Atorvastatin blocks increased L-type Ca2+ current and cell injury elicited by angiotensin II via inhibiting oxide stress

作者：Ma, Yanzhuo; Kong, Lingfeng; Qi, Shuying; Wang, Dongmei^*

来源：Acta Biochimica et Biophysica Sinica, 2016, 48(4): 378-384.

DOI：10.1093/abbs/gmw009

• atorvastatin
• angiotensin II
• L-type Ca2+ current
• apoptosis

The L-type Ca2+ current (I-Ca,I- 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 the I-Ca,I- L and 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, I-Ca,I- L was 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 evoked I-Ca,I- L in a voltage-dependent manner without affecting the I-V relationship. 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.

• 出版日期2016-4
• 单位河北医科大学; 中国人民解放军白求恩国际和平医院