丹酚酸B对大鼠心肌缺血再灌注损伤的保护作用机制研究

目的探讨丹酚酸B(Salvianolic acid B,SalB)对大鼠心肌缺血再灌注损伤(myocardial ischemia reperfusion injury,MIRI)的保护作用机制。方法大鼠心肌缺血60min后再灌注60min造成大鼠心肌缺血再灌注损伤模型,测定给药后心肌组织匀浆、血浆中内皮素(ET)、血清中一氧化氮(NO)和一氧化氮合酶(NOS)的变化,并通过病理组织学检查,观察SalB对MIRI模型的治疗作用。结果SalB中、高剂量组均能减少心肌组织和血浆中ET的含量,提高NOS的活性,增加NO的释放(P<0.05或P<0.01)。结论SalB减轻MIRI可能是通过调节ET/NO系统的平衡,维持冠脉血管张力,改善心肌能量代谢障碍而实现的。

Protective Mechanism of Salvianolic Acid B on Myocardial Ischemia - reperfusion Injury of Rats

Objective To investigate the protective mechanism of Salvianolic acid B (Sal B) on experimental in-vivo myocardial ischemia-reperfusion injury (MIRI)in rats. Methods Rats model of myocardial ischemia-reperfusion injury was induced by ischemia for 60 min and then reperfusion for 60 min. After treatment,endothelin (ET) levels in plasma and the homogenate of myocardial tissue,and serum levels of nitric oxide (NO) and NO synthase were measured. Meanwhile,the pathological changes of myocardial tissue were also observed. Results Compared with the model group,middle-dose and high-dose Sal B could depress the ET levels in the plasma and the myocardial tissue,and increase the content of serum NO and NOS (P<0.05 or P<0.01). Conclusion Sal B could alleviate MIRI probably by regulating the balance of ET/NO systems in coronary artery,maintaining the tension of coronary artery and improving the energy metabolism of myocardial tissue.