Key result
Atorvastatin abolished Angiotensin II-induced increases in L-type Ca2+ current, membrane Cav1.2 expression, and cardiomyocyte apoptosis by controlling the reactive oxygen species cascade.
Atorvastatin mediates cardioprotection against arrhythmias and cell injury by controlling the AngII-ROS cascade in cultured neonatal rat ventricular myocytes.
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May attenuate AngII-induced myocyte injury via ROS in vitro; hypothesis-generating with no clinical implications yet.
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.
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Ma et al. (2016) studied Angiotensin II-induced cell injury and arrhythmias (in vitro model). Atorvastatin vs. Angiotensin II alone / Control cardiomyocytes was evaluated on Cell injury, apoptosis, and L-type Ca2+ current (ICa,L). Atorvastatin abolished Angiotensin II-induced increases in L-type Ca2+ current, membrane Cav1.2 expression, and cardiomyocyte apoptosis by controlling the reactive oxygen species cascade.
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