmids":["30482841"],"is_preprint":false},{"year":2020,"finding":"TRPM4 currents in ventricular fibroblasts from heart failure patients are more than 2-fold larger than controls. TGFβ1 treatment of control fibroblasts increases TRPM4 current within 24 hours, suggesting TGFβ1 upregulates TRPM4 expression and links TRPM4 to cardiac fibrogenesis.","method":"Patch-clamp electrophysiology of primary human fibroblasts; Western blot; TGFβ1 stimulation","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional electrophysiology in primary human cells with pharmacological manipulation, single lab","pmids":["33594499"],"is_preprint":false},{"year":2022,"finding":"p53 and p63γ repress TRPM4 promoter activity. Loss of p53 increases TRPM4 mRNA, protein, and Na+ currents in colorectal cancer cells. Transient p53 overexpression decreases TRPM4-mediated currents. TRPM4 KO mimics the effect of p53 on store-operated Ca2+ entry and cell cycle distribution.","method":"CRISPR-Cas9 KO; p53/p63γ overexpression; promoter-reporter assays; patch-clamp; Ca2+ imaging; cell cycle analysis","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic approaches with functional electrophysiology and Ca2+ readouts, single lab","pmids":["35500522"],"is_preprint":false},{"year":2022,"finding":"In colorectal cancer cells, TRPM4 overexpression enhances Ca2+ influx to activate calpain-mediated proteolysis of FAK, and suppresses PI3K/Akt/mTOR signaling, reducing migration and invasion. Calpain inhibition relieves FAK suppression and reverses the migration inhibitory effect, placing TRPM4 upstream of Ca2+/calpain/FAK axis.","method":"TRPM4 overexpression; calpain inhibition; Western blot for FAK, Akt, PI3K, mTOR; migration assays; in vivo tumor model","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by calpain inhibition rescue, multiple pathway readouts, single lab","pmids":["36147460"],"is_preprint":false},{"year":2019,"finding":"TRPM4 in NF-κB-activated brain endothelial cells is opened by tPA in a plasmin-, PAR1-, TRPC3-, and Ca2+-dependent manner, and this SUR1-TRPM4 channel activity is required for tPA-induced phasic (but not tonic) MMP-9 secretion.","method":"NF-κB activation of brain endothelial cells; patch-clamp electrophysiology; ELISA and zymography for MMP-9; genetic and pharmacological inhibition of SUR1-TRPM4 and TRPC3; Ca2+ imaging","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus secretion assay with genetic and pharmacological manipulation, single lab","pmids":["29617457"],"is_preprint":false},{"year":2016,"finding":"Heterologously expressed TRPM4 assembles as a functional tetramer. Purified TRPM4-eGFP in detergent micelles was found to be tetrameric by crosslinking, native gel electrophoresis, multi-angle laser light scattering, and electron microscopy. Liposome-reconstituted TRPM4-eGFP exhibited single-channel activity inhibitable by flufenamic acid.","method":"Protein purification; crosslinking; native PAGE; multi-angle laser light scattering; electron microscopy; single-channel electrophysiology of proteoliposomes","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biochemical/biophysical methods to establish tetrameric architecture plus reconstituted functional activity","pmids":["26785754"],"is_preprint":false},{"year":2023,"finding":"TRPM4 and TRPV4 functionally couple in human trabecular meshwork (TM) cells: TRPV4 agonist (GSK1016790A) activates TRPM4-mediated monovalent cation current and Ca2+ oscillations. TRPM4 silencing antagonized TRPV4-evoked oscillatory signaling; co-expression of TRPV4 and TRPM4 in HEK-293 cells reconstituted oscillations.","method":"siRNA knockdown; electrophysiology; Ca2+ imaging; heterologous co-expression in HEK-293 cells; immunofluorescence","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional coupling shown by KD and heterologous reconstitution, single lab","pmids":["35432302"],"is_preprint":false},{"year":2023,"finding":"Age-dependent deficiency of TRPM4 currents in cerebral artery smooth muscle cells from Col4a1 mutant mice (Gould syndrome model) underlies impaired vascular myogenic response. Excess PI3K activity consumes PIP2 (required for TRPM4 activity). Dialyzing cells with PIP2 or inhibiting PI3K restored TRPM4 currents and rescued myogenic response. TGF-β signaling drives PI3K hyperactivity to deplete PIP2.","method":"Patch-clamp of native SMCs from Col4a1 mutant mice; PIP2 dialysis; PI3K inhibitors; TGF-β receptor inhibition; myogenic response measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple pharmacological and biochemical interventions converging on a defined signaling mechanism, functional vascular readout","pmids":["36693102"],"is_preprint":false},{"year":2020,"finding":"TRPM4 contributes to plateau potentials and persistent firing in thalamic reticular nucleus neurons, driven by Ca2+ influx through T-type Ca2+ channels. Pharmacological blockade of TRPM4 reduced plateau potentials and slow oscillatory activity.","method":"Thalamic slice electrophysiology; pharmacological inhibition of TRPM4; T-type Ca2+ channel blockers; recording in adult mice","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology with pharmacological intervention establishing mechanism, single lab","pmids":["32414784"],"is_preprint":false},{"year":2018,"finding":"TRPM4 channels contribute to respiratory motor pattern formation (amplitude of inspiratory motoneuronal activity) but not rhythmogenesis in pre-Bötzinger complex inspiratory neurons. TRPM4 mRNA is expressed in these neurons. Pharmacological TRPM4 inhibition reduced inspiratory burst amplitude without altering frequency in both in vitro slices and in situ preparations.","method":"Single-cell multiplex RT-PCR; TRPM4 pharmacological inhibition; in vitro medullary slice recordings; in situ brainstem-spinal cord preparation recordings; calcium imaging","journal":"eNeuro","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mRNA expression combined with pharmacological loss-of-function in two intact preparations, single lab","pmids":["29435486"],"is_preprint":false},{"year":2012,"finding":"TRPM4 ablation dramatically increased mouse mortality in cecal ligation and puncture sepsis due to impaired macrophage Ca2+ mobilization, downregulated AKT signaling, and decreased phagocytic activity, resulting in bacterial overgrowth. Trpm4-/- neutrophils showed no alteration in function or Ca2+ mobilization, demonstrating cell-type-specific Ca2+ regulatory mechanisms.","method":"Trpm4-/- mice; cecal ligation and puncture model; Ca2+ imaging; AKT signaling analysis; phagocytosis assays; bacterial enumeration","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with multiple mechanistic readouts (Ca2+, AKT, phagocytosis) and in vivo infection model","pmids":["22933633"],"is_preprint":false}],"current_model":"TRPM4 is a Ca2+-activated, voltage-dependent, monovalent-selective (Na+/K+) non-selective cation channel that forms functional homotetramers; its gating is positively regulated by PIP2 (acting through C-terminal PH domain and N-terminal basic residues), negatively regulated by ATP (binding to the N-terminal nucleotide-binding domain), potentiated by PKC (which also promotes its plasma membrane localization via PKCδ), inhibited by the NO/cGMP/PKG/IRAG pathway, and its surface trafficking depends on EB1/EB2 microtubule-plus-end proteins; structurally it has an upper selectivity-filter gate and lower coiled-coil gate, with inhibitor-binding pocket between S3/S4/TRP helices and S4-S5 linker; it co-assembles with SUR1 (doubling Ca2+ and calmodulin sensitivity) and further with AQP4 to form a tripartite channel complex that drives oncotic cell swelling and brain edema; it physically couples to NMDA receptors to mediate excitotoxic neuronal death; and it depolarizes the plasma membrane to modulate voltage-gated Ca2+ channel activity and Ca2+ homeostasis in diverse cell types including cardiac myocytes, vascular smooth muscle, pancreatic beta-cells, mast cells, T cells, and neurons—with gain-of-function mutations causing cardiac arrhythmias and skin channelopathies, and sustained activation mediating sodium-overload necrosis."},"narrative":{"mechanistic_narrative":"TRPM4 is a Ca2+-activated, voltage-modulated, monovalent-selective (Na+/K+) non-selective cation channel that assembles as a homotetramer and converts intracellular Ca2+ signals into membrane depolarization across diverse excitable and non-excitable cell types [PMID:26785754, PMID:16806463]. Cryo-EM structures define a three-tiered architecture in which an N-terminal nucleotide-binding domain binds inhibitory ATP, C-terminal coiled-coil and MHR regions mediate tetrameric assembly, and the S1-S4/TRP gating module houses Ca2+- and PtdIns(4,5)P2-binding sites controlling an upper selectivity-filter gate and a lower cytoplasmic gate, with a filter glutamine (Gln973) dictating monovalent selectivity [PMID:29211714, PMID:29211723, PMID:29463718]. Gating is tuned by phospholipid and kinase inputs: PIP2 binding to C-terminal PH-domain basic residues and a proximal N-terminal region counteracts desensitization and raises Ca2+ sensitivity, PKCδ phosphorylation increases Ca2+ sensitivity and maintains surface expression, and NO/cGMP/PKG signaling inhibits the channel via IRAG-dependent suppression of IP3R Ca2+ release [PMID:16424899, PMID:26071843, PMID:17293488, PMID:21406958, PMID:34734188]. Small-molecule inhibitors bind a pocket between the S3, S4, and TRP helices and the S4-S5 linker [PMID:39828793], and anterograde trafficking to the plasma membrane depends on EB1/EB2 microtubule-plus-end proteins [PMID:31112396]. Physiologically, TRPM4-mediated depolarization modulates voltage-gated Ca2+ entry and electrical activity in cerebral arterial smooth muscle myogenic tone, cardiac myocytes, pancreatic beta- and acinar cells, taste receptor cells, and central neurons [PMID:17293488, PMID:24226423, PMID:16806463, PMID:34329682, PMID:29311301, PMID:32414784], and it controls Ca2+-dependent processes including insulin and mucin secretion, mast cell and macrophage function, and T cell NFAT signaling [PMID:16806463, PMID:30482841, PMID:19046767, PMID:22933633, PMID:20656926]. TRPM4 co-assembles with SUR1 to form NC(Ca-ATP) channels with doubled calmodulin and Ca2+ sensitivity, and further with AQP4 into a tripartite complex that drives oncotic astrocyte swelling and brain edema after injury, with Na+ influx coupling through reverse-mode NCX1 to trigger AQP4 translocation [PMID:23255597, PMID:28906027, PMID:37279286]. TRPM4 physically couples to NMDA receptors to mediate excitotoxic neuronal death independently of NMDAR Ca2+ signals [PMID:33033186], and sustained Na+ overload through TRPM4 executes oncotic necrosis exploited in necrosis-inducing cancer therapy [PMID:19169264, PMID:37522838, PMID:39915626]. Gain-of-function S6 mutations cause autosomal dominant progressive symmetric erythrokeratodermia, and gain-of-expression variants cause progressive familial heart block, while TRPM4 contributes to triggered cardiac arrhythmias and pressure-overload hypertrophy [PMID:30528822, PMID:26820365, PMID:35822895, PMID:34190686].","teleology":[{"year":2006,"claim":"Established how a lipid signal sets TRPM4 sensitivity, explaining why receptor-driven PIP2 hydrolysis dampens the channel and resolving the basis of Ca2+ desensitization.","evidence":"Inside-out and whole-cell patch-clamp with PH-domain mutagenesis and pharmacological/M1-receptor PIP2 depletion","pmids":["16424899"],"confidence":"High","gaps":["Did not resolve the structural location of the PIP2 site","Functional interplay between PIP2 and ATP regulation not addressed"]},{"year":2006,"claim":"Defined a core physiological role: TRPM4 generates Ca2+-triggered depolarizing current that gates electrical activity and hormone secretion in beta-cells.","evidence":"Patch-clamp, dominant-negative TRPM4, capacitance and insulin secretion assays, vesicle imaging in INS-1 cells","pmids":["16806463"],"confidence":"High","gaps":["Dominant-negative effects not validated against genetic knockout","Mechanism of TRPM4 vesicular recruitment unresolved"]},{"year":2007,"claim":"Linked TRPM4 to vascular tone by showing PKC phosphorylation potentiates the channel to drive myogenic vasoconstriction.","evidence":"Patch-clamp, antisense knockdown, PMA stimulation, and myogenic tone measurement in cerebral arteries","pmids":["17293488"],"confidence":"High","gaps":["Specific phosphorylation residues not mapped","PKC isoform identity not yet pinned down in this study"]},{"year":2009,"claim":"Identified TRPM4 as the effector of oncotic capillary death after CNS injury, establishing it as a therapeutic target for secondary hemorrhage.","evidence":"Spinal cord injury models with antisense and Trpm4-/- mice plus in vitro swelling assays","pmids":["19169264"],"confidence":"High","gaps":["Did not define the molecular partners enabling water flux","Trigger for de novo upregulation not identified here"]},{"year":2011,"claim":"Showed PKCδ maintains TRPM4 at the plasma membrane, separating a trafficking control from gating regulation.","evidence":"siRNA and pharmacological PKCδ inhibition with immunolabeling and perforated-patch recording in cerebral artery SMCs","pmids":["21406958"],"confidence":"Medium","gaps":["Single lab, single cell type","Direct phosphorylation of TRPM4 by PKCδ not demonstrated"]},{"year":2012,"claim":"Connected TRPM4 to proliferative β-catenin signaling, indicating a non-electrical role in cell growth.","evidence":"siRNA knockdown, overexpression, β-catenin phosphorylation Western blot, Tcf/Lef reporter in HeLa cells","pmids":["20625999"],"confidence":"Medium","gaps":["Mechanism linking channel activity to GSK-3β not defined","Single cell line"]},{"year":2012,"claim":"Revealed cell-type-specific immune roles, with TRPM4 required for macrophage Ca2+ mobilization and host defense in sepsis.","evidence":"Trpm4-/- mice in cecal ligation/puncture with Ca2+ imaging, AKT analysis, and phagocytosis assays","pmids":["22933633"],"confidence":"High","gaps":["Mechanism coupling TRPM4 to AKT not resolved","Why neutrophils are unaffected not explained"]},{"year":2012,"claim":"Defined the SUR1-TRPM4 heteromeric channel and showed SUR1 doubles calmodulin and Ca2+ sensitivity, explaining injury-induced NC(Ca-ATP) currents.","evidence":"FRET, reciprocal co-IP, patch-clamp in co-transfected cells, calmodulin binding assay, spinal cord injury model","pmids":["23255597"],"confidence":"High","gaps":["Stoichiometry of the SUR1-TRPM4 assembly not defined","Structural basis of sensitivity enhancement unknown"]},{"year":2013,"claim":"Established a cardiac role: TRPM4 shapes ventricular repolarization and β-adrenergic inotropy via Ca2+-induced Ca2+ release.","evidence":"Trpm4-/- mice with patch-clamp, contractility, and in vivo pressure-volume analysis","pmids":["24226423"],"confidence":"High","gaps":["Subcellular localization in myocytes not mapped","Coupling to specific Ca2+ release sites not defined"]},{"year":2010,"claim":"Showed TRPM4 differentially sets Ca2+ influx and NFATc1 signaling between Th1 and Th2 cells, tuning adaptive immune output.","evidence":"siRNA knockdown, Ca2+ imaging, NFATc1 nuclear localization, cytokine and motility assays","pmids":["20656926"],"confidence":"Medium","gaps":["Mechanism of opposite effects in Th1 vs Th2 unexplained","siRNA-only, single lab"]},{"year":2014,"claim":"Mapped a single N-glycosylation site (Asn992) and showed it regulates function rather than surface trafficking.","evidence":"N992Q mutagenesis, tunicamycin, Western blot, patch-clamp, surface biotinylation","pmids":["24605085"],"confidence":"Medium","gaps":["Mutation and drug results were partly discordant","Functional consequence mechanistically unresolved"]},{"year":2015,"claim":"Localized a proximal N-terminal phosphoinositide-binding region (E733-W772, R755/R767), complementing the C-terminal PIP2 determinants.","evidence":"Biophysical binding assays, molecular modeling, mutagenesis","pmids":["26071843"],"confidence":"Medium","gaps":["Limited functional electrophysiological validation","Selectivity between PIP2 and PIP3 not fully resolved"]},{"year":2015,"claim":"Demonstrated native TRPM4 currents in primary cilia and a structural role in cilium length, extending the channel to ciliary signaling.","evidence":"Direct patch-clamp from excised cilia, shRNA knockdown, pharmacology in mIMCD-3 cells","pmids":["26290373"],"confidence":"Medium","gaps":["Mechanism linking TRPM4 to cilium length unknown","Single lab"]},{"year":2016,"claim":"Confirmed TRPM4 forms a functional homotetramer sufficient for channel activity by reconstitution.","evidence":"Purification, crosslinking, native PAGE, MALLS, EM, and single-channel recording of proteoliposomes","pmids":["26785754"],"confidence":"High","gaps":["Did not resolve atomic architecture","Regulatory subunit requirements in vivo not addressed"]},{"year":2016,"claim":"Showed SUR1-TRPM4 paradoxically controls NFAT-driven NOS2 transcription in activated microglia through Ca2+-dependent CaMKII/calcineurin signaling.","evidence":"ChIP, co-IP, patch-clamp, Ca2+ imaging, Trpm4-/- and Abcc8-/- mice with LPS activation","pmids":["27246103"],"confidence":"High","gaps":["Mechanism of the paradoxical Ca2+/NFAT relationship incompletely defined"]},{"year":2016,"claim":"Extended TRPM4 cancer signaling to a Ca2+/calmodulin-EGFR-Akt-GSK-3β-β-catenin axis controlling prostate cancer proliferation.","evidence":"siRNA, overexpression, phospho-Western blots, Tcf/Lef reporter in PC3 cells","pmids":["28614631"],"confidence":"Medium","gaps":["Direct linkage of channel ion flux to Akt unproven","Single lab"]},{"year":2016,"claim":"Identified the first cardiac gain-of-expression mechanism for a disease variant (p.I376T) in progressive familial heart block type I.","evidence":"Whole-cell patch-clamp, Western blot, surface expression in HEK293","pmids":["26820365"],"confidence":"Medium","gaps":["In vivo conduction phenotype not modeled","Heterologous-only system"]},{"year":2016,"claim":"Characterized U73122 as a covalent, PLC-independent TRPM4 agonist selective within the TRPM family, refining pharmacology.","evidence":"Whole-cell patch-clamp across CHO, Jurkat, HEK293T, and recombinant TRPM4 vs TRPM5","pmids":["27328745"],"confidence":"Medium","gaps":["Covalent modification site not identified","Single lab"]},{"year":2017,"claim":"Resolved TRPM4 architecture and the structural basis of ATP inhibition, monovalent selectivity, and assembly via cryo-EM.","evidence":"Cryo-EM of mouse TRPM4 ±ATP and human TRPM4 with Ca2+/decavanadate, with functional validation","pmids":["29211714","29211723"],"confidence":"High","gaps":["Open/conducting state not captured in these structures","PIP2-bound state not resolved"]},{"year":2017,"claim":"Defined the tripartite SUR1-TRPM4-AQP4 complex as the molecular machine driving high-capacity water flux and astrocyte swelling.","evidence":"Co-IP, FRET, calcein swelling assay in COS-7/astrocytes, in vivo cold-injury model with genetic inactivation","pmids":["28906027"],"confidence":"High","gaps":["Stoichiometry of the tripartite complex not determined","Coupling mechanism between ion and water channels unresolved at this stage"]},{"year":2018,"claim":"Captured the closed Na+-bound state, defining upper/lower gates, lipid sites, and intramolecular gating contacts.","evidence":"Cryo-EM at 3.7 Å with detailed pore, glycosylation, and lipid-site analysis","pmids":["29463718"],"confidence":"High","gaps":["Conformational transitions to the open state not visualized"]},{"year":2018,"claim":"Provided the first structure-informed disease mechanism: S6 activation-gate gain-of-function mutations cause erythrokeratodermia by raising basal channel activity and keratinocyte proliferation.","evidence":"Genetic sequencing, cryo-EM-informed analysis, mutant patch-clamp, keratinocyte proliferation assays","pmids":["30528822"],"confidence":"High","gaps":["Link between depolarization and proliferation not fully mechanistic","In vivo skin phenotype not modeled"]},{"year":2018,"claim":"Defined TRPM4 as a downstream depolarizing element required for bitter/sweet/umami taste transduction alongside TRPM5.","evidence":"Single, double KO mice with Ca2+ imaging and behavioral taste assays","pmids":["29311301"],"confidence":"High","gaps":["Relative contribution of TRPM4 vs TRPM5 per cell type not separated"]},{"year":2018,"claim":"Expanded TRPM4 function to regulated exocytosis by showing it cooperates with NCX to drive mucin secretion in epithelia.","evidence":"Pharmacological TRPM4/NCX inhibition with mucin secretion assays in multiple epithelial cell lines","pmids":["30482841"],"confidence":"Medium","gaps":["No genetic confirmation","Physical TRPM4-NCX interaction not shown"]},{"year":2018,"claim":"Localized neuronal TRPM4 to soma/proximal dendrites with a resting-active current, and to inspiratory pattern generation, defining a role in setting excitability.","evidence":"Immunofluorescence and perforated-patch with local 9-phenanthrol perfusion; RT-PCR and pharmacology in preBötzinger neurons","pmids":["29440991","29435486"],"confidence":"Medium","gaps":["9-phenanthrol selectivity is a caveat","No genetic loss-of-function in these neuronal studies"]},{"year":2018,"claim":"Linked TRPM4 to prostate cancer EMT and invasion via Snail1, defining a metastasis-relevant role.","evidence":"shRNA knockdown, overexpression, EMT marker Westerns, migration/invasion assays","pmids":["30343491"],"confidence":"Medium","gaps":["Connection between ion flux and Snail1 regulation unresolved","Single lab"]},{"year":2019,"claim":"Identified EB1/EB2 as the trafficking partners directing TRPM4 anterograde transport that supports focal adhesion turnover and invasion.","evidence":"Co-IP, motif mutagenesis, localization imaging, dominant-negative EB fragment, focal adhesion and invasion assays","pmids":["31112396"],"confidence":"Medium","gaps":["EB-binding motif not structurally mapped","Single lab"]},{"year":2019,"claim":"Defined a tPA/plasmin/PAR1/TRPC3 pathway that opens SUR1-TRPM4 to drive phasic MMP-9 secretion from inflamed brain endothelium.","evidence":"Patch-clamp, ELISA/zymography for MMP-9, genetic and pharmacological inhibition, Ca2+ imaging","pmids":["29617457"],"confidence":"Medium","gaps":["Direct physical coupling to TRPC3 not shown","Single lab"]},{"year":2020,"claim":"Revealed a physical TRPM4-NMDA receptor complex that mediates excitotoxic death independently of NMDAR Ca2+ flux, defining a druggable interface.","evidence":"Co-IP, structure-based drug screening, Ca2+ imaging, and neuronal loss in stroke and retinal degeneration models","pmids":["33033186"],"confidence":"High","gaps":["Atomic structure of the interface not resolved","How the complex executes death without altering Ca2+ not fully defined"]},{"year":2020,"claim":"Showed TRPM4 drives plateau potentials and oscillatory firing in thalamic reticular neurons via T-type Ca2+ channel input.","evidence":"Thalamic slice electrophysiology with TRPM4 and T-type channel pharmacology","pmids":["32414784"],"confidence":"Medium","gaps":["Pharmacology-only, no genetic confirmation"]},{"year":2020,"claim":"Linked TRPM4 upregulation to cardiac fibrogenesis by showing TGFβ1 increases fibroblast TRPM4 currents in heart failure.","evidence":"Patch-clamp of primary human fibroblasts, Western blot, TGFβ1 stimulation","pmids":["33594499"],"confidence":"Medium","gaps":["Functional consequence for fibrosis not directly tested","Single lab"]},{"year":2021,"claim":"Resolved the NO/cGMP/PKG vasodilation mechanism as IRAG-mediated suppression of IP3R Ca2+ release that withdraws Ca2+ activation of TRPM4.","evidence":"Electrophysiology, Ca2+ imaging, sGC/PKG inhibitors, IRAG siRNA, superresolution microscopy, myogenic response","pmids":["34734188"],"confidence":"High","gaps":["Direct PKG phosphorylation of TRPM4 itself not demonstrated"]},{"year":2021,"claim":"Established TRPM4 as a negative-feedback regulator of Ca2+ entry in pancreatic acinar cells through depolarization.","evidence":"Trpm4-/- mice, whole-cell/perforated patch, CBA inhibition, Ca2+ imaging with cerulein","pmids":["34329682"],"confidence":"High","gaps":["Relevance to pancreatitis pathophysiology not established in this study"]},{"year":2021,"claim":"Identified TRPM4 as a mechanosensory signaling component driving pressure-overload left ventricular hypertrophy.","evidence":"Cardiomyocyte-specific conditional Trpm4 KO with transverse aortic constriction","pmids":["34190686"],"confidence":"High","gaps":["Direct mechanosensing mechanism of TRPM4 not defined","Downstream hypertrophic signaling not mapped"]},{"year":2022,"claim":"Established TRPM4 as a contributor to triggered ventricular arrhythmias via a Ca2+ overload-induced background current.","evidence":"Trpm4-/- mice, compound screening (meclofenamate), in vitro electrophysiology, in vivo ECG in proarrhythmic models","pmids":["35822895"],"confidence":"High","gaps":["Meclofenamate selectivity caveat","Subcellular Ca2+ source not pinpointed"]},{"year":2022,"claim":"Defined transcriptional control of TRPM4 by p53/p63γ, linking tumor-suppressor loss to elevated TRPM4 currents and altered cell cycle.","evidence":"CRISPR KO, p53/p63γ overexpression, promoter-reporter, patch-clamp, Ca2+ imaging, cell cycle analysis in colorectal cells","pmids":["35500522"],"confidence":"Medium","gaps":["Direct p53 binding to TRPM4 promoter regions not fully mapped","Single lab"]},{"year":2022,"claim":"Showed TRPM4 can suppress migration via a Ca2+/calpain/FAK axis, indicating context-dependent pro- and anti-invasive roles across cancers.","evidence":"Overexpression, calpain inhibition rescue, Western blots, migration assays, in vivo tumor model in colorectal cells","pmids":["36147460"],"confidence":"Medium","gaps":["Reconciliation with pro-invasive prostate findings not addressed","Single lab"]},{"year":2023,"claim":"Defined the downstream Na+/NCX1/calmodulin/AQP4 cascade by which SUR1-TRPM4 in astrocyte endfeet causes post-ischemic brain swelling.","evidence":"Mouse ischemic stroke, SUR1-TRPM4 and NCX1 inhibition, astrocyte-specific deletion, Ca2+ imaging, AQP4 surface assays","pmids":["37279286"],"confidence":"High","gaps":["Whether NCX1 physically associates with the complex not shown"]},{"year":2023,"claim":"Demonstrated functional coupling of TRPM4 to mechanosensitive Piezo1 and to TRPV4, positioning it as a shared depolarizing effector for upstream Ca2+ channels.","evidence":"siRNA, pharmacology, voltage/Ca2+ imaging in HL-1 cells and heterologous TRPV4/TRPM4 co-expression","pmids":["38098265","35432302"],"confidence":"Medium","gaps":["Direct physical interaction with Piezo1/TRPV4 not established","Cell-line models"]},{"year":2023,"claim":"Identified TRPM4-mediated Na+ influx and swelling as essential for ErSO-induced necrotic cancer cell death through sustained UPR hyperactivation.","evidence":"Genome-wide CRISPR screen, TRPM4 KO cells and tumor models, volume and ATP-depletion assays","pmids":["37522838"],"confidence":"High","gaps":["Mechanism connecting Na+/swelling to UPR amplification not fully defined"]},{"year":2023,"claim":"Established that age-dependent PIP2 depletion via TGF-β-driven PI3K hyperactivity impairs TRPM4 and vascular myogenic response in a Gould syndrome model.","evidence":"Patch-clamp of native SMCs from Col4a1 mutant mice, PIP2 dialysis, PI3K and TGF-β inhibitors, myogenic measurements","pmids":["36693102"],"confidence":"High","gaps":["Generality beyond Col4a1 mutant model not established"]},{"year":2025,"claim":"Mapped the inhibitor-binding pocket (S3/S4/TRP helices and S4-S5 linker) and defined species-specific NECSO pharmacology, enabling rational modulation of necrotic cell death.","evidence":"Cryo-EM in nanodiscs ±NBA/IBA with patch-clamp validation; domain swapping and docking for NC1, with KO and GoF-mutant cell death assays","pmids":["39828793","39915626"],"confidence":"High","gaps":["Open-state structure with bound activators not resolved","Therapeutic window for NECSO-based therapy not defined"]},{"year":null,"claim":"How TRPM4's identical depolarizing activity produces opposing pro- vs anti-proliferative/invasive outcomes across tissues, and how ion flux is coupled to non-electrical signaling (β-catenin, Akt, calpain/FAK, UPR), remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying mechanism linking depolarization to the divergent transcriptional/proliferative phenotypes","Open/conducting structural state and activator-bound states not yet captured","Physical versus functional nature of several reported channel couplings (Piezo1, TRPV4, NCX, TRPC3) not always distinguished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[10,18,30,42]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1,3]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,16,3]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[42,1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,10,17,15]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[27]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,20,10]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[18,31,32]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,34,35,8]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[29,45,46,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,13,47,19]}],"complexes":["SUR1-TRPM4 (NC(Ca-ATP)) channel","SUR1-TRPM4-AQP4 tripartite channel complex","TRPM4 homotetramer","TRPM4-NMDA receptor complex"],"partners":["ABCC8 (SUR1)","AQP4","GRIN1/NMDA RECEPTOR","MAPRE1 (EB1)","MAPRE2 (EB2)","PRKCD (PKCΔ)","NCX1","TRPV4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TD43","full_name":"Transient receptor potential cation channel subfamily M member 4","aliases":["Calcium-activated non-selective cation channel 1","Long transient receptor potential channel 4","LTrpC-4","LTrpC4","Melastatin-4"],"length_aa":1214,"mass_kda":134.3,"function":"Calcium-activated selective cation channel that mediates membrane depolarization (PubMed:12015988, PubMed:12842017, PubMed:29211723, PubMed:30528822). While it is activated by increase in intracellular Ca(2+), it is impermeable to it (PubMed:12015988). Mediates transport of monovalent cations (Na(+) > K(+) > Cs(+) > Li(+)), leading to depolarize the membrane (PubMed:12015988). It thereby plays a central role in cadiomyocytes, neurons from entorhinal cortex, dorsal root and vomeronasal neurons, endocrine pancreas cells, kidney epithelial cells, cochlea hair cells etc. Participates in T-cell activation by modulating Ca(2+) oscillations after T lymphocyte activation, which is required for NFAT-dependent IL2 production. Involved in myogenic constriction of cerebral arteries. Controls insulin secretion in pancreatic beta-cells. May also be involved in pacemaking or could cause irregular electrical activity under conditions of Ca(2+) overload. Affects T-helper 1 (Th1) and T-helper 2 (Th2) cell motility and cytokine production through differential regulation of calcium signaling and NFATC1 localization. Enhances cell proliferation through up-regulation of the beta-catenin signaling pathway. Plays a role in keratinocyte differentiation (PubMed:30528822) Lacks channel activity","subcellular_location":"Cell membrane; Endoplasmic reticulum; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/Q8TD43/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRPM4","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRPM4","total_profiled":1310},"omim":[{"mim_id":"618531","title":"ERYTHROKERATODERMIA VARIABILIS ET PROGRESSIVA 6; EKVP6","url":"https://www.omim.org/entry/618531"},{"mim_id":"606936","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY M, MEMBER 4; TRPM4","url":"https://www.omim.org/entry/606936"},{"mim_id":"604600","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY M, MEMBER 5; 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Cancer.","date":"2022","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/35158942","citation_count":19,"is_preprint":false},{"pmid":"36693102","id":"PMC_36693102","title":"Faulty TRPM4 channels underlie age-dependent cerebral vascular dysfunction in Gould syndrome.","date":"2023","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/36693102","citation_count":19,"is_preprint":false},{"pmid":"28224334","id":"PMC_28224334","title":"The TRPM4 channel is functionally important for the beneficial cardiac remodeling induced by endurance training.","date":"2017","source":"Journal of muscle research and cell motility","url":"https://pubmed.ncbi.nlm.nih.gov/28224334","citation_count":19,"is_preprint":false},{"pmid":"31042750","id":"PMC_31042750","title":"Glibenclamide, a Sur1-Trpm4 antagonist, does not improve outcome after collagenase-induced intracerebral hemorrhage.","date":"2019","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/31042750","citation_count":19,"is_preprint":false},{"pmid":"38098265","id":"PMC_38098265","title":"Functional coupling between Piezo1 and TRPM4 influences the electrical activity of HL-1 atrial myocytes.","date":"2023","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/38098265","citation_count":18,"is_preprint":false},{"pmid":"19945433","id":"PMC_19945433","title":"Cloning and characterization of rat transient receptor potential-melastatin 4 (TRPM4).","date":"2009","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/19945433","citation_count":18,"is_preprint":false},{"pmid":"34329682","id":"PMC_34329682","title":"TRPM4 links calcium signaling to membrane potential in pancreatic acinar cells.","date":"2021","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34329682","citation_count":18,"is_preprint":false},{"pmid":"28214884","id":"PMC_28214884","title":"Transient Receptor Potential Melastatin 4 (TRPM4) Contributes to High Salt Diet-Mediated Early-Stage Endothelial Injury.","date":"2017","source":"Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/28214884","citation_count":18,"is_preprint":false},{"pmid":"29440991","id":"PMC_29440991","title":"Subcellular Localization and Activity of TRPM4 in Medial Prefrontal Cortex Layer 2/3.","date":"2018","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/29440991","citation_count":18,"is_preprint":false},{"pmid":"30054681","id":"PMC_30054681","title":"Involvement of TRPM4 in detrusor overactivity following spinal cord transection in mice.","date":"2018","source":"Naunyn-Schmiedeberg's archives of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/30054681","citation_count":18,"is_preprint":false},{"pmid":"21406958","id":"PMC_21406958","title":"Basal protein kinase Cδ activity is required for membrane localization and activity of TRPM4 channels in cerebral artery smooth muscle cells.","date":"2011","source":"Channels (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/21406958","citation_count":18,"is_preprint":false},{"pmid":"33047172","id":"PMC_33047172","title":"TRPM4 non-selective cation channel in human atrial fibroblast growth.","date":"2020","source":"Pflugers Archiv : European journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/33047172","citation_count":17,"is_preprint":false},{"pmid":"26785754","id":"PMC_26785754","title":"Heterologously-expressed and Liposome-reconstituted Human Transient Receptor Potential Melastatin 4 Channel (TRPM4) is a Functional Tetramer.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/26785754","citation_count":16,"is_preprint":false},{"pmid":"38378185","id":"PMC_38378185","title":"Sodium-Permeable Ion Channels TRPM4 and TRPM5 are Functional in Human Gastric Parietal Cells in Culture and Modulate the Cellular Response to Bitter-Tasting Food Constituents.","date":"2024","source":"Journal of agricultural and food chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38378185","citation_count":16,"is_preprint":false},{"pmid":"33205255","id":"PMC_33205255","title":"Genetic background influences expression and function of the cation channel TRPM4 in the mouse heart.","date":"2020","source":"Basic research in cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/33205255","citation_count":15,"is_preprint":false},{"pmid":"34771564","id":"PMC_34771564","title":"Investigation of Novel Small Molecular TRPM4 Inhibitors in Colorectal Cancer Cells.","date":"2021","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/34771564","citation_count":15,"is_preprint":false},{"pmid":"35056138","id":"PMC_35056138","title":"Pharmacological Modulation and (Patho)Physiological Roles of TRPM4 Channel-Part 1: Modulation of TRPM4.","date":"2022","source":"Pharmaceuticals (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/35056138","citation_count":14,"is_preprint":false},{"pmid":"34002002","id":"PMC_34002002","title":"Development and characterization of a monoclonal antibody blocking human TRPM4 channel.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/34002002","citation_count":14,"is_preprint":false},{"pmid":"32414784","id":"PMC_32414784","title":"TRPM4 Conductances in Thalamic Reticular Nucleus Neurons Generate Persistent Firing during Slow Oscillations.","date":"2020","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/32414784","citation_count":14,"is_preprint":false},{"pmid":"30391667","id":"PMC_30391667","title":"Functional characterization of TRPM4 variants identified in sudden unexpected natural death.","date":"2018","source":"Forensic science international","url":"https://pubmed.ncbi.nlm.nih.gov/30391667","citation_count":14,"is_preprint":false},{"pmid":"39828793","id":"PMC_39828793","title":"Identification of a binding site for small molecule inhibitors targeting human TRPM4.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/39828793","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51971,"output_tokens":11886,"usd":0.167101,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":23377,"output_tokens":10439,"usd":0.18893,"stage2_stop_reason":"end_turn"},"total_usd":0.356031,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"PIP2 counteracts Ca2+ desensitization and rundown of TRPM4 currents, shifts voltage dependence toward negative potentials, and increases Ca2+ sensitivity 100-fold. Neutralization of basic residues in the C-terminal pleckstrin homology (PH) domain accelerated desensitization and attenuated PIP2 effects. PLC-mediated PIP2 breakdown inhibits TRPM4 activity.\",\n      \"method\": \"Inside-out and whole-cell patch-clamp; site-directed mutagenesis of PH domain residues; pharmacological PIP2 depletion; M1 muscarinic receptor activation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro electrophysiology with mutagenesis of specific residues, multiple orthogonal methods, replicated pharmacologically\",\n      \"pmids\": [\"16424899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of mouse TRPM4 (with and without ATP) reveals a three-tiered architecture: N-terminal nucleotide-binding domain (NBD) and C-terminal coiled-coil participate in tetrameric assembly; ATP binds at the NBD and inhibits channel activity; filter residue Gln973 is essential for monovalent selectivity; S1-S4 domain and post-S6 TRP domain form the central gating apparatus housing Ca2+- and PtdIns(4,5)P2-binding sites.\",\n      \"method\": \"Electron cryo-microscopy (cryo-EM) structure determination with and without ATP\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structures with functional validation, two independent structures (±ATP)\",\n      \"pmids\": [\"29211714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of human TRPM4 bound to Ca2+ and decavanadate reveals four C-terminal cytosolic domains forming an umbrella-like structure with coiled-coil pole and helical ribs spanning MHR regions; two decavanadate-binding sites identified (C-terminal domain and intersubunit MHR interface); a selectivity-filter glutamine is an important determinant of monovalent selectivity.\",\n      \"method\": \"Electron cryo-microscopy (cryo-EM) structure determination\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — independent high-resolution cryo-EM structure from a second lab, corroborating and extending mouse TRPM4 structure\",\n      \"pmids\": [\"29211723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structure of full-length human TRPM4 in a closed Na+-bound apo state identifies an upper gate in the selectivity filter and a lower gate at the entrance to the cytoplasmic coiled-coil domain; intramolecular interactions between TRP domain and S4-S5 linker, N-terminal domain, and N/C termini; N-linked glycosylation at one extracellular site; pore-loop disulfide bond; 24 lipid binding sites; five partially hydrated Na+ ions in the conduction pore.\",\n      \"method\": \"Electron cryo-microscopy (cryo-EM) at 3.7 Å resolution\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic resolution cryo-EM structure with detailed structural analysis, independent third structure\",\n      \"pmids\": [\"29463718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structures of full-length human TRPM4 in nanodiscs with and without inhibitors NBA and IBA reveal that small molecule inhibitors bind in a pocket formed between the S3, S4, and TRP helices and the S4-S5 linker. Patch-clamp experiments validated this binding site functionally.\",\n      \"method\": \"Cryo-EM structure determination in native lipid nanodiscs; patch-clamp electrophysiology\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structures with orthogonal functional validation by electrophysiology\",\n      \"pmids\": [\"39828793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SUR1 and TRPM4 co-assemble to form SUR1-TRPM4 heteromeric channels (NC(Ca-ATP) channels). Co-expression yielded channels with biophysical properties of TRPM4 and pharmacological properties of SUR1. Co-assembly with SUR1 doubled TRPM4 affinity for calmodulin and doubled its sensitivity to intracellular calcium. SUR1-TRPM4 heteromers appear de novo after spinal cord injury.\",\n      \"method\": \"FRET; co-immunoprecipitation; whole-cell patch-clamp in co-transfected cells; calmodulin binding assay; spinal cord injury rat model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, FRET, and functional electrophysiology in same study; replicated in injury model\",\n      \"pmids\": [\"23255597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AQP4 physically co-assembles with SUR1-TRPM4 to form a heteromultimeric water/ion channel complex (SUR1-TRPM4-AQP4). The full tripartite complex is required for fast, high-capacity transmembrane water transport driving cell swelling. In a brain edema model, astrocytes newly upregulate SUR1-TRPM4, which co-associates with AQP4, and genetic inactivation of the SUR1-TRPM4-AQP4 complex blocked in vivo astrocyte swelling.\",\n      \"method\": \"Co-immunoprecipitation; FRET; calcein fluorescence cell-swelling assay in COS-7 cells and primary astrocytes; cold-injury mouse model with diolistic labeling\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, FRET, functional swelling assay) with in vivo genetic validation\",\n      \"pmids\": [\"28906027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PKC activity enhances TRPM4 activation by increasing its Ca2+ sensitivity in cerebral arterial smooth muscle cells. PKCδ-dependent phosphorylation promotes pressure-induced smooth muscle depolarization and myogenic vasoconstriction. TRPM4 antisense knockdown in cerebral arteries reduced TRPM4-like currents and diminished PKC-induced depolarization and vasoconstriction.\",\n      \"method\": \"Patch-clamp electrophysiology; antisense oligonucleotide knockdown; phorbol ester (PMA) stimulation; myogenic tone measurement in isolated cerebral arteries\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — antisense knockdown with functional rescue, pharmacological PKC manipulation, electrophysiology, and myogenic tone measurements\",\n      \"pmids\": [\"17293488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRPM4 physically couples to NMDA receptors via intracellular domains located in the near-membrane portions of the receptors. This interaction is required for NMDAR-mediated excitotoxicity; disrupting the NMDAR/TRPM4 complex eliminates toxicity without affecting NMDAR-induced Ca2+ signals. Structure-based computational drug screening using the TRPM4-NMDAR interaction interface identified small molecules that disrupt this complex and reduce neuronal loss in mouse models of stroke and retinal degeneration.\",\n      \"method\": \"Co-immunoprecipitation; structure-based computational drug screening; neuronal loss assays in mouse stroke and retinal degeneration models; Ca2+ imaging\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — physical interaction validated by co-IP, functional disruption with small molecules, replicated in multiple in vivo disease models\",\n      \"pmids\": [\"33033186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKCδ activity maintains TRPM4 channel protein at the plasma membrane of cerebral artery smooth muscle cells. siRNA-mediated downregulation or pharmacological inhibition of PKCδ causes TRPM4 to move from plasma membrane into the cytosol and diminishes TRPM4-dependent currents.\",\n      \"method\": \"siRNA knockdown of PKCδ; pharmacological PKCδ inhibition (rottlerin); immunolabeling; perforated-patch electrophysiology\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal approaches (genetic and pharmacological) in same lab, single study\",\n      \"pmids\": [\"21406958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TRPM4 controls membrane potential and electrical activity in insulin-secreting INS-1 beta-cells by generating large depolarizing currents in response to increased intracellular Ca2+. A dominant-negative TRPM4 construct significantly decreased insulin secretion in response to glucose and vasopressin. TRPM4-containing vesicles are recruited to the plasma membrane during Ca2+-dependent exocytosis.\",\n      \"method\": \"Patch-clamp electrophysiology; dominant-negative TRPM4 construct; insulin secretion assay; capacitance measurements; FM1-43 dye; confocal imaging\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative functional knockdown with multiple orthogonal readouts (secretion, capacitance, vesicle imaging)\",\n      \"pmids\": [\"16806463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRPM4 controls migration of bone marrow-derived mast cells (BMMCs). TRPM4 knockout BMMCs fail to migrate in response to DNP-HSA or SCF. TRPM4 regulates Ca2+-dependent F-actin rearrangements required for cell migration.\",\n      \"method\": \"TRPM4 knockout mice; migration assays; cytochalasin B inhibition; phalloidin immunofluorescence for F-actin\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model with functional assay and mechanistic link to F-actin, single lab\",\n      \"pmids\": [\"19046767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"De novo upregulation of TRPM4 in spinal cord capillaries renders cells susceptible to oncotic swelling and death upon ATP depletion. In vivo, Trpm4 antisense treatment or Trpm4-/- mice prevented secondary hemorrhage, capillary fragmentation, and reduced lesion volume after spinal cord injury.\",\n      \"method\": \"Rodent spinal cord injury models; antisense knockdown in rats; Trpm4-/- mice; cell swelling assays in COS-7 cells expressing TRPM4; histology\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent genetic suppression approaches (antisense + KO), in vitro mechanistic validation, published in high-impact journal\",\n      \"pmids\": [\"19169264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRPM4 is expressed at higher levels in Th2 versus Th1 cells and differentially regulates Ca2+ influx and NFATc1 nuclear localization. Inhibition of TRPM4 expression increased Ca2+ influx in Th2 cells and decreased it in Th1 cells, altering cytokine production and T cell motility.\",\n      \"method\": \"siRNA knockdown; Ca2+ imaging; nuclear localization assays; cytokine measurements; motility assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with multiple functional readouts, single lab\",\n      \"pmids\": [\"20656926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPM4 deficiency or pharmacological inhibition reduces axonal and neuronal degeneration in EAE without altering immune function. TRPM4 mediates Na+ influx and oncotic cell swelling upon excitotoxic stimulation in neurons.\",\n      \"method\": \"Trpm4-/- mice; EAE model; glibenclamide pharmacological inhibition; electrophysiological recordings of ion influx; cell swelling measurements in vitro\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO and pharmacological inhibition converging on same phenotype, mechanistic electrophysiology included\",\n      \"pmids\": [\"23160238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"N-linked glycosylation of TRPM4 occurs at a unique residue Asn992. Abolishing glycosylation by N992Q mutation or tunicamycin treatment differentially affects current density but does not alter channel trafficking to the plasma membrane, indicating glycosylation mainly regulates TRPM4 function rather than surface expression.\",\n      \"method\": \"Site-directed mutagenesis (N992Q); tunicamycin treatment; Western blot; patch-clamp electrophysiology; surface biotinylation\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus pharmacological glycosylation inhibition with electrophysiology, single lab, somewhat contradictory results between mutation and drug treatment\",\n      \"pmids\": [\"24605085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PIP2 and PIP3 interact with the E733-W772 proximal N-terminal region of TRPM4. Residues R755 and R767 are important for PIP2/PIP3 binding; their mutation caused partial loss of binding specificity.\",\n      \"method\": \"Biophysical binding assays; molecular modeling; mutagenesis of R755 and R767\",\n      \"journal\": \"Biophysical chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro binding assay with mutagenesis, but single lab and limited functional electrophysiological validation\",\n      \"pmids\": [\"26071843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPM4 interacts with end-binding (EB) proteins EB1 and EB2 via a putative motif in TRPM4. Mutations abolishing this interaction reduce mature plasma membrane TRPM4 and result in ER-associated distribution. EB1/EB2 are required for TRPM4 anterograde trafficking and functional activity, which in turn regulate focal adhesion disassembly and cell invasion.\",\n      \"method\": \"Co-immunoprecipitation; mutagenesis of EB binding motif; subcellular localization imaging; dominant-negative EB binding fragment; focal adhesion assays; invasion assays\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus mutagenesis plus functional readouts, single lab\",\n      \"pmids\": [\"31112396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRPM4 is activated by Ca2+-induced Ca2+ release in mouse ventricular myocytes and its loss in Trpm4-/- mice leads to increased β-adrenergic inotropic response, shortened action potential duration at 50% and 90% repolarization, and increased driving force for L-type Ca2+ current.\",\n      \"method\": \"Trpm4-/- mice; patch-clamp; membrane potential measurements; microfluorometry; contractility measurements; in vivo pressure-volume loop analysis\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with multiple orthogonal in vitro and in vivo functional readouts\",\n      \"pmids\": [\"24226423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In TLR4-activated microglia, Sur1-Trpm4 channels regulate Ca2+ influx to control NFAT nuclear translocation and downstream NOS2 transcription. Inhibiting or silencing Sur1 or Trpm4 increased [Ca2+]i but paradoxically decreased NFAT nuclear translocation via phosphorylation of CaMKII and calcineurin.\",\n      \"method\": \"In vivo and in vitro microglia; LPS activation; patch-clamp; calcium imaging; chromatin immunoprecipitation; co-immunoprecipitation; immunohistochemistry; qPCR; Griess assay; Trpm4-/- and Abcc8-/- mice\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including ChIP, co-IP, electrophysiology, KO mice, and genetic silencing in same study\",\n      \"pmids\": [\"27246103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NO/cGMP/PKG signaling causes vasodilation by inhibiting TRPM4 channel activity in cerebral artery smooth muscle cells. PKG phosphorylates IRAG, which then inhibits IP3R-mediated Ca2+ release from the SR, thereby reducing Ca2+-dependent TRPM4 activation. IRAG, PKG, and IP3Rs form a nanoscale signaling complex on the SR. IRAG knockdown diminished NO-mediated TRPM4 inhibition and vasodilation.\",\n      \"method\": \"Electrophysiology; Ca2+ imaging; pharmacological inhibition of sGC and PKG; siRNA knockdown of IRAG; superresolution microscopy; isolated cerebral artery myogenic response measurements\",\n      \"journal\": \"Function (Oxford, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockdown with pharmacological validation, multiple methods including superresolution microscopy, functional vascular readouts\",\n      \"pmids\": [\"34734188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Na+ influx through SUR1-TRPM4 in perivascular astrocyte endfeet drives Ca2+ entry through NCX1 operating in reverse mode, raising intra-endfoot Ca2+ which stimulates calmodulin-dependent AQP4 translocation to the plasma membrane, causing water influx and brain swelling after ischemic stroke.\",\n      \"method\": \"Mouse ischemic stroke model; pharmacological inhibition of SUR1-TRPM4 and NCX1; astrocyte-specific gene deletion; Ca2+ imaging; AQP4 surface localization assays\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific genetic deletion plus pharmacological inhibition plus Ca2+ imaging establishing molecular mechanism chain\",\n      \"pmids\": [\"37279286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 gain-of-function mutations (p.Ile1033Met and p.Ile1040Thr) in the S6 transmembrane domain, corresponding to the activation gate per cryo-EM structures, cause autosomal dominant progressive symmetric erythrokeratodermia. Mutant channels show pronounced baseline activity, enhanced Ca2+ sensitivity, and elevated resting membrane potential, and enhance keratinocyte proliferation.\",\n      \"method\": \"Genetic sequencing; cryo-EM structural analysis; patch-clamp electrophysiology of mutants; keratinocyte proliferation assays\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure-informed mutagenesis with electrophysiology and cellular phenotype, multiple families\",\n      \"pmids\": [\"30528822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The TRPM4 variant p.I376T causes gain of surface expression and increased current density in HEK293 cells, establishing a gain-of-expression/function mechanism for progressive familial heart block type I.\",\n      \"method\": \"Whole-cell patch-clamp; Western blot; surface expression analysis in HEK293 cells\",\n      \"journal\": \"International journal of cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus biochemical surface expression in same study, single lab\",\n      \"pmids\": [\"26820365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRPM4 silencing promotes GSK-3β-dependent degradation of β-catenin and reduces β-catenin/Tcf/Lef transcriptional activity, decreasing HeLa cell proliferation. TRPM4 overexpression increases cell proliferation and β-catenin levels. TRPM4 functions as a regulator of the β-catenin signaling pathway.\",\n      \"method\": \"siRNA knockdown; TRPM4 overexpression; Western blot for β-catenin phosphorylation; Tcf/Lef reporter assay; proliferation assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function approaches converging on β-catenin pathway, single lab\",\n      \"pmids\": [\"20625999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRPM4 silencing in PC3 prostate cancer cells decreases Akt1 phosphorylation, increases GSK-3β activity, and promotes β-catenin degradation, reducing nuclear β-catenin and Tcf/Lef transcription. The effect on Akt1 is mediated through the calcium/calmodulin-EGFR axis.\",\n      \"method\": \"siRNA knockdown; TRPM4 overexpression; Western blot for phosphorylated GSK-3β, β-catenin, Akt; Tcf/Lef reporter assay\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — convergent loss- and gain-of-function, multiple pathway readouts, single lab\",\n      \"pmids\": [\"28614631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 knockdown in PC3 prostate cancer cells reduces Snail1 expression and causes partial reversion of EMT (altered MMP9, E-cadherin/N-cadherin, vimentin), decreasing migration and invasion. TRPM4 overexpression in LNCaP cells increases Snail1, reduces E-cadherin, and increases migration.\",\n      \"method\": \"shRNA knockdown; TRPM4 overexpression; Western blot for EMT markers; migration/invasion assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with multiple molecular readouts, single lab\",\n      \"pmids\": [\"30343491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRPM4 currents in primary cilia of renal mIMCD-3 cells have EC50 ~646 µM for Ca2+ at +100 mV, are inhibited by MgATP and 9-phenanthrol, are not permeable to Ca2+ or Cl-, and are modulated by PIP2. shRNA reduction of Trpm4 shortened primary cilia by 43%.\",\n      \"method\": \"Direct patch-clamp recording from excised primary cilia; shRNA knockdown; pharmacological characterization\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiology from native cilia, genetic knockdown with structural phenotype, single lab\",\n      \"pmids\": [\"26290373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"U73122 (PLC inhibitor) is a potent agonist of TRPM4 channels that acts through covalent modification, independently of PLC, PIP2 depletion, and Ca2+. It activates endogenous TRPM4 in CHO, Jurkat, and HEK293T cells and recombinant human TRPM4. TRPM5 was insensitive to U73122, showing selectivity within the TRPM family.\",\n      \"method\": \"Whole-cell patch-clamp; pharmacological characterization; comparison of TRPM4, TRPM3, TRPM5 responses\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology in multiple cell types with endogenous and recombinant channels, single lab\",\n      \"pmids\": [\"27328745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 is present in TRPM4 is expressed in medial prefrontal cortex layer 2/3 pyramidal neurons and interneurons, localizing to soma and proximal dendrites but not the axon initial segment. A 9-phenanthrol-sensitive TRPM4-like current is active at resting membrane potential, and local somatic perfusion of 9-phenanthrol reduces basal current.\",\n      \"method\": \"Multiplex immunofluorescence; perforated patch-clamp; local superfusion experiments\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — localization and electrophysiology combined with local pharmacology, single lab\",\n      \"pmids\": [\"29440991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRPM4 in pancreatic acinar cells mediates Ca2+-dependent membrane depolarization (from -44.4 to -27.7 mV), which reduces the inward driving force for Ca2+ entry. TRPM4 KO or pharmacological inhibition (CBA) increases Ca2+ influx and augments Ca2+ oscillation amplitude induced by cerulein, identifying TRPM4 as a negative feedback regulator of Ca2+ entry.\",\n      \"method\": \"Trpm4-/- mice; patch-clamp (whole-cell and perforated); CBA pharmacological inhibition; Ca2+ imaging; cerulein stimulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse and pharmacological inhibition converging on same functional phenotype with mechanistic Ca2+ measurements\",\n      \"pmids\": [\"34329682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRPM4 mediates a Ca2+ overload-induced background current in ventricular cardiomyocytes. Trpm4-/- mice and meclofenamate (identified as a potent TRPM4 antagonist) both reduced Ca2+-dependent triggered arrhythmias in two proarrhythmic mouse models, establishing TRPM4 as a contributor to triggered cardiac arrhythmias.\",\n      \"method\": \"Trpm4-/- mice; compound screening; in vitro electrophysiology; in vivo intracardiac and telemetric ECG; meclofenamate pharmacology\",\n      \"journal\": \"European heart journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO and pharmacological inhibition converging on in vivo arrhythmia phenotype\",\n      \"pmids\": [\"35822895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Selective deletion of TRPM4 in mouse cardiomyocytes reduces pressure overload-induced left ventricular hypertrophy by ~50%, identifying TRPM4 as a component of the mechanosensory signaling pathway that induces LVH in response to pressure overload.\",\n      \"method\": \"Cardiomyocyte-specific Trpm4 conditional KO mice; transverse aortic constriction model; cardiac morphology and function measurements\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO with quantitative phenotypic readout in a well-established disease model\",\n      \"pmids\": [\"34190686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Piezo1 and TRPM4 are functionally coupled in HL-1 atrial myocyte-like cells: Yoda1-induced Piezo1 activation alters action potential frequency, and this effect is significantly reduced by TRPM4 knockdown or pharmacological inhibition.\",\n      \"method\": \"siRNA knockdown of Piezo1 and TRPM4; 9-phenanthrol pharmacology; FluoVolt voltage imaging; Yoda1 agonist stimulation\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — convergent genetic and pharmacological approaches, but in cell line model, single lab\",\n      \"pmids\": [\"38098265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRPM4 plays a pivotal role in necrosis-inducing cancer therapy (ErSO/BHPI). CRISPR screen identified TRPM4 as essential for necrotic cell death; TRPM4 KO abolished ErSO-induced tumor regression in mice. Mechanistically, ErSO activates unfolded protein response (a-UPR), and TRPM4-mediated Na+ influx and cell swelling sustain and propagate lethal a-UPR hyperactivation.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen; TRPM4 KO cells and in vivo tumor models; cell volume measurement; ATP depletion assay; macrophage activation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide unbiased screen confirmed by KO with multiple orthogonal in vitro and in vivo readouts\",\n      \"pmids\": [\"37522838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRPM4 persistent activation by the small molecule NC1 causes necrosis via sodium overload (NECSO). NC1 specifically activates human TRPM4 but not mouse TRPM4 due to differences in a transmembrane region identified by domain swapping and molecular docking. Gain-of-function cardiac arrhythmia mutations increase NECSO vulnerability. TRPM4-deficient cells are resistant to NC1-induced necrosis.\",\n      \"method\": \"TRPM4-deficient cells; domain swapping; molecular docking; cell death assays; compound screening for NECSO inhibitors\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mechanistic domain swapping plus molecular docking plus genetic KO plus pharmacological rescue, multiple orthogonal methods\",\n      \"pmids\": [\"39915626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 and TRPM5 are both required for taste transduction in type II taste receptor cells. Loss of either channel significantly impairs taste detection; loss of both abolishes detection of bitter, sweet, or umami stimuli. TRPM4 functions as a downstream component in these taste signaling pathways.\",\n      \"method\": \"TRPM4 KO and TRPM5 KO mice; double KO mice; live cell Ca2+ imaging; behavioral taste assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — single and double KO mouse models with convergent in vitro and behavioral readouts\",\n      \"pmids\": [\"29311301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 and NCX2 functionally cooperate to control Ca2+-mediated MUC2 and MUC5AC mucin secretion. Blocking TRPM4 or NCX activity abrogated mucin secretion in colonic, bronchial, and cystic fibrosis tracheal cells. TRPM4 and NCXs are both required for regulated mucin secretion.\",\n      \"method\": \"TRPM4 and NCX pharmacological inhibition; mucin secretion assays in HT29-18N2, NHBE, and CFT1-LC3 cells; Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with functional secretion readout in multiple cell types, single lab\",\n      \"pmids\": [\"30482841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRPM4 currents in ventricular fibroblasts from heart failure patients are more than 2-fold larger than controls. TGFβ1 treatment of control fibroblasts increases TRPM4 current within 24 hours, suggesting TGFβ1 upregulates TRPM4 expression and links TRPM4 to cardiac fibrogenesis.\",\n      \"method\": \"Patch-clamp electrophysiology of primary human fibroblasts; Western blot; TGFβ1 stimulation\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional electrophysiology in primary human cells with pharmacological manipulation, single lab\",\n      \"pmids\": [\"33594499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"p53 and p63γ repress TRPM4 promoter activity. Loss of p53 increases TRPM4 mRNA, protein, and Na+ currents in colorectal cancer cells. Transient p53 overexpression decreases TRPM4-mediated currents. TRPM4 KO mimics the effect of p53 on store-operated Ca2+ entry and cell cycle distribution.\",\n      \"method\": \"CRISPR-Cas9 KO; p53/p63γ overexpression; promoter-reporter assays; patch-clamp; Ca2+ imaging; cell cycle analysis\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic approaches with functional electrophysiology and Ca2+ readouts, single lab\",\n      \"pmids\": [\"35500522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In colorectal cancer cells, TRPM4 overexpression enhances Ca2+ influx to activate calpain-mediated proteolysis of FAK, and suppresses PI3K/Akt/mTOR signaling, reducing migration and invasion. Calpain inhibition relieves FAK suppression and reverses the migration inhibitory effect, placing TRPM4 upstream of Ca2+/calpain/FAK axis.\",\n      \"method\": \"TRPM4 overexpression; calpain inhibition; Western blot for FAK, Akt, PI3K, mTOR; migration assays; in vivo tumor model\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by calpain inhibition rescue, multiple pathway readouts, single lab\",\n      \"pmids\": [\"36147460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPM4 in NF-κB-activated brain endothelial cells is opened by tPA in a plasmin-, PAR1-, TRPC3-, and Ca2+-dependent manner, and this SUR1-TRPM4 channel activity is required for tPA-induced phasic (but not tonic) MMP-9 secretion.\",\n      \"method\": \"NF-κB activation of brain endothelial cells; patch-clamp electrophysiology; ELISA and zymography for MMP-9; genetic and pharmacological inhibition of SUR1-TRPM4 and TRPC3; Ca2+ imaging\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus secretion assay with genetic and pharmacological manipulation, single lab\",\n      \"pmids\": [\"29617457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Heterologously expressed TRPM4 assembles as a functional tetramer. Purified TRPM4-eGFP in detergent micelles was found to be tetrameric by crosslinking, native gel electrophoresis, multi-angle laser light scattering, and electron microscopy. Liposome-reconstituted TRPM4-eGFP exhibited single-channel activity inhibitable by flufenamic acid.\",\n      \"method\": \"Protein purification; crosslinking; native PAGE; multi-angle laser light scattering; electron microscopy; single-channel electrophysiology of proteoliposomes\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biochemical/biophysical methods to establish tetrameric architecture plus reconstituted functional activity\",\n      \"pmids\": [\"26785754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRPM4 and TRPV4 functionally couple in human trabecular meshwork (TM) cells: TRPV4 agonist (GSK1016790A) activates TRPM4-mediated monovalent cation current and Ca2+ oscillations. TRPM4 silencing antagonized TRPV4-evoked oscillatory signaling; co-expression of TRPV4 and TRPM4 in HEK-293 cells reconstituted oscillations.\",\n      \"method\": \"siRNA knockdown; electrophysiology; Ca2+ imaging; heterologous co-expression in HEK-293 cells; immunofluorescence\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional coupling shown by KD and heterologous reconstitution, single lab\",\n      \"pmids\": [\"35432302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Age-dependent deficiency of TRPM4 currents in cerebral artery smooth muscle cells from Col4a1 mutant mice (Gould syndrome model) underlies impaired vascular myogenic response. Excess PI3K activity consumes PIP2 (required for TRPM4 activity). Dialyzing cells with PIP2 or inhibiting PI3K restored TRPM4 currents and rescued myogenic response. TGF-β signaling drives PI3K hyperactivity to deplete PIP2.\",\n      \"method\": \"Patch-clamp of native SMCs from Col4a1 mutant mice; PIP2 dialysis; PI3K inhibitors; TGF-β receptor inhibition; myogenic response measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple pharmacological and biochemical interventions converging on a defined signaling mechanism, functional vascular readout\",\n      \"pmids\": [\"36693102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRPM4 contributes to plateau potentials and persistent firing in thalamic reticular nucleus neurons, driven by Ca2+ influx through T-type Ca2+ channels. Pharmacological blockade of TRPM4 reduced plateau potentials and slow oscillatory activity.\",\n      \"method\": \"Thalamic slice electrophysiology; pharmacological inhibition of TRPM4; T-type Ca2+ channel blockers; recording in adult mice\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology with pharmacological intervention establishing mechanism, single lab\",\n      \"pmids\": [\"32414784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 channels contribute to respiratory motor pattern formation (amplitude of inspiratory motoneuronal activity) but not rhythmogenesis in pre-Bötzinger complex inspiratory neurons. TRPM4 mRNA is expressed in these neurons. Pharmacological TRPM4 inhibition reduced inspiratory burst amplitude without altering frequency in both in vitro slices and in situ preparations.\",\n      \"method\": \"Single-cell multiplex RT-PCR; TRPM4 pharmacological inhibition; in vitro medullary slice recordings; in situ brainstem-spinal cord preparation recordings; calcium imaging\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mRNA expression combined with pharmacological loss-of-function in two intact preparations, single lab\",\n      \"pmids\": [\"29435486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPM4 ablation dramatically increased mouse mortality in cecal ligation and puncture sepsis due to impaired macrophage Ca2+ mobilization, downregulated AKT signaling, and decreased phagocytic activity, resulting in bacterial overgrowth. Trpm4-/- neutrophils showed no alteration in function or Ca2+ mobilization, demonstrating cell-type-specific Ca2+ regulatory mechanisms.\",\n      \"method\": \"Trpm4-/- mice; cecal ligation and puncture model; Ca2+ imaging; AKT signaling analysis; phagocytosis assays; bacterial enumeration\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with multiple mechanistic readouts (Ca2+, AKT, phagocytosis) and in vivo infection model\",\n      \"pmids\": [\"22933633\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRPM4 is a Ca2+-activated, voltage-dependent, monovalent-selective (Na+/K+) non-selective cation channel that forms functional homotetramers; its gating is positively regulated by PIP2 (acting through C-terminal PH domain and N-terminal basic residues), negatively regulated by ATP (binding to the N-terminal nucleotide-binding domain), potentiated by PKC (which also promotes its plasma membrane localization via PKCδ), inhibited by the NO/cGMP/PKG/IRAG pathway, and its surface trafficking depends on EB1/EB2 microtubule-plus-end proteins; structurally it has an upper selectivity-filter gate and lower coiled-coil gate, with inhibitor-binding pocket between S3/S4/TRP helices and S4-S5 linker; it co-assembles with SUR1 (doubling Ca2+ and calmodulin sensitivity) and further with AQP4 to form a tripartite channel complex that drives oncotic cell swelling and brain edema; it physically couples to NMDA receptors to mediate excitotoxic neuronal death; and it depolarizes the plasma membrane to modulate voltage-gated Ca2+ channel activity and Ca2+ homeostasis in diverse cell types including cardiac myocytes, vascular smooth muscle, pancreatic beta-cells, mast cells, T cells, and neurons—with gain-of-function mutations causing cardiac arrhythmias and skin channelopathies, and sustained activation mediating sodium-overload necrosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRPM4 is a Ca2+-activated, voltage-modulated, monovalent-selective (Na+/K+) non-selective cation channel that assembles as a homotetramer and converts intracellular Ca2+ signals into membrane depolarization across diverse excitable and non-excitable cell types [#42, #10]. Cryo-EM structures define a three-tiered architecture in which an N-terminal nucleotide-binding domain binds inhibitory ATP, C-terminal coiled-coil and MHR regions mediate tetrameric assembly, and the S1-S4/TRP gating module houses Ca2+- and PtdIns(4,5)P2-binding sites controlling an upper selectivity-filter gate and a lower cytoplasmic gate, with a filter glutamine (Gln973) dictating monovalent selectivity [#1, #2, #3]. Gating is tuned by phospholipid and kinase inputs: PIP2 binding to C-terminal PH-domain basic residues and a proximal N-terminal region counteracts desensitization and raises Ca2+ sensitivity, PKCδ phosphorylation increases Ca2+ sensitivity and maintains surface expression, and NO/cGMP/PKG signaling inhibits the channel via IRAG-dependent suppression of IP3R Ca2+ release [#0, #16, #7, #9, #20]. Small-molecule inhibitors bind a pocket between the S3, S4, and TRP helices and the S4-S5 linker [#4], and anterograde trafficking to the plasma membrane depends on EB1/EB2 microtubule-plus-end proteins [#17]. Physiologically, TRPM4-mediated depolarization modulates voltage-gated Ca2+ entry and electrical activity in cerebral arterial smooth muscle myogenic tone, cardiac myocytes, pancreatic beta- and acinar cells, taste receptor cells, and central neurons [#7, #18, #10, #30, #36, #45], and it controls Ca2+-dependent processes including insulin and mucin secretion, mast cell and macrophage function, and T cell NFAT signaling [#10, #37, #11, #47, #13]. TRPM4 co-assembles with SUR1 to form NC(Ca-ATP) channels with doubled calmodulin and Ca2+ sensitivity, and further with AQP4 into a tripartite complex that drives oncotic astrocyte swelling and brain edema after injury, with Na+ influx coupling through reverse-mode NCX1 to trigger AQP4 translocation [#5, #6, #21]. TRPM4 physically couples to NMDA receptors to mediate excitotoxic neuronal death independently of NMDAR Ca2+ signals [#8], and sustained Na+ overload through TRPM4 executes oncotic necrosis exploited in necrosis-inducing cancer therapy [#12, #34, #35]. Gain-of-function S6 mutations cause autosomal dominant progressive symmetric erythrokeratodermia, and gain-of-expression variants cause progressive familial heart block, while TRPM4 contributes to triggered cardiac arrhythmias and pressure-overload hypertrophy [#22, #23, #31, #32].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established how a lipid signal sets TRPM4 sensitivity, explaining why receptor-driven PIP2 hydrolysis dampens the channel and resolving the basis of Ca2+ desensitization.\",\n      \"evidence\": \"Inside-out and whole-cell patch-clamp with PH-domain mutagenesis and pharmacological/M1-receptor PIP2 depletion\",\n      \"pmids\": [\"16424899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural location of the PIP2 site\", \"Functional interplay between PIP2 and ATP regulation not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined a core physiological role: TRPM4 generates Ca2+-triggered depolarizing current that gates electrical activity and hormone secretion in beta-cells.\",\n      \"evidence\": \"Patch-clamp, dominant-negative TRPM4, capacitance and insulin secretion assays, vesicle imaging in INS-1 cells\",\n      \"pmids\": [\"16806463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dominant-negative effects not validated against genetic knockout\", \"Mechanism of TRPM4 vesicular recruitment unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked TRPM4 to vascular tone by showing PKC phosphorylation potentiates the channel to drive myogenic vasoconstriction.\",\n      \"evidence\": \"Patch-clamp, antisense knockdown, PMA stimulation, and myogenic tone measurement in cerebral arteries\",\n      \"pmids\": [\"17293488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation residues not mapped\", \"PKC isoform identity not yet pinned down in this study\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified TRPM4 as the effector of oncotic capillary death after CNS injury, establishing it as a therapeutic target for secondary hemorrhage.\",\n      \"evidence\": \"Spinal cord injury models with antisense and Trpm4-/- mice plus in vitro swelling assays\",\n      \"pmids\": [\"19169264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular partners enabling water flux\", \"Trigger for de novo upregulation not identified here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed PKCδ maintains TRPM4 at the plasma membrane, separating a trafficking control from gating regulation.\",\n      \"evidence\": \"siRNA and pharmacological PKCδ inhibition with immunolabeling and perforated-patch recording in cerebral artery SMCs\",\n      \"pmids\": [\"21406958\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, single cell type\", \"Direct phosphorylation of TRPM4 by PKCδ not demonstrated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected TRPM4 to proliferative β-catenin signaling, indicating a non-electrical role in cell growth.\",\n      \"evidence\": \"siRNA knockdown, overexpression, β-catenin phosphorylation Western blot, Tcf/Lef reporter in HeLa cells\",\n      \"pmids\": [\"20625999\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking channel activity to GSK-3β not defined\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed cell-type-specific immune roles, with TRPM4 required for macrophage Ca2+ mobilization and host defense in sepsis.\",\n      \"evidence\": \"Trpm4-/- mice in cecal ligation/puncture with Ca2+ imaging, AKT analysis, and phagocytosis assays\",\n      \"pmids\": [\"22933633\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling TRPM4 to AKT not resolved\", \"Why neutrophils are unaffected not explained\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the SUR1-TRPM4 heteromeric channel and showed SUR1 doubles calmodulin and Ca2+ sensitivity, explaining injury-induced NC(Ca-ATP) currents.\",\n      \"evidence\": \"FRET, reciprocal co-IP, patch-clamp in co-transfected cells, calmodulin binding assay, spinal cord injury model\",\n      \"pmids\": [\"23255597\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the SUR1-TRPM4 assembly not defined\", \"Structural basis of sensitivity enhancement unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established a cardiac role: TRPM4 shapes ventricular repolarization and β-adrenergic inotropy via Ca2+-induced Ca2+ release.\",\n      \"evidence\": \"Trpm4-/- mice with patch-clamp, contractility, and in vivo pressure-volume analysis\",\n      \"pmids\": [\"24226423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular localization in myocytes not mapped\", \"Coupling to specific Ca2+ release sites not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed TRPM4 differentially sets Ca2+ influx and NFATc1 signaling between Th1 and Th2 cells, tuning adaptive immune output.\",\n      \"evidence\": \"siRNA knockdown, Ca2+ imaging, NFATc1 nuclear localization, cytokine and motility assays\",\n      \"pmids\": [\"20656926\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of opposite effects in Th1 vs Th2 unexplained\", \"siRNA-only, single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped a single N-glycosylation site (Asn992) and showed it regulates function rather than surface trafficking.\",\n      \"evidence\": \"N992Q mutagenesis, tunicamycin, Western blot, patch-clamp, surface biotinylation\",\n      \"pmids\": [\"24605085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mutation and drug results were partly discordant\", \"Functional consequence mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Localized a proximal N-terminal phosphoinositide-binding region (E733-W772, R755/R767), complementing the C-terminal PIP2 determinants.\",\n      \"evidence\": \"Biophysical binding assays, molecular modeling, mutagenesis\",\n      \"pmids\": [\"26071843\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited functional electrophysiological validation\", \"Selectivity between PIP2 and PIP3 not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated native TRPM4 currents in primary cilia and a structural role in cilium length, extending the channel to ciliary signaling.\",\n      \"evidence\": \"Direct patch-clamp from excised cilia, shRNA knockdown, pharmacology in mIMCD-3 cells\",\n      \"pmids\": [\"26290373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking TRPM4 to cilium length unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Confirmed TRPM4 forms a functional homotetramer sufficient for channel activity by reconstitution.\",\n      \"evidence\": \"Purification, crosslinking, native PAGE, MALLS, EM, and single-channel recording of proteoliposomes\",\n      \"pmids\": [\"26785754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve atomic architecture\", \"Regulatory subunit requirements in vivo not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed SUR1-TRPM4 paradoxically controls NFAT-driven NOS2 transcription in activated microglia through Ca2+-dependent CaMKII/calcineurin signaling.\",\n      \"evidence\": \"ChIP, co-IP, patch-clamp, Ca2+ imaging, Trpm4-/- and Abcc8-/- mice with LPS activation\",\n      \"pmids\": [\"27246103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of the paradoxical Ca2+/NFAT relationship incompletely defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended TRPM4 cancer signaling to a Ca2+/calmodulin-EGFR-Akt-GSK-3β-β-catenin axis controlling prostate cancer proliferation.\",\n      \"evidence\": \"siRNA, overexpression, phospho-Western blots, Tcf/Lef reporter in PC3 cells\",\n      \"pmids\": [\"28614631\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct linkage of channel ion flux to Akt unproven\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified the first cardiac gain-of-expression mechanism for a disease variant (p.I376T) in progressive familial heart block type I.\",\n      \"evidence\": \"Whole-cell patch-clamp, Western blot, surface expression in HEK293\",\n      \"pmids\": [\"26820365\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo conduction phenotype not modeled\", \"Heterologous-only system\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Characterized U73122 as a covalent, PLC-independent TRPM4 agonist selective within the TRPM family, refining pharmacology.\",\n      \"evidence\": \"Whole-cell patch-clamp across CHO, Jurkat, HEK293T, and recombinant TRPM4 vs TRPM5\",\n      \"pmids\": [\"27328745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Covalent modification site not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved TRPM4 architecture and the structural basis of ATP inhibition, monovalent selectivity, and assembly via cryo-EM.\",\n      \"evidence\": \"Cryo-EM of mouse TRPM4 ±ATP and human TRPM4 with Ca2+/decavanadate, with functional validation\",\n      \"pmids\": [\"29211714\", \"29211723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Open/conducting state not captured in these structures\", \"PIP2-bound state not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the tripartite SUR1-TRPM4-AQP4 complex as the molecular machine driving high-capacity water flux and astrocyte swelling.\",\n      \"evidence\": \"Co-IP, FRET, calcein swelling assay in COS-7/astrocytes, in vivo cold-injury model with genetic inactivation\",\n      \"pmids\": [\"28906027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the tripartite complex not determined\", \"Coupling mechanism between ion and water channels unresolved at this stage\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Captured the closed Na+-bound state, defining upper/lower gates, lipid sites, and intramolecular gating contacts.\",\n      \"evidence\": \"Cryo-EM at 3.7 Å with detailed pore, glycosylation, and lipid-site analysis\",\n      \"pmids\": [\"29463718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational transitions to the open state not visualized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided the first structure-informed disease mechanism: S6 activation-gate gain-of-function mutations cause erythrokeratodermia by raising basal channel activity and keratinocyte proliferation.\",\n      \"evidence\": \"Genetic sequencing, cryo-EM-informed analysis, mutant patch-clamp, keratinocyte proliferation assays\",\n      \"pmids\": [\"30528822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between depolarization and proliferation not fully mechanistic\", \"In vivo skin phenotype not modeled\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined TRPM4 as a downstream depolarizing element required for bitter/sweet/umami taste transduction alongside TRPM5.\",\n      \"evidence\": \"Single, double KO mice with Ca2+ imaging and behavioral taste assays\",\n      \"pmids\": [\"29311301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of TRPM4 vs TRPM5 per cell type not separated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded TRPM4 function to regulated exocytosis by showing it cooperates with NCX to drive mucin secretion in epithelia.\",\n      \"evidence\": \"Pharmacological TRPM4/NCX inhibition with mucin secretion assays in multiple epithelial cell lines\",\n      \"pmids\": [\"30482841\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No genetic confirmation\", \"Physical TRPM4-NCX interaction not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Localized neuronal TRPM4 to soma/proximal dendrites with a resting-active current, and to inspiratory pattern generation, defining a role in setting excitability.\",\n      \"evidence\": \"Immunofluorescence and perforated-patch with local 9-phenanthrol perfusion; RT-PCR and pharmacology in preBötzinger neurons\",\n      \"pmids\": [\"29440991\", \"29435486\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"9-phenanthrol selectivity is a caveat\", \"No genetic loss-of-function in these neuronal studies\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked TRPM4 to prostate cancer EMT and invasion via Snail1, defining a metastasis-relevant role.\",\n      \"evidence\": \"shRNA knockdown, overexpression, EMT marker Westerns, migration/invasion assays\",\n      \"pmids\": [\"30343491\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Connection between ion flux and Snail1 regulation unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified EB1/EB2 as the trafficking partners directing TRPM4 anterograde transport that supports focal adhesion turnover and invasion.\",\n      \"evidence\": \"Co-IP, motif mutagenesis, localization imaging, dominant-negative EB fragment, focal adhesion and invasion assays\",\n      \"pmids\": [\"31112396\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EB-binding motif not structurally mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a tPA/plasmin/PAR1/TRPC3 pathway that opens SUR1-TRPM4 to drive phasic MMP-9 secretion from inflamed brain endothelium.\",\n      \"evidence\": \"Patch-clamp, ELISA/zymography for MMP-9, genetic and pharmacological inhibition, Ca2+ imaging\",\n      \"pmids\": [\"29617457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical coupling to TRPC3 not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a physical TRPM4-NMDA receptor complex that mediates excitotoxic death independently of NMDAR Ca2+ flux, defining a druggable interface.\",\n      \"evidence\": \"Co-IP, structure-based drug screening, Ca2+ imaging, and neuronal loss in stroke and retinal degeneration models\",\n      \"pmids\": [\"33033186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the interface not resolved\", \"How the complex executes death without altering Ca2+ not fully defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed TRPM4 drives plateau potentials and oscillatory firing in thalamic reticular neurons via T-type Ca2+ channel input.\",\n      \"evidence\": \"Thalamic slice electrophysiology with TRPM4 and T-type channel pharmacology\",\n      \"pmids\": [\"32414784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pharmacology-only, no genetic confirmation\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked TRPM4 upregulation to cardiac fibrogenesis by showing TGFβ1 increases fibroblast TRPM4 currents in heart failure.\",\n      \"evidence\": \"Patch-clamp of primary human fibroblasts, Western blot, TGFβ1 stimulation\",\n      \"pmids\": [\"33594499\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence for fibrosis not directly tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the NO/cGMP/PKG vasodilation mechanism as IRAG-mediated suppression of IP3R Ca2+ release that withdraws Ca2+ activation of TRPM4.\",\n      \"evidence\": \"Electrophysiology, Ca2+ imaging, sGC/PKG inhibitors, IRAG siRNA, superresolution microscopy, myogenic response\",\n      \"pmids\": [\"34734188\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PKG phosphorylation of TRPM4 itself not demonstrated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established TRPM4 as a negative-feedback regulator of Ca2+ entry in pancreatic acinar cells through depolarization.\",\n      \"evidence\": \"Trpm4-/- mice, whole-cell/perforated patch, CBA inhibition, Ca2+ imaging with cerulein\",\n      \"pmids\": [\"34329682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relevance to pancreatitis pathophysiology not established in this study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified TRPM4 as a mechanosensory signaling component driving pressure-overload left ventricular hypertrophy.\",\n      \"evidence\": \"Cardiomyocyte-specific conditional Trpm4 KO with transverse aortic constriction\",\n      \"pmids\": [\"34190686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanosensing mechanism of TRPM4 not defined\", \"Downstream hypertrophic signaling not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established TRPM4 as a contributor to triggered ventricular arrhythmias via a Ca2+ overload-induced background current.\",\n      \"evidence\": \"Trpm4-/- mice, compound screening (meclofenamate), in vitro electrophysiology, in vivo ECG in proarrhythmic models\",\n      \"pmids\": [\"35822895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Meclofenamate selectivity caveat\", \"Subcellular Ca2+ source not pinpointed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined transcriptional control of TRPM4 by p53/p63γ, linking tumor-suppressor loss to elevated TRPM4 currents and altered cell cycle.\",\n      \"evidence\": \"CRISPR KO, p53/p63γ overexpression, promoter-reporter, patch-clamp, Ca2+ imaging, cell cycle analysis in colorectal cells\",\n      \"pmids\": [\"35500522\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct p53 binding to TRPM4 promoter regions not fully mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed TRPM4 can suppress migration via a Ca2+/calpain/FAK axis, indicating context-dependent pro- and anti-invasive roles across cancers.\",\n      \"evidence\": \"Overexpression, calpain inhibition rescue, Western blots, migration assays, in vivo tumor model in colorectal cells\",\n      \"pmids\": [\"36147460\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with pro-invasive prostate findings not addressed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined the downstream Na+/NCX1/calmodulin/AQP4 cascade by which SUR1-TRPM4 in astrocyte endfeet causes post-ischemic brain swelling.\",\n      \"evidence\": \"Mouse ischemic stroke, SUR1-TRPM4 and NCX1 inhibition, astrocyte-specific deletion, Ca2+ imaging, AQP4 surface assays\",\n      \"pmids\": [\"37279286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NCX1 physically associates with the complex not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated functional coupling of TRPM4 to mechanosensitive Piezo1 and to TRPV4, positioning it as a shared depolarizing effector for upstream Ca2+ channels.\",\n      \"evidence\": \"siRNA, pharmacology, voltage/Ca2+ imaging in HL-1 cells and heterologous TRPV4/TRPM4 co-expression\",\n      \"pmids\": [\"38098265\", \"35432302\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction with Piezo1/TRPV4 not established\", \"Cell-line models\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified TRPM4-mediated Na+ influx and swelling as essential for ErSO-induced necrotic cancer cell death through sustained UPR hyperactivation.\",\n      \"evidence\": \"Genome-wide CRISPR screen, TRPM4 KO cells and tumor models, volume and ATP-depletion assays\",\n      \"pmids\": [\"37522838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting Na+/swelling to UPR amplification not fully defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established that age-dependent PIP2 depletion via TGF-β-driven PI3K hyperactivity impairs TRPM4 and vascular myogenic response in a Gould syndrome model.\",\n      \"evidence\": \"Patch-clamp of native SMCs from Col4a1 mutant mice, PIP2 dialysis, PI3K and TGF-β inhibitors, myogenic measurements\",\n      \"pmids\": [\"36693102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality beyond Col4a1 mutant model not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mapped the inhibitor-binding pocket (S3/S4/TRP helices and S4-S5 linker) and defined species-specific NECSO pharmacology, enabling rational modulation of necrotic cell death.\",\n      \"evidence\": \"Cryo-EM in nanodiscs ±NBA/IBA with patch-clamp validation; domain swapping and docking for NC1, with KO and GoF-mutant cell death assays\",\n      \"pmids\": [\"39828793\", \"39915626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Open-state structure with bound activators not resolved\", \"Therapeutic window for NECSO-based therapy not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRPM4's identical depolarizing activity produces opposing pro- vs anti-proliferative/invasive outcomes across tissues, and how ion flux is coupled to non-electrical signaling (β-catenin, Akt, calpain/FAK, UPR), remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying mechanism linking depolarization to the divergent transcriptional/proliferative phenotypes\", \"Open/conducting structural state and activator-bound states not yet captured\", \"Physical versus functional nature of several reported channel couplings (Piezo1, TRPV4, NCX, TRPC3) not always distinguished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [10, 18, 30, 42]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 16, 3]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [42, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 10, 17, 15]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [27]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0007165\", \"supporting_discovery_ids\": [7, 20]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 20, 10]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [18, 31, 32]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 34, 35, 8]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [29, 45, 46, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 13, 47, 19]}\n    ],\n    \"complexes\": [\n      \"SUR1-TRPM4 (NC(Ca-ATP)) channel\",\n      \"SUR1-TRPM4-AQP4 tripartite channel complex\",\n      \"TRPM4 homotetramer\",\n      \"TRPM4-NMDA receptor complex\"\n    ],\n    \"partners\": [\n      \"ABCC8 (SUR1)\",\n      \"AQP4\",\n      \"GRIN1/NMDA receptor\",\n      \"MAPRE1 (EB1)\",\n      \"MAPRE2 (EB2)\",\n      \"PRKCD (PKCδ)\",\n      \"NCX1\",\n      \"TRPV4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}