Transient receptor potential canonical proteins (TRPC)

Transient receptor potential canonical (TRPC) proteins are a family of six functional human non-selective cation channels (TRPC1, TRPC3-7) that play a critical role in cellular calcium homeostasis and membrane potential regulation [1, 2, 14]. These channels are primarily localized to the plasma membrane and are activated through G-protein coupled receptor (GPCR) and phospholipase C (PLC) signaling pathways, facilitating the influx of calcium and sodium ions into the cytosol [11, 19]. In physiological contexts, TRPCs modulate essential processes such as synaptic plasticity, vascular tone, and podocyte actin dynamics; however, their dysregulation is strongly implicated in diverse pathologies, including chronic kidney disease, neurological disorders, and various cancers [1, 6, 7]. Therapeutic interest in TRPC channels has accelerated due to their involvement in focal segmental glomerulosclerosis (FSGS) and depression, leading to the development of several subtype-selective small molecule inhibitors currently in clinical trials [13, 16]. For instance, TRPC5 inhibitors aim to protect kidney function by preventing Rac1-mediated cytoskeletal remodeling in podocytes, while TRPC4/5 antagonists are being explored for their anxiolytic and antidepressant effects [1, 13]. Despite their promise as drug targets, the broad tissue distribution of the TRPC family presents challenges regarding target specificity and potential off-target safety concerns in the central nervous and cardiovascular systems [5, 18, 23].

Other names

Short TRP channelsTRP-canonicalClassical transient receptor potential channelsCanonical transient receptor potential channels

Small molecule inhibition of non-selective cation influx to stabilize the channel in a non-conductive closed state, thereby reducing intracellular calcium levels and membrane depolarization [1, 13, 16].