Title: Pleiotropic Effect of Statins as Antioxidants on Cardiac Hypertrophy
Volume: 8
Issue: 2
Author(s): Hironori Nakagami and Ryuichi Morishita
Affiliation:
Keywords:
HMG-CoA reductase inhibitor, Rho, eNOS
Abstract: A number of clinical studies suggest that 3-hydroxyl-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors or statins reduce the incidence of myocardial infarction and other cardio-cerebrovascular events. Recently, the pleiotropic effects of statins have been reported in cardiovascular cells and provided a new insight into the molecular mechanism of cardiovascular and other diseases. The favorable effects of statins could be expanded to antioxidant effects. Statins can block the isoprenylation and activation of members of the Rho family, such as RhoA and Rac1. Rac1 also regulates NADPH oxidase, which is a major source of reactive oxygen species (ROS) in cardiovascular cells. Thus, statins may attenuate oxidative stress through inhibition of Rac1. Interestingly, fluvastatin showed additional hydroxyl radical scavenging activity as potent as that of well known antioxidants, dimethylthiourea and alpha-tocopherol. This antioxidant effect may be derived from the unique chemical structure of fluvastatin. Cardiac hypertrophy is an initial physiological adaptive response of the heart to pressure overload. However, if pressure overload persists, frequently, the heart decompensates and develops “pathophysiological” hypertrophy. Growing evidence suggests that ROS may be involved in the process of cardiac hypertrophy, and recent research has shown that statins can attenuate cardiac hypertrophy through inhibition of Rac1. The new evidence of therapeutic implications of statin therapy as antioxidant therapy will likely yield important new insights.
