TRPM4 Antibody – Polyclonal

The protein encoded by this gene is a calcium-activated nonselective ion channel that mediates transport of monovalent cations across membranes, thereby depolarizing the membrane. The activity of the encoded protein increases with increasing intracellular calcium concentration, but this channel does not transport calcium. [provided by RefSeq, Mar 2016]

TRPM4: Calcium-activated non selective (CAN) cation channel that mediates membrane depolarization. While it is activated by increase in intracellular Ca(2+), it is impermeable to it. Mediates transport of monovalent cations (Na(+) > K(+) > Cs(+) > Li(+)), leading to depolarize the membrane. 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. Defects in TRPM4 are the cause of progressive familial heart block type 1B (PFHB1B). It is a cardiac bundle branch disorder characterized by progressive alteration of cardiac conduction through the His-Purkinje system, with a pattern of a right bundle-branch block and/or left anterior hemiblock occurring individually or together. It leads to complete atrioventricular block causing syncope and sudden death. Belongs to the transient receptor (TC 1.A.4) family. LTrpC subfamily. TRPM4 sub-subfamily. 3 isoforms of the human protein are produced by alternative splicing.

Protein type: Membrane protein, multi-pass; Membrane protein, integral

Chromosomal Location of Human Ortholog: 19q13.33

Cellular Component: cell soma; cytosol; endoplasmic reticulum; Golgi apparatus; integral to membrane; nucleoplasm; plasma membrane

Molecular Function: ATP binding; calcium activated cation channel activity; calcium channel activity; calmodulin binding; sodium channel activity

Biological Process: adaptive immune response; dendritic cell chemotaxis; elevation of cytosolic calcium ion concentration; negative regulation of bone mineralization; negative regulation of osteoblast differentiation; positive regulation of cell proliferation; positive regulation of fat cell differentiation; positive regulation of heart rate; positive regulation of vasoconstriction; protein sumoylation; regulation of T cell cytokine production; vasoconstriction

Disease: Progressive Familial Heart Block, Type Ib