碟脉灵注射液对大鼠心肌缺血再灌注损伤的保护作用

目的：观察碟脉灵注射液（DMLI）对大鼠心肌缺血再灌注损伤的保护作用。方法：在体大鼠结扎冠状动脉前降支30 min，再灌注24 h造成心肌缺血再灌注模型，计算心肌梗死范围（MIS），测定血清天冬氨酸氨基转移酶（AST）、乳酸脱氢酶（LDH）、心肌型肌酸激酶同功酶（CK-MB）、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性及丙二醛（MDA）含量，并测定血浆前列环素（PGI₂）及血栓素A₂(TXA₂)水平。结果：与再灌模型组比较，DMLI 5、10 mL·kg^-1组MIS明显缩小，血清AST、LDH、CK-MB活性及MDA含量明显降低，SOD及GSH-Px活性明显升高，血浆TXA₂水平明显下降，PGI₂水平及PGI₂/TXA₂比值明显增高。结论：DMLI对大鼠心肌缺血再灌注损伤具有明显保护作用，可能与其增强抗氧化酶活性，减少自由基对心肌的氧化损伤，纠正PGI₂/TXA₂失衡等机制有关。

Protective effects of Diemailing Injection on myocardial ischemia-reperfusion injury in rats

Objective To observe the protective effects of Diemailing Injection (DMLI) on myocardial ischemia-reperfusion injury in rats. Methods The myocardial ischemia-reperfusion model was induced by 30 min left anterior descending coronary occulusion and 24 h reperfusion in open-chest anesthetized rats. The changes of aspartate aminotransferase (AST), lactate dehydrogenase (LDH), MB isoenzyme of creatine kinase (CK-MB), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities and malondialdehyde (MDA) contents in serum, and prostacycline (PGI2) and thromboxane A2 (TXA2) levels in plasma were determined. Results In rats treated by DMLI (with dose of 2. 5, 5 and 10 mL · kg-1 i. v. at 30 min after coronary occulusion), the myocardial ischemia size (MIS) was significantly reduced, the AST, LDH and CK-MB activities in serum and the TXA2 level in plasma were declined, while PGI2 level in plasma and PGI2/TXA2 ratio were increased significantly. In addition, the LPO content in serum declined, SOD and GSH-Px activities in serum were increased markedly. Conclusion DMLI has protective effects on myocardial ischemia-reperfusion injury through improving free radicals metabolism, decreasing TXA2 level in plasma, increasing PGI2 level in plasma and PGI2/TXA2 ratio.