title: Atorvastatin blocks increased l-type Ca2+ current and cell injury elicited by angiotensin II via inhibiting oxide stress.
abstract: Thel-type Ca(2+)current (ICa,l) plays a crucial role in shaping action potential and is involved in cardiac arrhythmia. Statins have been demonstrated to contribute to anti-apoptotic and anti-arrhythmic effects in the heart. Here, we examined whether atorvastatin regulates theICa,land cell injury induced by angiotensin II (AngII) as well as the putative intracellular cascade responsible for the effects. Cultured neonatal rat ventricular myocytes were incubated with AngII for 24 h, and then cell injury and expression levels of Nox2/gp91(phox), p47(phox) ,and Cav1.2 were analyzed. In addition,ICa,lwas recorded using the whole-cell patch-clamp technique, and mechanisms of atorvastatin actions were also investigated. It was found that the number of apoptotic cardiomyocytes was increased and cell viability was significantly decreased after AngII administration. AngII also augmented the expressions of Nox2/gp91(phox)and p47(phox)compared with control cardiomyocytes. Exposure to AngII evokedICa,lin a voltage-dependent manner without affecting theI-Vrelationship. In addition, AngII enhanced membrane Cav1.2 expression. These effects were abolished in the presence of the reactive oxygen species (ROS) scavenger, manganese (III)-tetrakis 4-benzoic acid porphyrin [Mn(III)TBAP], or the 3-hydroxy-3-methylglutaryl-CoA reductase inhibitor, atorvastatin. These results suggested that atorvastatin mediates cardioprotection against arrhythmias and cell injury by controlling the AngII-ROS cascade.
authors.affiliation: Department of Cardiology, Bethune International Peace Hospital, Shijiazhuang 050000, China.
authors.forename: Yanzhuo
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Department of Cardiology, Bethune International Peace Hospital, Shijiazhuang 050000, China Hebei Medical University, Shijiazhuang 050011, China.
authors.forename: Lingfeng
authors.initials: L
authors.lastname: Kong
authors.affiliation: Department of Cardiology, Bethune International Peace Hospital, Shijiazhuang 050000, China.
authors.forename: Shuying
authors.initials: S
authors.lastname: Qi
authors.affiliation: Department of Cardiology, Bethune International Peace Hospital, Shijiazhuang 050000, China slwangdm@126.com.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Wang
mesh_terms: D000804:Angiotensin II / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn; D000069059:Atorvastatin / Q000494:pharmacology*; D020746:Calcium Channels, L-Type / Q000378:metabolism*; D002460:Cell Line; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D020746:Calcium Channels, L-Type; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D017382:Reactive Oxygen Species; D000804:Angiotensin II; D000069059:Atorvastatin
keywords: angiotensin II; apoptosis; atorvastatin; l-type Ca2+ current