High-voltage-activated L-type calcium channel (LTCC) (LTCC)

High-voltage-activated L-type calcium channels (LTCCs) are essential transmembrane proteins that mediate the entry of calcium ions into excitable cells in response to membrane depolarization. These channels are heteromultimeric complexes consisting of a pore-forming alpha-1 subunit (Cav1.1 to Cav1.4) and auxiliary subunits (beta, alpha-2-delta, and gamma) that modulate channel kinetics and trafficking (Catterall, 2011, PMID: 21123605). LTCCs play a pivotal role in various physiological processes, including cardiac and smooth muscle contraction, endocrine secretion, and synaptic plasticity (Striessnig et al., 2014, PMID: 24611935). In the cardiovascular system, Cav1.2 is the dominant isoform, serving as the primary target for calcium channel blockers used to treat hypertension and angina (Zamponi et al., 2015, PMID: 26380315). These drugs are categorized into three chemical classes: dihydropyridines, phenylalkylamines, and benzothiazepines, each binding to distinct sites on the alpha-1 subunit (StatPearls, 2023, NBK482474). Mutations in LTCC genes are associated with severe channelopathies, such as Timothy syndrome and certain forms of blindness and deafness (Splawski et al., 2004, PMID: 15459383).

Other names

L-type calcium channelCav1 channelDihydropyridine receptorDHPRVoltage-gated calcium channel type 1Voltage-dependent L-type calcium channel

Antagonism of the pore-forming alpha-1 subunit to inhibit calcium ion influx into excitable cells.