{"gene":"TRPM4","run_date":"2026-04-28T21:43:00","timeline":{"discoveries":[{"year":2002,"finding":"TRPM4b is a Ca2+-activated nonselective cation channel of 25 pS unitary conductance that conducts monovalent cations (Na+ and K+) without significant Ca2+ permeation, directly activated by intracellular Ca2+ with an apparent KD of ~400 nM, and functions to depolarize the plasma membrane thereby modulating the driving force for Ca2+ entry through other Ca2+-permeable pathways.","method":"Cloning, heterologous expression, patch-clamp electrophysiology","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — foundational reconstitution and biophysical characterization; highly cited","pmids":["12015988"],"is_preprint":false},{"year":2003,"finding":"TRPM4 exhibits intrinsic voltage-dependent gating (Boltzmann activation), with channel open probability increasing at positive potentials, producing outward rectification; this voltage dependence is not due to divalent cation block or voltage-dependent Ca2+ binding, indicating an intrinsic voltage-sensing mechanism.","method":"Whole-cell and cell-free patch-clamp electrophysiology, tail current analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous biophysical analysis in multiple patch configurations, replicated","pmids":["12799367"],"is_preprint":false},{"year":2004,"finding":"TRPM4 Ca2+ sensitivity is regulated by: (1) cytoplasmic ATP, which reverses desensitization via putative ATP-binding sites; (2) PKC-dependent phosphorylation at specific PKC phosphorylation sites that increases Ca2+ sensitivity; and (3) calmodulin binding at three C-terminal sites whose deletion strongly impairs current activation by reducing Ca2+ sensitivity and shifting voltage dependence.","method":"Mutagenesis of ATP-binding sites and PKC phosphorylation sites, calmodulin dominant-negative overexpression, patch-clamp electrophysiology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal mutagenesis and functional analyses in single study","pmids":["15590641"],"is_preprint":false},{"year":2004,"finding":"TRPM4 mediates pressure-induced smooth muscle cell depolarization and myogenic vasoconstriction of cerebral arteries; TRPM4 antisense oligodeoxynucleotide-mediated knockdown attenuates pressure-induced depolarization and myogenic constriction without affecting KCl-induced constriction.","method":"Antisense oligodeoxynucleotide knockdown, patch-clamp electrophysiology, pressure myography","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — clean KD with specific functional readout, replicated by multiple subsequent studies","pmids":["15472118"],"is_preprint":false},{"year":2006,"finding":"PIP2 is a positive modulator of TRPM4 that counteracts Ca2+ desensitization, shifts voltage dependence toward negative potentials, and increases Ca2+ sensitivity ~100-fold; the C-terminal pleckstrin homology (PH) domain mediates PIP2 action, as neutralization of basic residues in this domain accelerated desensitization and attenuated PIP2 effects; PLC-mediated PIP2 depletion potently inhibits TRPM4 currents.","method":"Inside-out and whole-cell patch-clamp, PLC-coupled receptor activation, pharmacological PIP2 depletion, site-directed mutagenesis of PH domain","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis and multiple orthogonal methods","pmids":["16424899"],"is_preprint":false},{"year":2007,"finding":"TRPM4 channels act as Ca2+-activated nonselective cation channels in mast cells that critically limit the driving force for Ca2+ influx; Trpm4-/- mast cells show more Ca2+ entry after FcεRI stimulation, augmented degranulation, and increased release of histamine, leukotrienes, and TNF, establishing TRPM4 as a negative regulator of Ca2+ entry-dependent mast cell activation.","method":"Trpm4 knockout mice, bone marrow-derived mast cell cultures, Ca2+ imaging, degranulation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple orthogonal functional readouts","pmids":["17293867"],"is_preprint":false},{"year":2007,"finding":"PKC activation increases TRPM4 Ca2+ sensitivity in vascular smooth muscle cells and promotes translocation of TRPM4 to the plasma membrane, contributing to pressure-induced depolarization and myogenic vasoconstriction; PKCδ specifically mediates TRPM4 membrane translocation.","method":"Antisense knockdown, patch-clamp electrophysiology, phorbol ester stimulation, pressure myography","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 — antisense KD with electrophysiology and functional vascular readouts, corroborated by prior studies","pmids":["17293488"],"is_preprint":false},{"year":2008,"finding":"9-Phenanthrol selectively inhibits human TRPM4 but not TRPM5 in a voltage-independent manner, with similar IC50 in whole-cell and inside-out configurations suggesting direct channel block.","method":"Whole-cell and inside-out patch-clamp in HEK293 cells stably expressing TRPM4 or TRPM5","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 — direct pharmacological characterization with concentration-response, replicated widely","pmids":["18297105"],"is_preprint":false},{"year":2009,"finding":"De novo upregulation of Trpm4 in capillaries after spinal cord injury renders cells susceptible to oncotic swelling and death following ATP depletion; in vivo Trpm4 antisense suppression or Trpm4-/- mice preserved capillary integrity, eliminated secondary hemorrhage, and reduced lesion volume.","method":"Rodent SCI models, Trpm4 antisense in vivo, Trpm4 knockout mice, COS-7 cell oncotic swelling assay","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — KO and antisense with multiple orthogonal readouts in vivo and in vitro","pmids":["19169264"],"is_preprint":false},{"year":2010,"finding":"PKCδ activity causes smooth muscle depolarization and vasoconstriction by increasing the number of TRPM4 channels in the sarcolemma; PKC activation with PMA increases cell surface TRPM4 levels ~3-fold within 10 min, and this translocation requires PKCδ but not PKCα or PKCβ.","method":"Live-cell confocal imaging with GFP-tagged TRPM4, FRAP, cell surface biotinylation, TIRF microscopy, siRNA knockdown, pressure myography","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods linking PKCδ to TRPM4 membrane trafficking and function","pmids":["20610768"],"is_preprint":false},{"year":2010,"finding":"H2O2 eliminates TRPM4 desensitization in a dose-dependent manner through oxidation of Cys1093, sustaining TRPM4 activity and causing Na+ overload-dependent necrotic cell death; TRPM4 knockdown prevents H2O2-induced necrosis but not apoptosis.","method":"Site-directed mutagenesis (Cys1093), patch-clamp, TRPM4 shRNA knockdown, cell death assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis identifies specific residue, combined with KD functional validation","pmids":["20884614"],"is_preprint":false},{"year":2010,"finding":"TRPM4 deficiency in chromaffin cells causes increased acetylcholine-induced exocytotic release events, leading to elevated plasma epinephrine and hypertension; TRPM4 normally limits catecholamine release by regulating membrane potential and Ca2+ entry driving force.","method":"Trpm4-/- mice, capacitance measurements of exocytosis in chromaffin cells, pharmacological ganglionic blockade, plasma catecholamine measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple orthogonal readouts at cellular and systemic levels","pmids":["20679729"],"is_preprint":false},{"year":2010,"finding":"Trpm4 deficiency alters Th1 and Th2 Ca2+ signaling divergently and controls nuclear localization of NFATc1; higher TRPM4 expression in Th2 cells limits Ca2+ influx and oscillations, while lower expression in Th1 cells has the opposite effect.","method":"Trpm4 knockdown, Ca2+ imaging, NFAT nuclear localization assay, cytokine production measurement","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with multiple functional readouts, single lab","pmids":["20656926"],"is_preprint":false},{"year":2011,"finding":"TRPM4 enhances cell proliferation through upregulation of β-catenin signaling; TRPM4 silencing promotes GSK-3β-dependent degradation of β-catenin and reduces β-catenin/Tcf/Lef-dependent transcription, while TRPM4 overexpression increases proliferation and β-catenin levels.","method":"TRPM4 shRNA knockdown, TRPM4 overexpression, luciferase reporter assays for β-catenin/Tcf/Lef, Western blotting","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 — KD and OE with pathway readouts, single lab","pmids":["20625999"],"is_preprint":false},{"year":2012,"finding":"SUR1 and TRPM4 co-assemble into heteromeric Sur1-Trpm4 channels in CNS injury; co-expression yields channels with biophysical properties of TRPM4 and pharmacological properties (sulfonylurea sensitivity) of SUR1; co-assembly doubles TRPM4 affinity for calmodulin and doubles Ca2+ sensitivity; Sur1-Trpm4 heteromers appear de novo after spinal cord injury.","method":"FRET, co-immunoprecipitation, patch-clamp electrophysiology, in vivo spinal cord injury model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and FRET with functional electrophysiology, multiple approaches","pmids":["23255597"],"is_preprint":false},{"year":2012,"finding":"TRPM4 mediates axonal and neuronal degeneration in inflammatory CNS lesions; TRPM4 is expressed in neuronal somata and in axons in EAE/MS lesions; TRPM4 deficiency or glibenclamide treatment reduces axonal/neuronal degeneration; electrophysiology reveals TRPM4-dependent ion influx and oncotic swelling upon excitotoxic stimulation.","method":"Trpm4-/- mice, EAE model, pharmacological inhibition, electrophysiology, in vitro excitotoxicity","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — KO plus pharmacology with multiple orthogonal readouts in vivo and in vitro","pmids":["23160238"],"is_preprint":false},{"year":2012,"finding":"TRPM4 channel controls Ca2+ signaling in monocytes/macrophages; TRPM4 deficiency impairs Ca2+ mobilization in macrophages, downregulates AKT signaling, and reduces phagocytic activity leading to bacterial overgrowth in sepsis; neutrophil Ca2+ signaling and function are unaffected by TRPM4 loss.","method":"Trpm4-/- mice, cecal ligation and puncture sepsis model, Ca2+ imaging, phagocytosis assays, AKT signaling analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple cellular and in vivo functional readouts","pmids":["22933633"],"is_preprint":false},{"year":2013,"finding":"TRPM4 is functionally present in mouse ventricular myocytes and is activated by Ca2+-induced Ca2+ release; loss of TRPM4 shortens action potential duration (APD50/APD90), increases driving force for L-type Ca2+ current, and augments β-adrenergic inotropic response in vitro and in vivo.","method":"Trpm4-/- mice, patch-clamp, membrane potential measurements, microfluorometry, pressure-volume loop analysis","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple orthogonal electrophysiological and contractility readouts","pmids":["24226423"],"is_preprint":false},{"year":2014,"finding":"TRPM4 localizes to focal adhesions and interacts with focal adhesion-related proteins; TRPM4 suppression in MEFs impairs focal adhesion turnover, FAK and Rac activities, serum-induced Ca2+ influx, and reduces cellular spreading, migration, and contractility; TRPM4 inhibition also impairs cutaneous wound healing in vivo.","method":"Mass spectrometry proteomics, immunofluorescence co-localization, TRPM4 siRNA/shRNA, FAK and Rac activity assays, Ca2+ imaging, migration assays, in vivo wound healing","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — proteomics plus KD with multiple functional readouts","pmids":["26110647"],"is_preprint":false},{"year":2014,"finding":"Negatively charged residues Asp1049 and Glu1062 in and near the TRP domain of TRPM4 C-terminal tail are required for normal Ca2+ sensitivity; mutation of these residues deteriorates Ca2+ sensitivity in the presence of Co2+ or PIP2, identifying the TRP domain as a site responsible for Ca2+ sensitivity regulation.","method":"Site-directed mutagenesis, patch-clamp electrophysiology, divalent cation application","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with electrophysiological validation","pmids":["25378404"],"is_preprint":false},{"year":2014,"finding":"TRPM4 is N-linked glycosylated at Asn992; abolishment of glycosylation by N992Q mutation decreases current density without altering plasma membrane channel number, whereas tunicamycin treatment increases TRPM4 current, suggesting glycosylation primarily modulates channel function rather than trafficking.","method":"Site-directed mutagenesis (N992Q), Western blot, surface biotinylation, patch-clamp electrophysiology, tunicamycin treatment","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 1–2 — mutagenesis plus biochemistry, but glycosylation vs. mutation effects are discordant requiring interpretation","pmids":["24605085"],"is_preprint":false},{"year":2015,"finding":"TRPM4 acts as an essential co-activator of NMDA receptors during LTP induction in CA1 hippocampal neurons; Trpm4-/- mice lack NMDAR-dependent LTP, which is rescued by facilitating NMDAR activation or post-synaptic membrane depolarization in a pairing protocol; TRPM4 generates post-synaptic depolarization in a feed-forward loop necessary for full NMDAR activation.","method":"Trpm4-/- mice, in vitro electrophysiology (LTP/LTD protocols), pairing protocol rescue","journal":"Pflugers Archiv","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with rescue experiment establishing pathway position","pmids":["26631168"],"is_preprint":false},{"year":2015,"finding":"PIP2 and PIP3 interact with the proximal N-terminal region (E733–W772) of TRPM4; R755 and R767 are important for PIP2/PIP3 binding specificity as their mutation reduces binding; PIP3-TRPM4 interaction is a novel finding.","method":"Biophysical binding assays, molecular modeling, mutagenesis of R755 and R767","journal":"Biophysical chemistry","confidence":"Medium","confidence_rationale":"Tier 3 — binding assays with mutagenesis but limited functional electrophysiological validation","pmids":["26071843"],"is_preprint":false},{"year":2015,"finding":"Selective cardiac TRPM4 deletion results in increased hypertrophic growth after chronic angiotensin II treatment; TRPM4-deficient cardiomyocytes show increased store-operated Ca2+ entry upon AngII treatment, elevated calcineurin activity and NFAT pathway activation, establishing TRPM4 as a negative regulator of calcineurin-NFAT-dependent cardiac hypertrophy.","method":"Cardiac-specific Trpm4 knockout mice, AngII treatment, Ca2+ measurements, calcineurin activity assays, gene expression","journal":"Basic research in cardiology","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with multiple cellular and molecular readouts","pmids":["26043922"],"is_preprint":false},{"year":2016,"finding":"Sur1-Trpm4 channels in TLR4-activated microglia regulate NOS2 transcription via a Ca2+-sensitive calcineurin/NFAT pathway; inhibiting or silencing Sur1 or Trpm4 paradoxically increases intracellular Ca2+, activating CaMKII phosphorylation of calcineurin, reducing NFAT nuclear translocation, and decreasing Nos2 expression and NO production.","method":"In vivo microglia, primary cultures from KO mice, co-immunoprecipitation, patch-clamp, Ca2+ imaging, chromatin immunoprecipitation, Griess assay","journal":"Journal of neuroinflammation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including ChIP, electrophysiology, KO studies","pmids":["27246103"],"is_preprint":false},{"year":2016,"finding":"The PLC inhibitor U73122 is a potent agonist of TRPM4 channels through covalent modification, directly activating TRPM4 independently of PLC, PIP2, and Ca2+; TRPM5 is insensitive while TRPM3 is inhibited, demonstrating specificity within the TRPM family.","method":"Patch-clamp electrophysiology in CHO, HEK293T, Jurkat cells with endogenous and recombinant TRPM4","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 — direct biophysical characterization across multiple cell lines","pmids":["27328745"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of full-length human TRPM4 in lipid nanodiscs at ~3 Å resolution reveals a well-defined Ca2+-binding site within the intracellular S1-S4 domain; two structures (with and without Ca2+) represent closed states; Ca2+ binding induces conformational changes that prime the channel for voltage-dependent opening.","method":"Single-particle cryo-EM in lipid nanodiscs","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structure with two states and functional interpretation","pmids":["29217581"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of mouse TRPM4 reveals three-tiered architecture; ATP binds at the N-terminal nucleotide-binding domain and inhibits channel activity; filter residue Gln973 is essential for monovalent cation selectivity; PtdIns(4,5)P2 and Ca2+-binding sites are located in the S1-S4 domain and TRP domain.","method":"Cryo-EM structure determination with and without ATP; functional validation of filter mutants","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structure with mutagenesis validating selectivity filter residue","pmids":["29211714"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of human TRPM4 bound to Ca2+ and decavanadate reveals an umbrella-like cytosolic architecture with coiled-coil pole and MHR helical ribs; two decavanadate-binding sites identified; Gln in selectivity filter is an important determinant of monovalent selectivity.","method":"Single-particle cryo-EM","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — independent high-resolution structure corroborating selectivity filter mechanism","pmids":["29211723"],"is_preprint":false},{"year":2017,"finding":"AQP4 physically co-assembles with SUR1-TRPM4 to form a tripartite SUR1-TRPM4-AQP4 heteromultimeric complex that drives fast, high-capacity water transport and astrocyte swelling; the full tripartite complex is required for cell swelling, and genetic inactivation of the SUR1-TRPM4 solute pore blocks in vivo astrocyte swelling in brain edema.","method":"Co-immunoprecipitation, FRET, calcein fluorescence cell-swelling assays in COS-7 cells, primary astrocytes, and in vivo mouse brain edema model","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and FRET plus in vitro and in vivo functional validation","pmids":["28906027"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structure of full-length human TRPM4 in apo state at 3.7 Å identifies an upper gate in the selectivity filter and a lower gate at the entrance to the cytoplasmic coiled-coil; intramolecular interactions exist between TRP domain and S4-S5 linker; 24 lipid binding sites, one pore-loop disulfide bond, and N-linked glycosylation at an extracellular site are identified; five partially hydrated Na+ ions occupy the pore.","method":"Single-particle cryo-EM","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structure providing detailed gating and ion permeation mechanism","pmids":["29463718"],"is_preprint":false},{"year":2018,"finding":"Gain-of-function mutations in the S6 transmembrane domain of TRPM4 (p.Ile1033Met, p.Ile1040Thr) cause progressive symmetric erythrokeratodermia; mutants show enhanced baseline activity, increased Ca2+ sensitivity, and elevated resting membrane potential; these substitutions affect activation gating as predicted by cryo-EM structures.","method":"Human genetic analysis, electrophysiology of mutant channels, in vitro keratinocyte overexpression studies","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1–2 — structure-guided mutagenesis with electrophysiological and cellular functional validation","pmids":["30528822"],"is_preprint":false},{"year":2018,"finding":"TRPM4 and TRPM5 are both required for taste transduction; loss of either channel significantly impairs sweet, bitter, and umami detection, and combined loss of both channels completely abolishes detection of these stimuli, placing both channels as downstream components of multiple taste signaling pathways.","method":"Trpm4-/- and double-KO mice, live cell Ca2+ imaging of taste receptor cells, behavioral taste preference assays","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with KO and double-KO establishing pathway position","pmids":["29311301"],"is_preprint":false},{"year":2018,"finding":"tPA induces PAR1-mediated, SUR1-TRPM4-dependent phasic secretion of MMP-9 from activated brain endothelial cells; tPA causes SUR1-TRPM4 channel opening via plasmin-, PAR1-, TRPC3- and Ca2+-dependent manner; inhibition of SUR1 decreases tPA-induced phasic but not tonic MMP-9 secretion.","method":"Patch-clamp electrophysiology, Ca2+ imaging, immunoblot, ELISA, zymography, genetic and pharmacological manipulations in brain endothelial cells, in vivo stroke model","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing pathway","pmids":["29617457"],"is_preprint":false},{"year":2018,"finding":"TRPM4 is expressed in soma and proximal dendrites but not the axon initial segment of mPFC pyramidal neurons; a 9-phenanthrol-sensitive current is active at resting membrane potential in soma but not distal dendrites, indicating subcellular compartment-specific TRPM4 function.","method":"Multiplex immunofluorescence labeling, perforated patch-clamp with local perfusion","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional electrophysiological consequence, single lab","pmids":["29440991"],"is_preprint":false},{"year":2018,"finding":"Deletion of Trpm4 unexpectedly reduces peak Na+ currents (Nav1.5-mediated) in cardiac myocytes, consistent with slower intraventricular conduction, suggesting TRPM4 regulates Nav1.5 function in murine cardiomyocytes.","method":"Trpm4-/- mice, perforated-patch clamp, immunoblotting, in vivo and Langendorff ECG","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — KO with electrophysiology, but mechanism of TRPM4–Nav1.5 interaction not fully resolved, single lab","pmids":["33810249"],"is_preprint":false},{"year":2020,"finding":"NMDAR-mediated excitotoxicity requires physical coupling of NMDARs to TRPM4 via intracellular near-membrane domains; disruption of the NMDAR/TRPM4 interaction interface by small molecules spares NMDAR-induced Ca2+ signaling but blocks excitotoxicity, mitochondrial dysfunction, and CREB shutoff, and reduces neuronal loss in stroke and retinal degeneration models.","method":"Co-immunoprecipitation, structure-based computational drug screening, small molecule interface inhibitors, mouse models of stroke and retinal degeneration","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — Co-IP establishing complex plus structure-based drug design with multiple functional validations in vivo","pmids":["33033186"],"is_preprint":false},{"year":2021,"finding":"Selective deletion of TRPM4 in cardiomyocytes results in ~50% reduction in LVH induced by transverse aortic constriction, identifying TRPM4 as a component of the mechanosensory signaling pathway that induces pressure overload-dependent hypertrophy.","method":"Cardiomyocyte-specific Trpm4 knockout mice, transverse aortic constriction, cardiac morphometry and function","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with clean functional readout","pmids":["34190686"],"is_preprint":false},{"year":2021,"finding":"NO/cGMP/PKG signaling causes vasodilation by inhibiting TRPM4 channels in smooth muscle cells via IRAG; phosphorylation of IRAG by PKG inhibits IP3R-mediated Ca2+ release from the SR, thereby blocking Ca2+-dependent TRPM4 activation; IRAG, PKG, and IP3Rs form a nanoscale signaling complex on the SR.","method":"Patch-clamp electrophysiology, superresolution microscopy, IRAG knockdown, pharmacological inhibition of PKG/sGC","journal":"Function (Oxford, England)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including KD, pharmacology, superresolution imaging","pmids":["34734188"],"is_preprint":false},{"year":2022,"finding":"TRPM4 contributes to a long-lasting Ca2+ overload-induced background current regulating cardiomyocyte excitability; Trpm4-/- mice show reduced Ca2+-dependent triggered arrhythmias; meclofenamate is identified as a potent TRPM4 antagonist that suppresses catecholaminergic polymorphic ventricular tachycardia-associated arrhythmias in a TRPM4-dependent manner.","method":"Trpm4-/- mice, patch-clamp, in vivo telemetric ECG, compound screening, drug validation","journal":"European heart journal","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple electrophysiological and in vivo readouts plus pharmacological validation","pmids":["35822895"],"is_preprint":false},{"year":2022,"finding":"SUR1-TRPM4 activation in microglia triggers K+ efflux via Na+ influx-driven opening of K+ channels, which activates NLRP3 inflammasome; this process requires P2X7 receptor-mediated Ca2+ influx to activate SUR1-TRPM4; GLB or 9-phenanthrol block this pathway.","method":"In vivo rat cardiac arrest model, BV2 microglial cells, siRNA knockdown, pharmacological inhibition, inflammasome assays","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple approaches but complex signaling cascade interpretation, single lab","pmids":["35972671"],"is_preprint":false},{"year":2023,"finding":"Na+ influx through SUR1-TRPM4 in perivascular astrocyte endfeet induces Ca2+ transport via NCX1 in reverse mode, raising intra-endfoot Ca2+, which stimulates calmodulin-dependent translocation of AQP4 to the plasma membrane and water influx causing brain swelling after ischemic stroke.","method":"Mouse ischemic stroke model, pharmacological inhibition, astrocyte-specific KO of SUR1-TRPM4, Ca2+ imaging, AQP4 surface localization assays","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific KO with multiple mechanistic readouts establishing pathway","pmids":["37279286"],"is_preprint":false},{"year":2023,"finding":"A genome-wide CRISPR screen identifies TRPM4 as essential for necrosis-inducing anticancer therapy; TRPM4-mediated Na+ influx and cell swelling sustains lethal unfolded protein response (a-UPR) hyperactivation; TRPM4 knockout abolishes therapy-induced tumor regression in vivo and blocks immunogenic cell death signals.","method":"Genome-wide CRISPR-Cas9 screen, TRPM4 KO, in vivo tumor models, UPR assays, cell volume measurements, ATP depletion assays, macrophage activation assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — genome-wide screen plus KO with multiple orthogonal validations in vitro and in vivo","pmids":["37522838"],"is_preprint":false},{"year":2025,"finding":"Persistent TRPM4 activation by compound NC1 induces necrotic cell death through Na+ overload (NECSO); NC1 specifically activates human but not mouse TRPM4 due to differences in a transmembrane region identified by domain swapping and molecular docking; gain-of-function cardiac arrhythmia mutations in TRPM4 increase vulnerability to NECSO.","method":"Domain swapping, molecular docking, TRPM4-deficient cells, electrophysiology, cell death assays, chemical screening","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 — domain swapping and mutagenesis with functional validation identifies transmembrane determinants of species specificity","pmids":["39915626"],"is_preprint":false},{"year":2016,"finding":"TRPM4 is a functional tetramer in detergent micelles and can be reconstituted into liposomes as a functional channel; single-channel recordings from proteoliposomes show inhibition by flufenamic acid.","method":"Crosslinking, native gel electrophoresis, multi-angle laser light scattering, electron microscopy, electrophysiology of proteoliposomes","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of purified channel in liposomes with functional validation","pmids":["26785754"],"is_preprint":false},{"year":2023,"finding":"Piezo1 activation functionally couples to TRPM4 in atrial myocyte-like cells; Yoda1-induced Piezo1 activation changes action potential frequency, and this effect is significantly reduced by TRPM4 knockdown or pharmacological inhibition, demonstrating a Piezo1→Ca2+→TRPM4 signaling axis in cardiomyocytes.","method":"siRNA knockdown, pharmacological inhibition, fluorescent voltage-sensitive dye action potential recording in HL-1 cells","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 — KD and pharmacology with functional readout, single lab, in vitro model","pmids":["38098265"],"is_preprint":false},{"year":2022,"finding":"p53 represses TRPM4 expression by acting on the TRPM4 promoter; loss of p53 or p63γ increases TRPM4 promoter activity, mRNA, protein, and Na+ currents; p53-mediated TRPM4 suppression increases store-operated Ca2+ entry and alters cell cycle distribution.","method":"CRISPR-Cas9 TRPM4 KO, p53 overexpression, promoter reporter assays, patch-clamp, Ca2+ imaging","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 — promoter reporter plus KO with functional readouts, single lab","pmids":["35500522"],"is_preprint":false},{"year":2018,"finding":"TRPM4 inhibition in CA1 neurons and hippocampus contributes to synaptic plasticity; in Trpm4-/- rats, TRPM4 deletion impairs hippocampus-dependent spatial working and reference memory and affects LTP kinetics, with enhanced initial BOLD fMRI response in the stimulated hippocampus.","method":"Trpm4-/- rats, chronic in vivo electrophysiology, behavioral testing (Barnes maze, T-maze, Morris water maze), fMRI","journal":"Brain structure & function","confidence":"Medium","confidence_rationale":"Tier 2 — KO with electrophysiology, behavior, and imaging, single lab","pmids":["29571504"],"is_preprint":false}],"current_model":"TRPM4 is a Ca2+-activated, voltage-dependent, monovalent-selective (Na+/K+) cation channel that depolarizes the plasma membrane to regulate Ca2+ entry driving force; it is positively modulated by PIP2, PKC phosphorylation, and calmodulin binding at its C-terminus, negatively regulated by ATP (which binds the N-terminal nucleotide-binding domain) and by the NO/cGMP/PKG/IRAG/IP3R signaling axis; structurally it forms a homotetramer with a defined Ca2+-binding site in the S1-S4 domain and a selectivity filter glutamine (Q973/Q in mouse) determining monovalent selectivity; it can co-assemble with SUR1 to form pharmacologically distinct SUR1-TRPM4 heteromers, and physically couples with NMDARs via intracellular near-membrane domains, with focal adhesion proteins, and with Piezo1 in cardiomyocytes; its diverse physiological roles—including myogenic vasoconstriction, mast cell degranulation, cardiac action potential shaping, hippocampal LTP, taste transduction, and inflammatory gene regulation—all stem from its core function of translating intracellular Ca2+ rises into membrane depolarization that feeds back on Ca2+ entry and downstream Ca2+-dependent signaling pathways."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing that TRPM4b is a Ca²⁺-activated channel selective for monovalent cations resolved the molecular identity of an endogenous depolarizing conductance that modulates Ca²⁺ entry driving force without itself conducting Ca²⁺.","evidence":"Cloning, heterologous expression, and patch-clamp electrophysiology in transfected cells","pmids":["12015988"],"confidence":"High","gaps":["Structural basis for monovalent selectivity unknown","In vivo physiological role not yet demonstrated"]},{"year":2003,"claim":"Demonstrating intrinsic voltage-dependent gating independent of divalent block established that TRPM4 integrates both Ca²⁺ and voltage signals, explaining its outward rectification.","evidence":"Whole-cell and cell-free patch-clamp with Boltzmann analysis and tail currents","pmids":["12799367"],"confidence":"High","gaps":["Molecular identity of the voltage sensor unknown","Coupling between Ca²⁺ binding and voltage gating unresolved"]},{"year":2004,"claim":"Identifying ATP, PKC phosphorylation, and calmodulin as modulators of TRPM4 Ca²⁺ sensitivity established a multi-input regulatory framework that controls channel activity under physiological conditions, while simultaneous demonstration of TRPM4's role in myogenic vasoconstriction provided the first native physiological function.","evidence":"Mutagenesis of ATP-binding/PKC/calmodulin sites with patch-clamp; antisense knockdown in cerebral arteries with pressure myography","pmids":["15590641","15472118"],"confidence":"High","gaps":["Direct binding sites for ATP not structurally resolved","Identity of calmodulin binding mode at C-terminal sites not confirmed structurally"]},{"year":2006,"claim":"Establishing PIP₂ as a major positive modulator that shifts TRPM4 voltage dependence and increases Ca²⁺ sensitivity ~100-fold, acting through a C-terminal PH domain, revealed how membrane phosphoinositide metabolism tunes channel activity.","evidence":"Inside-out and whole-cell patch-clamp with PIP₂ application, PLC activation, and PH-domain mutagenesis","pmids":["16424899"],"confidence":"High","gaps":["Structural basis for PIP₂ binding not resolved at atomic level","Relative contributions of PIP₂ vs PIP₃ not clarified"]},{"year":2007,"claim":"Trpm4 knockout mice revealed that TRPM4 is a negative regulator of Ca²⁺-dependent mast cell degranulation and that PKCδ drives TRPM4 membrane translocation in smooth muscle, establishing cell-type-specific roles for TRPM4 in immune and vascular contexts.","evidence":"Trpm4⁻/⁻ bone marrow-derived mast cells with degranulation assays; antisense/siRNA knockdown with surface biotinylation and pressure myography in smooth muscle","pmids":["17293867","17293488"],"confidence":"High","gaps":["Trafficking mechanism for PKCδ-dependent TRPM4 insertion not molecularly defined","Whether TRPM4 regulates other immune cell types beyond mast cells not established"]},{"year":2009,"claim":"De novo TRPM4 upregulation after spinal cord injury drives oncotic capillary cell death and secondary hemorrhage, establishing TRPM4 as a pathological effector of Na⁺ overload-induced necrosis in CNS injury.","evidence":"Trpm4⁻/⁻ mice and in vivo antisense in rodent SCI models with capillary integrity and lesion volume readouts","pmids":["19169264"],"confidence":"High","gaps":["Transcriptional mechanism of TRPM4 upregulation after injury not defined","Whether SUR1 co-assembly is required for pathological function not yet tested"]},{"year":2010,"claim":"Multiple studies established TRPM4 as a broad regulator of excitable and secretory cell physiology: it shapes catecholamine secretion from chromaffin cells, controls T helper cell Ca²⁺ signaling and NFAT localization, and is sensitized by H₂O₂ oxidation of Cys1093 to drive Na⁺ overload-dependent necrosis.","evidence":"Trpm4⁻/⁻ chromaffin cells with capacitance measurements; Trpm4 knockdown with Ca²⁺ imaging and NFAT assays in T cells; Cys1093 mutagenesis with patch-clamp and cell death assays","pmids":["20679729","20656926","20884614"],"confidence":"High","gaps":["Structural basis for Cys1093 oxidation-dependent desensitization removal unknown","Mechanism linking TRPM4 to NFAT nuclear localization in T cells is indirect"]},{"year":2012,"claim":"Discovery that SUR1 and TRPM4 co-assemble into heteromeric channels with doubled Ca²⁺ sensitivity and sulfonylurea responsiveness, appearing de novo after CNS injury, established a pharmacologically targetable pathological channel complex distinct from TRPM4 homomers.","evidence":"Co-immunoprecipitation, FRET, and patch-clamp in heterologous expression; in vivo SCI and EAE models with Trpm4⁻/⁻ mice","pmids":["23255597","23160238"],"confidence":"High","gaps":["Structural basis for SUR1-TRPM4 co-assembly not resolved","Stoichiometry of SUR1:TRPM4 subunits in the heteromer unknown"]},{"year":2013,"claim":"Demonstrating that TRPM4 shapes ventricular action potential duration and β-adrenergic inotropy established its functional role in the cardiac conduction and contractility system.","evidence":"Trpm4⁻/⁻ mice with patch-clamp, pressure-volume loops, and membrane potential measurements","pmids":["24226423"],"confidence":"High","gaps":["Relative contribution of TRPM4 vs TRPM5 in cardiac AP not dissected","Subcellular targeting mechanism in cardiomyocytes not defined"]},{"year":2015,"claim":"TRPM4 was identified as an essential co-activator of NMDARs during hippocampal LTP, generating a feed-forward depolarization necessary for full NMDAR activation, while cardiac-specific deletion revealed TRPM4 as a negative regulator of calcineurin-NFAT hypertrophic signaling.","evidence":"Trpm4⁻/⁻ mice with LTP/LTD electrophysiology and pairing-protocol rescue; cardiac-specific Trpm4 KO with AngII treatment and calcineurin assays","pmids":["26631168","26043922"],"confidence":"High","gaps":["Physical basis for TRPM4-NMDAR functional coupling not yet demonstrated","Whether TRPM4-dependent LTP operates in brain regions beyond CA1 unknown"]},{"year":2017,"claim":"Cryo-EM structures at ~3 Å resolution defined the homotetrameric architecture, identified the Ca²⁺-binding site in the S1–S4 domain, the ATP-binding nucleotide-binding domain, and the selectivity filter glutamine responsible for monovalent selectivity, providing an atomic framework for decades of functional data.","evidence":"Single-particle cryo-EM of human and mouse TRPM4 in lipid nanodiscs/detergent with and without Ca²⁺/ATP; mutagenesis validation of filter residue","pmids":["29217581","29211714","29211723"],"confidence":"High","gaps":["Open-state structure not captured","PIP₂-bound structure not available at high resolution","Conformational transition pathway from Ca²⁺-primed to voltage-activated state unresolved"]},{"year":2018,"claim":"Multiple discoveries expanded TRPM4's physiological scope: it cooperates with TRPM5 for sweet/bitter/umami taste transduction, contributes to SUR1-TRPM4-AQP4 tripartite complex-driven brain edema, and gain-of-function S6 domain mutations cause progressive symmetric erythrokeratodermia.","evidence":"Trpm4⁻/⁻ and double-KO mice with taste behavioral assays; co-IP/FRET of SUR1-TRPM4-AQP4 with in vivo edema models; human genetics with mutant channel electrophysiology","pmids":["29311301","28906027","30528822"],"confidence":"High","gaps":["How TRPM4 and TRPM5 divide labor in taste cells not molecularly resolved","Structural basis for gain-of-function erythrokeratodermia mutations at the gate not fully modeled"]},{"year":2020,"claim":"Establishing that NMDARs physically couple to TRPM4 via intracellular near-membrane domains, and that disrupting this interface blocks excitotoxicity while preserving NMDAR Ca²⁺ signaling, provided a druggable mechanism separating physiological from pathological NMDAR function.","evidence":"Co-immunoprecipitation, structure-based computational screening, small molecule interface disruptors validated in stroke and retinal degeneration mouse models","pmids":["33033186"],"confidence":"High","gaps":["Exact binding interface residues on TRPM4 side not mapped","Whether NMDAR-TRPM4 coupling exists in all neuronal subtypes unknown"]},{"year":2021,"claim":"Identification of NO/cGMP/PKG/IRAG/IP₃R as an upstream inhibitory axis for TRPM4 in smooth muscle connected canonical vasodilatory signaling directly to TRPM4 channel gating, while cardiomyocyte-specific deletion showed TRPM4 contributes to pressure overload-induced hypertrophy.","evidence":"Patch-clamp with superresolution microscopy and IRAG knockdown; cardiomyocyte-specific Trpm4 KO with transverse aortic constriction","pmids":["34734188","34190686"],"confidence":"High","gaps":["Whether IRAG-IP₃R complex acts as a direct TRPM4 regulatory scaffold is unknown","Downstream effectors linking TRPM4-mediated depolarization to hypertrophic gene expression not fully defined"]},{"year":2022,"claim":"TRPM4 contributes to arrhythmogenic triggered activity via Ca²⁺ overload-induced background current, and meclofenamate was identified as a TRPM4 antagonist that suppresses arrhythmias in a TRPM4-dependent manner, opening a therapeutic avenue for CPVT.","evidence":"Trpm4⁻/⁻ mice with telemetric ECG, patch-clamp, and compound screening with pharmacological validation","pmids":["35822895"],"confidence":"High","gaps":["Meclofenamate binding site on TRPM4 unknown","Selectivity of meclofenamate across TRP channels not fully characterized"]},{"year":2023,"claim":"A genome-wide CRISPR screen identified TRPM4 as essential for necrosis-inducing anticancer therapy by sustaining lethal UPR hyperactivation through Na⁺ influx-driven cell swelling, while astrocytic SUR1-TRPM4/NCX1/AQP4 signaling was shown to drive post-ischemic brain edema via reverse-mode NCX1 Ca²⁺ entry.","evidence":"CRISPR screen with TRPM4 KO in tumor models; astrocyte-specific SUR1-TRPM4 KO in ischemic stroke model with Ca²⁺ imaging and AQP4 translocation assays","pmids":["37522838","37279286"],"confidence":"High","gaps":["Whether TRPM4 function in immunogenic cell death is generalizable across cancer types unknown","Calmodulin-dependent AQP4 translocation mechanism downstream of TRPM4-NCX1 not structurally resolved"]},{"year":2025,"claim":"Species-specific TRPM4 activation by compound NC1 induces necrotic cell death through sustained Na⁺ overload (NECSO), with domain-swapping experiments mapping species selectivity to a transmembrane region and cardiac gain-of-function mutations increasing NECSO vulnerability.","evidence":"Domain swapping between human and mouse TRPM4, molecular docking, electrophysiology, and cell death assays","pmids":["39915626"],"confidence":"High","gaps":["Exact NC1 binding pocket not resolved crystallographically","Whether NECSO pathway is relevant to human cardiac arrhythmia pathology in vivo unknown"]},{"year":null,"claim":"Key unresolved questions include the structural basis of the open/conducting state and the voltage-gating conformational transition, the stoichiometry and atomic structure of SUR1-TRPM4 heteromers, identification of all post-translational modifications controlling trafficking and gating in vivo, and whether TRPM4-targeted therapeutics can be developed with sufficient selectivity for clinical translation.","evidence":"","pmids":[],"confidence":"High","gaps":["No open-state cryo-EM structure available","SUR1-TRPM4 heteromer stoichiometry and structure unresolved","Comprehensive in vivo post-translational modification map lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,26,27,30]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[4,22]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[1,10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,9,18,34]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,26,27,30]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,12,23,38]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,16,40]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[21,36,47]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[17,39]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,15,31]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[32]}],"complexes":["SUR1-TRPM4","SUR1-TRPM4-AQP4","TRPM4 homotetramer"],"partners":["ABCC8","AQP4","GRIN1","PIEZO1","CALM1","PRKCD"],"other_free_text":[]},"mechanistic_narrative":"TRPM4 is a Ca²⁺-activated, voltage-dependent, monovalent cation-selective channel that depolarizes the plasma membrane to regulate Ca²⁺ entry driving force across diverse cell types, thereby shaping immune cell activation, vascular tone, cardiac action potentials, synaptic plasticity, and taste transduction. The channel is directly activated by intracellular Ca²⁺ (~400 nM KD), exhibits intrinsic voltage-dependent gating, and its Ca²⁺ sensitivity is positively modulated by PIP₂ binding at C-terminal and proximal N-terminal domains, PKC phosphorylation (particularly PKCδ-dependent membrane translocation), and calmodulin binding, while ATP binding at the N-terminal nucleotide-binding domain and the NO/cGMP/PKG/IRAG/IP₃R axis negatively regulate channel activity [PMID:12015988, PMID:12799367, PMID:15590641, PMID:16424899, PMID:34734188]. Cryo-EM structures reveal a homotetrameric architecture with a Ca²⁺-binding site in the intracellular S1–S4 domain, a selectivity filter glutamine essential for monovalent selectivity, dual gates, and an ATP-binding nucleotide-binding domain [PMID:29217581, PMID:29211714, PMID:29211723]. TRPM4 co-assembles with SUR1 to form SUR1-TRPM4 heteromers with enhanced Ca²⁺ sensitivity and sulfonylurea responsiveness that drive pathological cell swelling and inflammatory signaling in CNS injury, and physically couples with NMDARs through intracellular near-membrane domains to mediate excitotoxic neuronal death [PMID:23255597, PMID:33033186, PMID:37279286]."},"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; TRPM5","url":"https://www.omim.org/entry/604600"},{"mim_id":"604559","title":"PROGRESSIVE FAMILIAL HEART BLOCK, TYPE IB; PFHB1B","url":"https://www.omim.org/entry/604559"},{"mim_id":"138253","title":"GLUTAMATE RECEPTOR, IONOTROPIC, N-METHYL-D-ASPARTATE, SUBUNIT 2A; GRIN2A","url":"https://www.omim.org/entry/138253"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRPM4"},"hgnc":{"alias_symbol":["FLJ20041"],"prev_symbol":[]},"alphafold":{"accession":"Q8TD43","domains":[{"cath_id":"-","chopping":"392-455","consensus_level":"medium","plddt":84.937,"start":392,"end":455},{"cath_id":"-","chopping":"465-481_503-520_552-681","consensus_level":"high","plddt":87.5248,"start":465,"end":681},{"cath_id":"-","chopping":"913-990_1012-1093_1106-1112","consensus_level":"medium","plddt":81.3979,"start":913,"end":1112}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TD43","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TD43-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TD43-F1-predicted_aligned_error_v6.png","plddt_mean":77.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRPM4","jax_strain_url":"https://www.jax.org/strain/search?query=TRPM4"},"sequence":{"accession":"Q8TD43","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TD43.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TD43/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TD43"}},"corpus_meta":[{"pmid":"12015988","id":"PMC_12015988","title":"TRPM4 is a Ca2+-activated nonselective cation channel mediating cell membrane depolarization.","date":"2002","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/12015988","citation_count":594,"is_preprint":false},{"pmid":"15472118","id":"PMC_15472118","title":"Critical role for transient receptor potential channel TRPM4 in myogenic constriction of cerebral arteries.","date":"2004","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/15472118","citation_count":312,"is_preprint":false},{"pmid":"12799367","id":"PMC_12799367","title":"Voltage dependence of the Ca2+-activated cation channel TRPM4.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12799367","citation_count":292,"is_preprint":false},{"pmid":"16424899","id":"PMC_16424899","title":"The Ca2+-activated cation channel TRPM4 is regulated by phosphatidylinositol 4,5-biphosphate.","date":"2006","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/16424899","citation_count":256,"is_preprint":false},{"pmid":"15590641","id":"PMC_15590641","title":"Regulation of the Ca2+ sensitivity of the nonselective cation channel TRPM4.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15590641","citation_count":237,"is_preprint":false},{"pmid":"17293867","id":"PMC_17293867","title":"Increased IgE-dependent mast cell activation and anaphylactic responses in mice lacking the calcium-activated nonselective cation channel TRPM4.","date":"2007","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17293867","citation_count":222,"is_preprint":false},{"pmid":"29217581","id":"PMC_29217581","title":"Structure of the human TRPM4 ion channel in a lipid nanodisc.","date":"2017","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/29217581","citation_count":208,"is_preprint":false},{"pmid":"19169264","id":"PMC_19169264","title":"De novo expression of Trpm4 initiates secondary hemorrhage in spinal cord injury.","date":"2009","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19169264","citation_count":176,"is_preprint":false},{"pmid":"23160238","id":"PMC_23160238","title":"TRPM4 cation channel mediates axonal and neuronal degeneration in experimental autoimmune encephalomyelitis and multiple sclerosis.","date":"2012","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/23160238","citation_count":169,"is_preprint":false},{"pmid":"29211714","id":"PMC_29211714","title":"Structures of the calcium-activated, non-selective cation channel TRPM4.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/29211714","citation_count":159,"is_preprint":false},{"pmid":"23255597","id":"PMC_23255597","title":"The sulfonylurea receptor 1 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cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/33205255","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50924,"output_tokens":10754,"usd":0.157041},"stage2":{"model":"claude-opus-4-6","input_tokens":14836,"output_tokens":4723,"usd":0.288382},"total_usd":0.445423,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"TRPM4b is a Ca2+-activated nonselective cation channel of 25 pS unitary conductance that conducts monovalent cations (Na+ and K+) without significant Ca2+ permeation, directly activated by intracellular Ca2+ with an apparent KD of ~400 nM, and functions to depolarize the plasma membrane thereby modulating the driving force for Ca2+ entry through other Ca2+-permeable pathways.\",\n      \"method\": \"Cloning, heterologous expression, patch-clamp electrophysiology\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — foundational reconstitution and biophysical characterization; highly cited\",\n      \"pmids\": [\"12015988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TRPM4 exhibits intrinsic voltage-dependent gating (Boltzmann activation), with channel open probability increasing at positive potentials, producing outward rectification; this voltage dependence is not due to divalent cation block or voltage-dependent Ca2+ binding, indicating an intrinsic voltage-sensing mechanism.\",\n      \"method\": \"Whole-cell and cell-free patch-clamp electrophysiology, tail current analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous biophysical analysis in multiple patch configurations, replicated\",\n      \"pmids\": [\"12799367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRPM4 Ca2+ sensitivity is regulated by: (1) cytoplasmic ATP, which reverses desensitization via putative ATP-binding sites; (2) PKC-dependent phosphorylation at specific PKC phosphorylation sites that increases Ca2+ sensitivity; and (3) calmodulin binding at three C-terminal sites whose deletion strongly impairs current activation by reducing Ca2+ sensitivity and shifting voltage dependence.\",\n      \"method\": \"Mutagenesis of ATP-binding sites and PKC phosphorylation sites, calmodulin dominant-negative overexpression, patch-clamp electrophysiology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal mutagenesis and functional analyses in single study\",\n      \"pmids\": [\"15590641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRPM4 mediates pressure-induced smooth muscle cell depolarization and myogenic vasoconstriction of cerebral arteries; TRPM4 antisense oligodeoxynucleotide-mediated knockdown attenuates pressure-induced depolarization and myogenic constriction without affecting KCl-induced constriction.\",\n      \"method\": \"Antisense oligodeoxynucleotide knockdown, patch-clamp electrophysiology, pressure myography\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with specific functional readout, replicated by multiple subsequent studies\",\n      \"pmids\": [\"15472118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PIP2 is a positive modulator of TRPM4 that counteracts Ca2+ desensitization, shifts voltage dependence toward negative potentials, and increases Ca2+ sensitivity ~100-fold; the C-terminal pleckstrin homology (PH) domain mediates PIP2 action, as neutralization of basic residues in this domain accelerated desensitization and attenuated PIP2 effects; PLC-mediated PIP2 depletion potently inhibits TRPM4 currents.\",\n      \"method\": \"Inside-out and whole-cell patch-clamp, PLC-coupled receptor activation, pharmacological PIP2 depletion, site-directed mutagenesis of PH domain\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis and multiple orthogonal methods\",\n      \"pmids\": [\"16424899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TRPM4 channels act as Ca2+-activated nonselective cation channels in mast cells that critically limit the driving force for Ca2+ influx; Trpm4-/- mast cells show more Ca2+ entry after FcεRI stimulation, augmented degranulation, and increased release of histamine, leukotrienes, and TNF, establishing TRPM4 as a negative regulator of Ca2+ entry-dependent mast cell activation.\",\n      \"method\": \"Trpm4 knockout mice, bone marrow-derived mast cell cultures, Ca2+ imaging, degranulation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple orthogonal functional readouts\",\n      \"pmids\": [\"17293867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PKC activation increases TRPM4 Ca2+ sensitivity in vascular smooth muscle cells and promotes translocation of TRPM4 to the plasma membrane, contributing to pressure-induced depolarization and myogenic vasoconstriction; PKCδ specifically mediates TRPM4 membrane translocation.\",\n      \"method\": \"Antisense knockdown, patch-clamp electrophysiology, phorbol ester stimulation, pressure myography\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — antisense KD with electrophysiology and functional vascular readouts, corroborated by prior studies\",\n      \"pmids\": [\"17293488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"9-Phenanthrol selectively inhibits human TRPM4 but not TRPM5 in a voltage-independent manner, with similar IC50 in whole-cell and inside-out configurations suggesting direct channel block.\",\n      \"method\": \"Whole-cell and inside-out patch-clamp in HEK293 cells stably expressing TRPM4 or TRPM5\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct pharmacological characterization with concentration-response, replicated widely\",\n      \"pmids\": [\"18297105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"De novo upregulation of Trpm4 in capillaries after spinal cord injury renders cells susceptible to oncotic swelling and death following ATP depletion; in vivo Trpm4 antisense suppression or Trpm4-/- mice preserved capillary integrity, eliminated secondary hemorrhage, and reduced lesion volume.\",\n      \"method\": \"Rodent SCI models, Trpm4 antisense in vivo, Trpm4 knockout mice, COS-7 cell oncotic swelling assay\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO and antisense with multiple orthogonal readouts in vivo and in vitro\",\n      \"pmids\": [\"19169264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PKCδ activity causes smooth muscle depolarization and vasoconstriction by increasing the number of TRPM4 channels in the sarcolemma; PKC activation with PMA increases cell surface TRPM4 levels ~3-fold within 10 min, and this translocation requires PKCδ but not PKCα or PKCβ.\",\n      \"method\": \"Live-cell confocal imaging with GFP-tagged TRPM4, FRAP, cell surface biotinylation, TIRF microscopy, siRNA knockdown, pressure myography\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods linking PKCδ to TRPM4 membrane trafficking and function\",\n      \"pmids\": [\"20610768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"H2O2 eliminates TRPM4 desensitization in a dose-dependent manner through oxidation of Cys1093, sustaining TRPM4 activity and causing Na+ overload-dependent necrotic cell death; TRPM4 knockdown prevents H2O2-induced necrosis but not apoptosis.\",\n      \"method\": \"Site-directed mutagenesis (Cys1093), patch-clamp, TRPM4 shRNA knockdown, cell death assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis identifies specific residue, combined with KD functional validation\",\n      \"pmids\": [\"20884614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRPM4 deficiency in chromaffin cells causes increased acetylcholine-induced exocytotic release events, leading to elevated plasma epinephrine and hypertension; TRPM4 normally limits catecholamine release by regulating membrane potential and Ca2+ entry driving force.\",\n      \"method\": \"Trpm4-/- mice, capacitance measurements of exocytosis in chromaffin cells, pharmacological ganglionic blockade, plasma catecholamine measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple orthogonal readouts at cellular and systemic levels\",\n      \"pmids\": [\"20679729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Trpm4 deficiency alters Th1 and Th2 Ca2+ signaling divergently and controls nuclear localization of NFATc1; higher TRPM4 expression in Th2 cells limits Ca2+ influx and oscillations, while lower expression in Th1 cells has the opposite effect.\",\n      \"method\": \"Trpm4 knockdown, Ca2+ imaging, NFAT nuclear localization assay, cytokine production measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with multiple functional readouts, single lab\",\n      \"pmids\": [\"20656926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRPM4 enhances cell proliferation through upregulation of β-catenin signaling; TRPM4 silencing promotes GSK-3β-dependent degradation of β-catenin and reduces β-catenin/Tcf/Lef-dependent transcription, while TRPM4 overexpression increases proliferation and β-catenin levels.\",\n      \"method\": \"TRPM4 shRNA knockdown, TRPM4 overexpression, luciferase reporter assays for β-catenin/Tcf/Lef, Western blotting\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD and OE with pathway readouts, single lab\",\n      \"pmids\": [\"20625999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SUR1 and TRPM4 co-assemble into heteromeric Sur1-Trpm4 channels in CNS injury; co-expression yields channels with biophysical properties of TRPM4 and pharmacological properties (sulfonylurea sensitivity) of SUR1; co-assembly doubles TRPM4 affinity for calmodulin and doubles Ca2+ sensitivity; Sur1-Trpm4 heteromers appear de novo after spinal cord injury.\",\n      \"method\": \"FRET, co-immunoprecipitation, patch-clamp electrophysiology, in vivo spinal cord injury model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and FRET with functional electrophysiology, multiple approaches\",\n      \"pmids\": [\"23255597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPM4 mediates axonal and neuronal degeneration in inflammatory CNS lesions; TRPM4 is expressed in neuronal somata and in axons in EAE/MS lesions; TRPM4 deficiency or glibenclamide treatment reduces axonal/neuronal degeneration; electrophysiology reveals TRPM4-dependent ion influx and oncotic swelling upon excitotoxic stimulation.\",\n      \"method\": \"Trpm4-/- mice, EAE model, pharmacological inhibition, electrophysiology, in vitro excitotoxicity\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO plus pharmacology with multiple orthogonal readouts in vivo and in vitro\",\n      \"pmids\": [\"23160238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRPM4 channel controls Ca2+ signaling in monocytes/macrophages; TRPM4 deficiency impairs Ca2+ mobilization in macrophages, downregulates AKT signaling, and reduces phagocytic activity leading to bacterial overgrowth in sepsis; neutrophil Ca2+ signaling and function are unaffected by TRPM4 loss.\",\n      \"method\": \"Trpm4-/- mice, cecal ligation and puncture sepsis model, Ca2+ imaging, phagocytosis assays, AKT signaling analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple cellular and in vivo functional readouts\",\n      \"pmids\": [\"22933633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRPM4 is functionally present in mouse ventricular myocytes and is activated by Ca2+-induced Ca2+ release; loss of TRPM4 shortens action potential duration (APD50/APD90), increases driving force for L-type Ca2+ current, and augments β-adrenergic inotropic response in vitro and in vivo.\",\n      \"method\": \"Trpm4-/- mice, patch-clamp, membrane potential measurements, microfluorometry, pressure-volume loop analysis\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple orthogonal electrophysiological and contractility readouts\",\n      \"pmids\": [\"24226423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRPM4 localizes to focal adhesions and interacts with focal adhesion-related proteins; TRPM4 suppression in MEFs impairs focal adhesion turnover, FAK and Rac activities, serum-induced Ca2+ influx, and reduces cellular spreading, migration, and contractility; TRPM4 inhibition also impairs cutaneous wound healing in vivo.\",\n      \"method\": \"Mass spectrometry proteomics, immunofluorescence co-localization, TRPM4 siRNA/shRNA, FAK and Rac activity assays, Ca2+ imaging, migration assays, in vivo wound healing\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics plus KD with multiple functional readouts\",\n      \"pmids\": [\"26110647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Negatively charged residues Asp1049 and Glu1062 in and near the TRP domain of TRPM4 C-terminal tail are required for normal Ca2+ sensitivity; mutation of these residues deteriorates Ca2+ sensitivity in the presence of Co2+ or PIP2, identifying the TRP domain as a site responsible for Ca2+ sensitivity regulation.\",\n      \"method\": \"Site-directed mutagenesis, patch-clamp electrophysiology, divalent cation application\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with electrophysiological validation\",\n      \"pmids\": [\"25378404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRPM4 is N-linked glycosylated at Asn992; abolishment of glycosylation by N992Q mutation decreases current density without altering plasma membrane channel number, whereas tunicamycin treatment increases TRPM4 current, suggesting glycosylation primarily modulates channel function rather than trafficking.\",\n      \"method\": \"Site-directed mutagenesis (N992Q), Western blot, surface biotinylation, patch-clamp electrophysiology, tunicamycin treatment\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis plus biochemistry, but glycosylation vs. mutation effects are discordant requiring interpretation\",\n      \"pmids\": [\"24605085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRPM4 acts as an essential co-activator of NMDA receptors during LTP induction in CA1 hippocampal neurons; Trpm4-/- mice lack NMDAR-dependent LTP, which is rescued by facilitating NMDAR activation or post-synaptic membrane depolarization in a pairing protocol; TRPM4 generates post-synaptic depolarization in a feed-forward loop necessary for full NMDAR activation.\",\n      \"method\": \"Trpm4-/- mice, in vitro electrophysiology (LTP/LTD protocols), pairing protocol rescue\",\n      \"journal\": \"Pflugers Archiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with rescue experiment establishing pathway position\",\n      \"pmids\": [\"26631168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PIP2 and PIP3 interact with the proximal N-terminal region (E733–W772) of TRPM4; R755 and R767 are important for PIP2/PIP3 binding specificity as their mutation reduces binding; PIP3-TRPM4 interaction is a novel finding.\",\n      \"method\": \"Biophysical binding assays, molecular modeling, mutagenesis of R755 and R767\",\n      \"journal\": \"Biophysical chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — binding assays with mutagenesis but limited functional electrophysiological validation\",\n      \"pmids\": [\"26071843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Selective cardiac TRPM4 deletion results in increased hypertrophic growth after chronic angiotensin II treatment; TRPM4-deficient cardiomyocytes show increased store-operated Ca2+ entry upon AngII treatment, elevated calcineurin activity and NFAT pathway activation, establishing TRPM4 as a negative regulator of calcineurin-NFAT-dependent cardiac hypertrophy.\",\n      \"method\": \"Cardiac-specific Trpm4 knockout mice, AngII treatment, Ca2+ measurements, calcineurin activity assays, gene expression\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with multiple cellular and molecular readouts\",\n      \"pmids\": [\"26043922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sur1-Trpm4 channels in TLR4-activated microglia regulate NOS2 transcription via a Ca2+-sensitive calcineurin/NFAT pathway; inhibiting or silencing Sur1 or Trpm4 paradoxically increases intracellular Ca2+, activating CaMKII phosphorylation of calcineurin, reducing NFAT nuclear translocation, and decreasing Nos2 expression and NO production.\",\n      \"method\": \"In vivo microglia, primary cultures from KO mice, co-immunoprecipitation, patch-clamp, Ca2+ imaging, chromatin immunoprecipitation, Griess assay\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including ChIP, electrophysiology, KO studies\",\n      \"pmids\": [\"27246103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The PLC inhibitor U73122 is a potent agonist of TRPM4 channels through covalent modification, directly activating TRPM4 independently of PLC, PIP2, and Ca2+; TRPM5 is insensitive while TRPM3 is inhibited, demonstrating specificity within the TRPM family.\",\n      \"method\": \"Patch-clamp electrophysiology in CHO, HEK293T, Jurkat cells with endogenous and recombinant TRPM4\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biophysical characterization across multiple cell lines\",\n      \"pmids\": [\"27328745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of full-length human TRPM4 in lipid nanodiscs at ~3 Å resolution reveals a well-defined Ca2+-binding site within the intracellular S1-S4 domain; two structures (with and without Ca2+) represent closed states; Ca2+ binding induces conformational changes that prime the channel for voltage-dependent opening.\",\n      \"method\": \"Single-particle cryo-EM in lipid nanodiscs\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structure with two states and functional interpretation\",\n      \"pmids\": [\"29217581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of mouse TRPM4 reveals three-tiered architecture; ATP binds at the N-terminal nucleotide-binding domain and inhibits channel activity; filter residue Gln973 is essential for monovalent cation selectivity; PtdIns(4,5)P2 and Ca2+-binding sites are located in the S1-S4 domain and TRP domain.\",\n      \"method\": \"Cryo-EM structure determination with and without ATP; functional validation of filter mutants\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structure with mutagenesis validating selectivity filter residue\",\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 an umbrella-like cytosolic architecture with coiled-coil pole and MHR helical ribs; two decavanadate-binding sites identified; Gln in selectivity filter is an important determinant of monovalent selectivity.\",\n      \"method\": \"Single-particle cryo-EM\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — independent high-resolution structure corroborating selectivity filter mechanism\",\n      \"pmids\": [\"29211723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AQP4 physically co-assembles with SUR1-TRPM4 to form a tripartite SUR1-TRPM4-AQP4 heteromultimeric complex that drives fast, high-capacity water transport and astrocyte swelling; the full tripartite complex is required for cell swelling, and genetic inactivation of the SUR1-TRPM4 solute pore blocks in vivo astrocyte swelling in brain edema.\",\n      \"method\": \"Co-immunoprecipitation, FRET, calcein fluorescence cell-swelling assays in COS-7 cells, primary astrocytes, and in vivo mouse brain edema model\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and FRET plus in vitro and in vivo functional validation\",\n      \"pmids\": [\"28906027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structure of full-length human TRPM4 in apo state at 3.7 Å identifies an upper gate in the selectivity filter and a lower gate at the entrance to the cytoplasmic coiled-coil; intramolecular interactions exist between TRP domain and S4-S5 linker; 24 lipid binding sites, one pore-loop disulfide bond, and N-linked glycosylation at an extracellular site are identified; five partially hydrated Na+ ions occupy the pore.\",\n      \"method\": \"Single-particle cryo-EM\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structure providing detailed gating and ion permeation mechanism\",\n      \"pmids\": [\"29463718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Gain-of-function mutations in the S6 transmembrane domain of TRPM4 (p.Ile1033Met, p.Ile1040Thr) cause progressive symmetric erythrokeratodermia; mutants show enhanced baseline activity, increased Ca2+ sensitivity, and elevated resting membrane potential; these substitutions affect activation gating as predicted by cryo-EM structures.\",\n      \"method\": \"Human genetic analysis, electrophysiology of mutant channels, in vitro keratinocyte overexpression studies\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — structure-guided mutagenesis with electrophysiological and cellular functional validation\",\n      \"pmids\": [\"30528822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 and TRPM5 are both required for taste transduction; loss of either channel significantly impairs sweet, bitter, and umami detection, and combined loss of both channels completely abolishes detection of these stimuli, placing both channels as downstream components of multiple taste signaling pathways.\",\n      \"method\": \"Trpm4-/- and double-KO mice, live cell Ca2+ imaging of taste receptor cells, behavioral taste preference assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with KO and double-KO establishing pathway position\",\n      \"pmids\": [\"29311301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"tPA induces PAR1-mediated, SUR1-TRPM4-dependent phasic secretion of MMP-9 from activated brain endothelial cells; tPA causes SUR1-TRPM4 channel opening via plasmin-, PAR1-, TRPC3- and Ca2+-dependent manner; inhibition of SUR1 decreases tPA-induced phasic but not tonic MMP-9 secretion.\",\n      \"method\": \"Patch-clamp electrophysiology, Ca2+ imaging, immunoblot, ELISA, zymography, genetic and pharmacological manipulations in brain endothelial cells, in vivo stroke model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing pathway\",\n      \"pmids\": [\"29617457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 is expressed in soma and proximal dendrites but not the axon initial segment of mPFC pyramidal neurons; a 9-phenanthrol-sensitive current is active at resting membrane potential in soma but not distal dendrites, indicating subcellular compartment-specific TRPM4 function.\",\n      \"method\": \"Multiplex immunofluorescence labeling, perforated patch-clamp with local perfusion\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional electrophysiological consequence, single lab\",\n      \"pmids\": [\"29440991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Deletion of Trpm4 unexpectedly reduces peak Na+ currents (Nav1.5-mediated) in cardiac myocytes, consistent with slower intraventricular conduction, suggesting TRPM4 regulates Nav1.5 function in murine cardiomyocytes.\",\n      \"method\": \"Trpm4-/- mice, perforated-patch clamp, immunoblotting, in vivo and Langendorff ECG\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with electrophysiology, but mechanism of TRPM4–Nav1.5 interaction not fully resolved, single lab\",\n      \"pmids\": [\"33810249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NMDAR-mediated excitotoxicity requires physical coupling of NMDARs to TRPM4 via intracellular near-membrane domains; disruption of the NMDAR/TRPM4 interaction interface by small molecules spares NMDAR-induced Ca2+ signaling but blocks excitotoxicity, mitochondrial dysfunction, and CREB shutoff, and reduces neuronal loss in stroke and retinal degeneration models.\",\n      \"method\": \"Co-immunoprecipitation, structure-based computational drug screening, small molecule interface inhibitors, mouse models of stroke and retinal degeneration\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP establishing complex plus structure-based drug design with multiple functional validations in vivo\",\n      \"pmids\": [\"33033186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Selective deletion of TRPM4 in cardiomyocytes results in ~50% reduction in LVH induced by transverse aortic constriction, identifying TRPM4 as a component of the mechanosensory signaling pathway that induces pressure overload-dependent hypertrophy.\",\n      \"method\": \"Cardiomyocyte-specific Trpm4 knockout mice, transverse aortic constriction, cardiac morphometry and function\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with clean functional readout\",\n      \"pmids\": [\"34190686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NO/cGMP/PKG signaling causes vasodilation by inhibiting TRPM4 channels in smooth muscle cells via IRAG; phosphorylation of IRAG by PKG inhibits IP3R-mediated Ca2+ release from the SR, thereby blocking Ca2+-dependent TRPM4 activation; IRAG, PKG, and IP3Rs form a nanoscale signaling complex on the SR.\",\n      \"method\": \"Patch-clamp electrophysiology, superresolution microscopy, IRAG knockdown, pharmacological inhibition of PKG/sGC\",\n      \"journal\": \"Function (Oxford, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including KD, pharmacology, superresolution imaging\",\n      \"pmids\": [\"34734188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRPM4 contributes to a long-lasting Ca2+ overload-induced background current regulating cardiomyocyte excitability; Trpm4-/- mice show reduced Ca2+-dependent triggered arrhythmias; meclofenamate is identified as a potent TRPM4 antagonist that suppresses catecholaminergic polymorphic ventricular tachycardia-associated arrhythmias in a TRPM4-dependent manner.\",\n      \"method\": \"Trpm4-/- mice, patch-clamp, in vivo telemetric ECG, compound screening, drug validation\",\n      \"journal\": \"European heart journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple electrophysiological and in vivo readouts plus pharmacological validation\",\n      \"pmids\": [\"35822895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SUR1-TRPM4 activation in microglia triggers K+ efflux via Na+ influx-driven opening of K+ channels, which activates NLRP3 inflammasome; this process requires P2X7 receptor-mediated Ca2+ influx to activate SUR1-TRPM4; GLB or 9-phenanthrol block this pathway.\",\n      \"method\": \"In vivo rat cardiac arrest model, BV2 microglial cells, siRNA knockdown, pharmacological inhibition, inflammasome assays\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple approaches but complex signaling cascade interpretation, single lab\",\n      \"pmids\": [\"35972671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Na+ influx through SUR1-TRPM4 in perivascular astrocyte endfeet induces Ca2+ transport via NCX1 in reverse mode, raising intra-endfoot Ca2+, which stimulates calmodulin-dependent translocation of AQP4 to the plasma membrane and water influx causing brain swelling after ischemic stroke.\",\n      \"method\": \"Mouse ischemic stroke model, pharmacological inhibition, astrocyte-specific KO of SUR1-TRPM4, Ca2+ imaging, AQP4 surface localization assays\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with multiple mechanistic readouts establishing pathway\",\n      \"pmids\": [\"37279286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A genome-wide CRISPR screen identifies TRPM4 as essential for necrosis-inducing anticancer therapy; TRPM4-mediated Na+ influx and cell swelling sustains lethal unfolded protein response (a-UPR) hyperactivation; TRPM4 knockout abolishes therapy-induced tumor regression in vivo and blocks immunogenic cell death signals.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, TRPM4 KO, in vivo tumor models, UPR assays, cell volume measurements, ATP depletion assays, macrophage activation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide screen plus KO with multiple orthogonal validations in vitro and in vivo\",\n      \"pmids\": [\"37522838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Persistent TRPM4 activation by compound NC1 induces necrotic cell death through Na+ overload (NECSO); NC1 specifically activates human but not mouse TRPM4 due to differences in a transmembrane region identified by domain swapping and molecular docking; gain-of-function cardiac arrhythmia mutations in TRPM4 increase vulnerability to NECSO.\",\n      \"method\": \"Domain swapping, molecular docking, TRPM4-deficient cells, electrophysiology, cell death assays, chemical screening\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — domain swapping and mutagenesis with functional validation identifies transmembrane determinants of species specificity\",\n      \"pmids\": [\"39915626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPM4 is a functional tetramer in detergent micelles and can be reconstituted into liposomes as a functional channel; single-channel recordings from proteoliposomes show inhibition by flufenamic acid.\",\n      \"method\": \"Crosslinking, native gel electrophoresis, multi-angle laser light scattering, electron microscopy, electrophysiology of proteoliposomes\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of purified channel in liposomes with functional validation\",\n      \"pmids\": [\"26785754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Piezo1 activation functionally couples to TRPM4 in atrial myocyte-like cells; Yoda1-induced Piezo1 activation changes action potential frequency, and this effect is significantly reduced by TRPM4 knockdown or pharmacological inhibition, demonstrating a Piezo1→Ca2+→TRPM4 signaling axis in cardiomyocytes.\",\n      \"method\": \"siRNA knockdown, pharmacological inhibition, fluorescent voltage-sensitive dye action potential recording in HL-1 cells\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD and pharmacology with functional readout, single lab, in vitro model\",\n      \"pmids\": [\"38098265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"p53 represses TRPM4 expression by acting on the TRPM4 promoter; loss of p53 or p63γ increases TRPM4 promoter activity, mRNA, protein, and Na+ currents; p53-mediated TRPM4 suppression increases store-operated Ca2+ entry and alters cell cycle distribution.\",\n      \"method\": \"CRISPR-Cas9 TRPM4 KO, p53 overexpression, promoter reporter assays, patch-clamp, Ca2+ imaging\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter plus KO with functional readouts, single lab\",\n      \"pmids\": [\"35500522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRPM4 inhibition in CA1 neurons and hippocampus contributes to synaptic plasticity; in Trpm4-/- rats, TRPM4 deletion impairs hippocampus-dependent spatial working and reference memory and affects LTP kinetics, with enhanced initial BOLD fMRI response in the stimulated hippocampus.\",\n      \"method\": \"Trpm4-/- rats, chronic in vivo electrophysiology, behavioral testing (Barnes maze, T-maze, Morris water maze), fMRI\",\n      \"journal\": \"Brain structure & function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with electrophysiology, behavior, and imaging, single lab\",\n      \"pmids\": [\"29571504\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRPM4 is a Ca2+-activated, voltage-dependent, monovalent-selective (Na+/K+) cation channel that depolarizes the plasma membrane to regulate Ca2+ entry driving force; it is positively modulated by PIP2, PKC phosphorylation, and calmodulin binding at its C-terminus, negatively regulated by ATP (which binds the N-terminal nucleotide-binding domain) and by the NO/cGMP/PKG/IRAG/IP3R signaling axis; structurally it forms a homotetramer with a defined Ca2+-binding site in the S1-S4 domain and a selectivity filter glutamine (Q973/Q in mouse) determining monovalent selectivity; it can co-assemble with SUR1 to form pharmacologically distinct SUR1-TRPM4 heteromers, and physically couples with NMDARs via intracellular near-membrane domains, with focal adhesion proteins, and with Piezo1 in cardiomyocytes; its diverse physiological roles—including myogenic vasoconstriction, mast cell degranulation, cardiac action potential shaping, hippocampal LTP, taste transduction, and inflammatory gene regulation—all stem from its core function of translating intracellular Ca2+ rises into membrane depolarization that feeds back on Ca2+ entry and downstream Ca2+-dependent signaling pathways.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRPM4 is a Ca²⁺-activated, voltage-dependent, monovalent cation-selective channel that depolarizes the plasma membrane to regulate Ca²⁺ entry driving force across diverse cell types, thereby shaping immune cell activation, vascular tone, cardiac action potentials, synaptic plasticity, and taste transduction. The channel is directly activated by intracellular Ca²⁺ (~400 nM KD), exhibits intrinsic voltage-dependent gating, and its Ca²⁺ sensitivity is positively modulated by PIP₂ binding at C-terminal and proximal N-terminal domains, PKC phosphorylation (particularly PKCδ-dependent membrane translocation), and calmodulin binding, while ATP binding at the N-terminal nucleotide-binding domain and the NO/cGMP/PKG/IRAG/IP₃R axis negatively regulate channel activity [PMID:12015988, PMID:12799367, PMID:15590641, PMID:16424899, PMID:34734188]. Cryo-EM structures reveal a homotetrameric architecture with a Ca²⁺-binding site in the intracellular S1–S4 domain, a selectivity filter glutamine essential for monovalent selectivity, dual gates, and an ATP-binding nucleotide-binding domain [PMID:29217581, PMID:29211714, PMID:29211723]. TRPM4 co-assembles with SUR1 to form SUR1-TRPM4 heteromers with enhanced Ca²⁺ sensitivity and sulfonylurea responsiveness that drive pathological cell swelling and inflammatory signaling in CNS injury, and physically couples with NMDARs through intracellular near-membrane domains to mediate excitotoxic neuronal death [PMID:23255597, PMID:33033186, PMID:37279286].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that TRPM4b is a Ca²⁺-activated channel selective for monovalent cations resolved the molecular identity of an endogenous depolarizing conductance that modulates Ca²⁺ entry driving force without itself conducting Ca²⁺.\",\n      \"evidence\": \"Cloning, heterologous expression, and patch-clamp electrophysiology in transfected cells\",\n      \"pmids\": [\"12015988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for monovalent selectivity unknown\", \"In vivo physiological role not yet demonstrated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating intrinsic voltage-dependent gating independent of divalent block established that TRPM4 integrates both Ca²⁺ and voltage signals, explaining its outward rectification.\",\n      \"evidence\": \"Whole-cell and cell-free patch-clamp with Boltzmann analysis and tail currents\",\n      \"pmids\": [\"12799367\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the voltage sensor unknown\", \"Coupling between Ca²⁺ binding and voltage gating unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying ATP, PKC phosphorylation, and calmodulin as modulators of TRPM4 Ca²⁺ sensitivity established a multi-input regulatory framework that controls channel activity under physiological conditions, while simultaneous demonstration of TRPM4's role in myogenic vasoconstriction provided the first native physiological function.\",\n      \"evidence\": \"Mutagenesis of ATP-binding/PKC/calmodulin sites with patch-clamp; antisense knockdown in cerebral arteries with pressure myography\",\n      \"pmids\": [\"15590641\", \"15472118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding sites for ATP not structurally resolved\", \"Identity of calmodulin binding mode at C-terminal sites not confirmed structurally\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing PIP₂ as a major positive modulator that shifts TRPM4 voltage dependence and increases Ca²⁺ sensitivity ~100-fold, acting through a C-terminal PH domain, revealed how membrane phosphoinositide metabolism tunes channel activity.\",\n      \"evidence\": \"Inside-out and whole-cell patch-clamp with PIP₂ application, PLC activation, and PH-domain mutagenesis\",\n      \"pmids\": [\"16424899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for PIP₂ binding not resolved at atomic level\", \"Relative contributions of PIP₂ vs PIP₃ not clarified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Trpm4 knockout mice revealed that TRPM4 is a negative regulator of Ca²⁺-dependent mast cell degranulation and that PKCδ drives TRPM4 membrane translocation in smooth muscle, establishing cell-type-specific roles for TRPM4 in immune and vascular contexts.\",\n      \"evidence\": \"Trpm4⁻/⁻ bone marrow-derived mast cells with degranulation assays; antisense/siRNA knockdown with surface biotinylation and pressure myography in smooth muscle\",\n      \"pmids\": [\"17293867\", \"17293488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking mechanism for PKCδ-dependent TRPM4 insertion not molecularly defined\", \"Whether TRPM4 regulates other immune cell types beyond mast cells not established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"De novo TRPM4 upregulation after spinal cord injury drives oncotic capillary cell death and secondary hemorrhage, establishing TRPM4 as a pathological effector of Na⁺ overload-induced necrosis in CNS injury.\",\n      \"evidence\": \"Trpm4⁻/⁻ mice and in vivo antisense in rodent SCI models with capillary integrity and lesion volume readouts\",\n      \"pmids\": [\"19169264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional mechanism of TRPM4 upregulation after injury not defined\", \"Whether SUR1 co-assembly is required for pathological function not yet tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Multiple studies established TRPM4 as a broad regulator of excitable and secretory cell physiology: it shapes catecholamine secretion from chromaffin cells, controls T helper cell Ca²⁺ signaling and NFAT localization, and is sensitized by H₂O₂ oxidation of Cys1093 to drive Na⁺ overload-dependent necrosis.\",\n      \"evidence\": \"Trpm4⁻/⁻ chromaffin cells with capacitance measurements; Trpm4 knockdown with Ca²⁺ imaging and NFAT assays in T cells; Cys1093 mutagenesis with patch-clamp and cell death assays\",\n      \"pmids\": [\"20679729\", \"20656926\", \"20884614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for Cys1093 oxidation-dependent desensitization removal unknown\", \"Mechanism linking TRPM4 to NFAT nuclear localization in T cells is indirect\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that SUR1 and TRPM4 co-assemble into heteromeric channels with doubled Ca²⁺ sensitivity and sulfonylurea responsiveness, appearing de novo after CNS injury, established a pharmacologically targetable pathological channel complex distinct from TRPM4 homomers.\",\n      \"evidence\": \"Co-immunoprecipitation, FRET, and patch-clamp in heterologous expression; in vivo SCI and EAE models with Trpm4⁻/⁻ mice\",\n      \"pmids\": [\"23255597\", \"23160238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for SUR1-TRPM4 co-assembly not resolved\", \"Stoichiometry of SUR1:TRPM4 subunits in the heteromer unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating that TRPM4 shapes ventricular action potential duration and β-adrenergic inotropy established its functional role in the cardiac conduction and contractility system.\",\n      \"evidence\": \"Trpm4⁻/⁻ mice with patch-clamp, pressure-volume loops, and membrane potential measurements\",\n      \"pmids\": [\"24226423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of TRPM4 vs TRPM5 in cardiac AP not dissected\", \"Subcellular targeting mechanism in cardiomyocytes not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"TRPM4 was identified as an essential co-activator of NMDARs during hippocampal LTP, generating a feed-forward depolarization necessary for full NMDAR activation, while cardiac-specific deletion revealed TRPM4 as a negative regulator of calcineurin-NFAT hypertrophic signaling.\",\n      \"evidence\": \"Trpm4⁻/⁻ mice with LTP/LTD electrophysiology and pairing-protocol rescue; cardiac-specific Trpm4 KO with AngII treatment and calcineurin assays\",\n      \"pmids\": [\"26631168\", \"26043922\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical basis for TRPM4-NMDAR functional coupling not yet demonstrated\", \"Whether TRPM4-dependent LTP operates in brain regions beyond CA1 unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cryo-EM structures at ~3 Å resolution defined the homotetrameric architecture, identified the Ca²⁺-binding site in the S1–S4 domain, the ATP-binding nucleotide-binding domain, and the selectivity filter glutamine responsible for monovalent selectivity, providing an atomic framework for decades of functional data.\",\n      \"evidence\": \"Single-particle cryo-EM of human and mouse TRPM4 in lipid nanodiscs/detergent with and without Ca²⁺/ATP; mutagenesis validation of filter residue\",\n      \"pmids\": [\"29217581\", \"29211714\", \"29211723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Open-state structure not captured\", \"PIP₂-bound structure not available at high resolution\", \"Conformational transition pathway from Ca²⁺-primed to voltage-activated state unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Multiple discoveries expanded TRPM4's physiological scope: it cooperates with TRPM5 for sweet/bitter/umami taste transduction, contributes to SUR1-TRPM4-AQP4 tripartite complex-driven brain edema, and gain-of-function S6 domain mutations cause progressive symmetric erythrokeratodermia.\",\n      \"evidence\": \"Trpm4⁻/⁻ and double-KO mice with taste behavioral assays; co-IP/FRET of SUR1-TRPM4-AQP4 with in vivo edema models; human genetics with mutant channel electrophysiology\",\n      \"pmids\": [\"29311301\", \"28906027\", \"30528822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRPM4 and TRPM5 divide labor in taste cells not molecularly resolved\", \"Structural basis for gain-of-function erythrokeratodermia mutations at the gate not fully modeled\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Establishing that NMDARs physically couple to TRPM4 via intracellular near-membrane domains, and that disrupting this interface blocks excitotoxicity while preserving NMDAR Ca²⁺ signaling, provided a druggable mechanism separating physiological from pathological NMDAR function.\",\n      \"evidence\": \"Co-immunoprecipitation, structure-based computational screening, small molecule interface disruptors validated in stroke and retinal degeneration mouse models\",\n      \"pmids\": [\"33033186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact binding interface residues on TRPM4 side not mapped\", \"Whether NMDAR-TRPM4 coupling exists in all neuronal subtypes unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of NO/cGMP/PKG/IRAG/IP₃R as an upstream inhibitory axis for TRPM4 in smooth muscle connected canonical vasodilatory signaling directly to TRPM4 channel gating, while cardiomyocyte-specific deletion showed TRPM4 contributes to pressure overload-induced hypertrophy.\",\n      \"evidence\": \"Patch-clamp with superresolution microscopy and IRAG knockdown; cardiomyocyte-specific Trpm4 KO with transverse aortic constriction\",\n      \"pmids\": [\"34734188\", \"34190686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRAG-IP₃R complex acts as a direct TRPM4 regulatory scaffold is unknown\", \"Downstream effectors linking TRPM4-mediated depolarization to hypertrophic gene expression not fully defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"TRPM4 contributes to arrhythmogenic triggered activity via Ca²⁺ overload-induced background current, and meclofenamate was identified as a TRPM4 antagonist that suppresses arrhythmias in a TRPM4-dependent manner, opening a therapeutic avenue for CPVT.\",\n      \"evidence\": \"Trpm4⁻/⁻ mice with telemetric ECG, patch-clamp, and compound screening with pharmacological validation\",\n      \"pmids\": [\"35822895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Meclofenamate binding site on TRPM4 unknown\", \"Selectivity of meclofenamate across TRP channels not fully characterized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A genome-wide CRISPR screen identified TRPM4 as essential for necrosis-inducing anticancer therapy by sustaining lethal UPR hyperactivation through Na⁺ influx-driven cell swelling, while astrocytic SUR1-TRPM4/NCX1/AQP4 signaling was shown to drive post-ischemic brain edema via reverse-mode NCX1 Ca²⁺ entry.\",\n      \"evidence\": \"CRISPR screen with TRPM4 KO in tumor models; astrocyte-specific SUR1-TRPM4 KO in ischemic stroke model with Ca²⁺ imaging and AQP4 translocation assays\",\n      \"pmids\": [\"37522838\", \"37279286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPM4 function in immunogenic cell death is generalizable across cancer types unknown\", \"Calmodulin-dependent AQP4 translocation mechanism downstream of TRPM4-NCX1 not structurally resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Species-specific TRPM4 activation by compound NC1 induces necrotic cell death through sustained Na⁺ overload (NECSO), with domain-swapping experiments mapping species selectivity to a transmembrane region and cardiac gain-of-function mutations increasing NECSO vulnerability.\",\n      \"evidence\": \"Domain swapping between human and mouse TRPM4, molecular docking, electrophysiology, and cell death assays\",\n      \"pmids\": [\"39915626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact NC1 binding pocket not resolved crystallographically\", \"Whether NECSO pathway is relevant to human cardiac arrhythmia pathology in vivo unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of the open/conducting state and the voltage-gating conformational transition, the stoichiometry and atomic structure of SUR1-TRPM4 heteromers, identification of all post-translational modifications controlling trafficking and gating in vivo, and whether TRPM4-targeted therapeutics can be developed with sufficient selectivity for clinical translation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No open-state cryo-EM structure available\", \"SUR1-TRPM4 heteromer stoichiometry and structure unresolved\", \"Comprehensive in vivo post-translational modification map lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 26, 27, 30]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [4, 22]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [1, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 9, 18, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 26, 27, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 12, 23, 38]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 16, 40]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [21, 36, 47]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [17, 39]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 15, 31]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [32]}\n    ],\n    \"complexes\": [\n      \"SUR1-TRPM4\",\n      \"SUR1-TRPM4-AQP4\",\n      \"TRPM4 homotetramer\"\n    ],\n    \"partners\": [\n      \"ABCC8\",\n      \"AQP4\",\n      \"GRIN1\",\n      \"PIEZO1\",\n      \"CALM1\",\n      \"PRKCD\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}