L-type Ca2+ current in ventricular cardiomyocytes

L-type Ca2+ channels are mediators of Ca2+ influx and the regulatory events accompanying it and are pivotal in the function and dysfunction of ventricular cardiac myocytes. L-type Ca2+ channels are located in sarcolemma, including the T-tubules facing the sarcoplasmic reticulum unction, and are activated by membrane depolarization, but intracellular Ca2+-dependent inactivation limits Ca2+ influx during action potential. I-CaL is important in heart function because it triggers excitation-contraction coupling, modulates action potential shape and is involved in cardiac arrhythmia. L-type Ca2+ channels are multi-subunit complexes that interact with several molecules involved in their regulations, notably by beta-adrenergic signaling. The present review highlights some of the recent findings on L-type Ca2+ channel function, regulation, and alteration in acquired pathologies such as cardiac hypertrophy, heart failure and diabetic cardiomyopathy, as well as in inherited arrhythmic cardiac diseases such as Timothy and Brugada syndromes. (C) 2009 Elsevier Inc. All rights reserved.