Methods Cardiomyocytes and cardiac fibroblasts were isolated by trypsin digestion method. DNA and protein synthesis were measured by 3 H-deoxythy-midine( 3 H-TdR) and 3 H-Leucine( 3 H-Leu) incorporation. Protein content was measured by Bradford method.

• 方法采用体外乳鼠心肌细胞和心脏成纤维细胞培养,一定浓度的ET-1、ANP单独或联合作用细胞24h,以3H-胸腺嘧啶脱氧核苷(3H-TdR)、3H-亮氨酸(3H-Leu)掺入法测定细胞DNA、蛋白合成,Brad-ford法测细胞总蛋白含量,RT-PCR法测心肌细胞心钠素ANPmRNA的表达,评价ET-1、ANP对心肌细胞和成纤维细胞的作用。