Transient receptor potential melastatin-3 (TRPM3)

Transient receptor potential melastatin-3 (TRPM3) is a non-selective cation channel belonging to the melastatin subfamily of transient receptor potential (TRP) channels. It is primarily known for its roles in sensory transduction—especially heat sensation—and as a regulator of cellular calcium influx[1][2][5]. TRPM3 is activated by several stimuli, including temperature and endogenous neurosteroids like pregnenolone sulfate. Its function in the nervous system extends to pain perception and modulation, and it is subject to inhibition via GPCR signaling pathways (notably by Gβγ subunits released upon GPCR activation, which contributes to the analgesic effect of morphine)[4]. Numerous splice variants exist in both humans and mice, contributing to functional diversity[2]. Disease-associated gain-of-function mutations in the TRPM3 gene result in severe neurological phenotypes[5]. Pharmacological modulation of TRPM3 includes both selective and broad-spectrum ion channel modulators, though therapeutic targeting is complicated by safety and selectivity challenges.

Other names

TRPM3Transient receptor potential cation channel subfamily M member 3

Direct antagonism of the channel pore (e.g., by primidone); Modulation via G-protein coupled receptors (GPCRs); GPCR activation leads to Gβγ inhibition of TRPM3, contributing to morphine’s analgesic action; Activation by neurosteroids and heat (modulation of channel gating by agonists/antagonists)