Abstract
Simvastatin (SIM), a HMG-CoA reductase inhibitor, has therapeutic effects that are not limited to cholesterol reduction. In this study, we investigated the change in the cell surface area and protein content of cultured rat cardiomyocytes on exposure to cardiotrophin-1 (CT-1), a cytokine involved in the growth and survival of cardiac cells, plus SIM, and thus confirmed that SIM ameliorated cardiomyocyte hypertrophy induced by CT-1. We also showed that SIM attenuated cardiac hypertrophy in rats with pressure overload due to abdominal aortic constriction by measuring such parameters as systolic blood pressure, ratio of heart weight to body weight and ratio of left ventricular weight to body weight in rats as well as cross-sectional area of cardiomyocytes. Western blot analysis indicated that the Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway was involved in the mechanisms underlying the in vitro and in vivo inhibitory effects of SIM on cardiac hypertrophy. Moreover, the effect of SIM amelioration on CT-1-induced cultured cardiomyocyte hypertrophy might be related to the change in angiotensinogen (AGT) mRNA expression, as evidenced by RT-PCR analysis, and the subsequent alteration in angiotensin I...Continue Reading
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