Abstract
To investigate the effects of sodium tanshinone II A sulfonate (STS) on the hypertrophy induced by angiotensin II (Ang II) in primary cultured neonatal rat cardiac myocytes. The effect of STS on cytotoxicity was evaluated using the 3-(4,5-dimethylthiazol-2-yl)-3,5-phenytetrazoliumromide (MTT) assay. As indexes for cardiocyte hypertrophy, cell size was determined by phase contrast microscopy and protein synthesis rate was measured by 3H-leucine incorporation. The proto-oncogene c-fos mRNA expression of cardiocytes was assessed using reverse transcription polymerase chain reaction (RT-PCR). STS could inhibit cardiocyte hypertrophy, increase the protein synthesis rate and enhance proto-oncogene c-fos mRNA expression in cardiocytes induced by Ang II (P<0.01), with an effect similar to that of Valsartan, the Ang II receptor antagonist. STS can prevent the hypertrophy of cardiac myocytes induced by Ang II, which may be related to its inhibition of the expression of proto-oncogene c-fos mRNA.
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