大鼠心脏血压超负荷诱导左心室HSP70基因表达

TRANSCRIPTION OF HSP 70 GENE INDUCED BY PRESSURE OVERLOAD IN LEFT VENTRICULE OF RATS

本工作应用热休克蛋白７０（ＨＳＰ７０）核酸分子杂交方法，测定了大鼠腹主动脉缩窄后左心室ＨＳＰ７０ｍＲＮＡ的水平。结果表明：大鼠腹主动脉缩窄后４ｈ，动脉血压已明显升高，并持续在高水平上；大鼠左心室重／体重比在第三天开始增加，然后持续升高，第４周时比对照组增加５９％；左心室ＨＳＰ７０ｍＲＮＡ在腹主动脉缩窄后４ｈ已明显升高，１ｄ，２ｄ，１ｗ均维持在高水平，１ｗ后逐渐消失。实验结果提示：大鼠心肌负荷增加早期，左心室ＨＳＰ７０ｍＲＮＡ表达明显增加。

The changes of heat shock protein 70 (HSP70) messenger RNA was examined in rats after abdominal aortic partial ligation. Four hours after ligation, the systemic arterial pressure was increased and thereafter maintained at a high level. The ratio of left ventricule weight to body weight began to increase at the third day and increased by 59%,comparing with that of the sham-operated rats at 4 w. Accumulation of HSP 70mRNA was observed at 4 h and maintained at high level at 1 d, 2 d, 1 w and then gradually disappeared there after. The above experimental results suggest that transcription of HSP 70 gene was induced at an early stage of cardiac hypertrophy caused by pressure overload.