缺血—再灌注损伤对大鼠心肌中氨基酸的影响及牛磺酸的保护作用

使用大鼠离体作功心脏缺血一再灌注损伤模型,观察心肌内游离氨基酸含量的变化以及牛磺酸(Taurine,Tau)对心脏的影响.发现再灌注损伤使心肌内所测17种游离氨基酸含量除Cys外部减少,其中Tau降低最显著.20 mmol·L~(-1)Tau能改善心脏的再灌注损伤,表现为:在再灌注期间促进心脏机械功能的恢复,减少室性心律失常的发生率,减少LDH与CK从心肌中漏出,减少脂质过氧化作用与钙的积聚以及减少心肌内游离氨基酸的丢失.提示:外源性Tau能够改善心脏的缺血一再灌注损伤.

The effect of ischemia-reperfusion injury on concentrations of free amino acids in rat myocardium and taurine's protective role

By using the model of ischemia-reperfusion injury in the isolated working rat heart,the change of free amino acid concentrations in myocardium and the effect of taurine on the heart were investegated. It was found that concentrations of 17 free amino acids in myocardium, except Cys,decreased,and that 20mM taurine was able to ameliorate the ischemia-reperfusion injury of the heart ;e. g. , the improvement of recovery of cardiac mechanical functions, the decrease in the leakage of LDH and CK from myocardium,in the accumulation of lipid peroxides and calcium,and in the loss of free amino acids in myocardium,as well as the decrease in the occurence rate of ventricular arrhythmias during the reperfusion phase. So, it may be suggested that exogenous taurine has some protective effects against the myocardial is-chemia-reperfuaion injury.