摘 要 ：目的：观察粉防已碱(tetrandrine, Tet)对血管紧张素II(angiotensin Ⅱ, Ang Ⅱ)诱导的心肌肥大及p-ERK1/2表达及活性的影响。方法：培养新生大鼠心肌细胞,用相差显微镜计数心肌细胞搏动频率、细胞图像分析系统测量细胞体积、考马斯亮蓝法测定心肌细胞总蛋白含量、［3H］-亮氨酸掺入法测定蛋白合成速率作为心肌肥大指标；以ERK免疫沉淀活性试剂盒测定ERK活性,Western-blot测定p-ERK1/2表达。结果：Tet能显著抑制Ang II诱导的心肌细胞搏动频率、体积、总蛋白含量、蛋白合成速率的上升；对p-ERK1/2表达及活性具有剂量依赖性的抑制作用。结论：Tet可以明显抑制Ang II诱导的心肌肥大,机制与降低p-ERK1/2表达及活性有关。
Abstract:Objective： To observe effects of tetrandrine (Tet) on angiotensin II (Ang II)-induced cardiomyocyte hypertrophy and the activity and expression of phosphorylated ERK1/2 (p-ERK1/2). Method： In the primary culture of neonatal rat cardiomyocytes, as indexes of cardiomyocyte hypertrophy, pulsation rate was measured under phase contrast microscope. Cell size was determined by cell morphology analytical system. The total protein was determined by coomassie brilliant blue and protein synthesis rate was measured by ［3H］-Leucine incorporation. ERK activity was measured by immuno-precipitation. The expression of p-ERK1/2 was assessed using Western blot. Result： Tet can decrease Ang II-induced elevations of the pulsation rate, cell size, total protein and protein synthesis rate; inhibit the activity and expression of p-ERK1/2. Conclusion： The anti-hypertrophic effect of Tet on Ang II-induced cardiomyocyte hypertrophy was associated with inhibition of ERK1/2 signaling pathway.