Voltage-dependent L-type calcium channel (LTCC) (LTCC)

The voltage-dependent L-type calcium channel (LTCC) is a high-voltage-activated ion channel complex essential for the physiological function of cardiac and vascular smooth muscle (UniProt P16230). In cardiac myocytes, LTCCs (primarily the Cav1.2 isoform) facilitate the influx of calcium ions during the action potential plateau, which triggers the release of larger calcium stores from the sarcoplasmic reticulum to initiate contraction (PubMed: 29038202). In vascular smooth muscle cells, these channels regulate myogenic tone and systemic vascular resistance by controlling intracellular calcium levels (PubMed: 18467515). Dysfunction or overactivity of LTCCs is strongly associated with cardiovascular diseases, including hypertension, supraventricular tachycardias, and Prinzmetal angina (StatPearls: Calcium Channel Blockers, 2023). Pharmacological modulation of LTCCs using calcium channel blockers (CCBs) like dihydropyridines and non-dihydropyridines is a cornerstone of cardiovascular therapy. These agents inhibit calcium entry, leading to smooth muscle relaxation (vasodilation) and reduced cardiac contractility or conduction velocity. Understanding the tissue-specific expression and subunit composition of these channels remains vital for developing selective therapies with minimized side effects like peripheral edema or bradycardia.

Other names

L-type calcium channelCav1.2Cav1.3Dihydropyridine receptorVoltage-gated calcium channel type 1.2CACNA1CCACNA1D

Inhibition of calcium ion influx through the L-type calcium channel pore, leading to decreased intracellular calcium concentrations and subsequent muscle relaxation or reduced cardiac excitability (StatPearls, 2023).