粉防己碱对高血压心肌肥厚大鼠心肌胶原含量和肌球蛋白ATP酶活性的影响(英文)

Effects of tetrandrine on hydroxyproline content and myosin ATPase activity of hypertrophied myocardium in renovascular hypertensive rats

观察粉防己碱对高血压心肌肥厚大鼠心肌胶原含量和肌球蛋白ATP酶活性的影响 .采用二肾一夹肾血管性高血压造成大鼠左心室肥厚模型 ,自术后第 9周起按粉防己碱 50mg·kg- 1,依那普利 6mg·g- 1灌胃给药 ,每日 1次 ,连续 8周 .用分光光度法测定心肌羟脯氨酸含量及肌球蛋白ATP酶活性 .结果表明左心室肥厚组心肌羟脯氨酸为 (5.9± 0 .3)mg·g- 1干重 ,明显高于假手术对照组〔(3.6± 0 .4 )mg·g- 1干重〕 ,粉防己碱组和依那普利组心肌羟脯氨酸含量分别较左心室肥厚组低 2 8.2 %和 39.0 % .左心室肥厚组肌球蛋白ATP酶活性仅为 (0 .4 3± 0 .0 9)mmolPi·min- 1·g- 1蛋白质 ,较假手术对照组〔(0 .97±0 .0 6 )mmolPi·min- 1·g- 1蛋白质〕明显降低 ,而粉防己碱组和依那普利组则分别比左心室肥厚组高 6 0 .5%和 118.6 % .实验结果表明粉防己碱可部分逆转肾血管性高血压所致的大鼠左心室肥厚 ,降低心肌胶原含量 。

To study the effects of tetrandrine (Tet) on hypertrophied myocardial hydroxyproline content and myosin ATPase activity, left ventricular hypertrophy(LVH) was induced by renovascular hypertension (two-kidney, one-clip) in rats. Eight weeks after operation Tet 50 mg·kg -1 ·d -1 and enalapril(Ena) 6 mg·kg -1 ·d -1 were given by gavage for 8 weeks. The results showed that hydroxyproline content in LVH group was much higher than that of sham-operated one 〔(5.9±0.3) vs (3.6±0.4) mg·g -1 dry weight〕, and was decreased by 28.2% and 39.0% in Tet and Ena groups, respectively. Myosin ATPase activity in LVH group was much lower than that of sham-operated group 〔(0.43±0.09) vs (0.97±0.06) mmol Pi·min -1 ·g -1 protein, P<0.01〕. In Tet and Ena groups they were 60.5% and 118.6% higher than that of LVH group, respectively. The results suggest that Tet or Ena partially reduce the hydroxyproline content and elevate myosin ATPase activity of hypertrophied myocardium in renovascular hypertensive rats.