葛根素对急性肺血栓栓塞溶栓治疗后再灌注损伤的影响

目的　探讨葛根素对急性肺血栓栓塞溶栓治疗后再灌注损伤的影响及作用机制。方法　 2 4只日本大耳白兔 ,随机分为假手术组 (S组 )、单纯溶栓组 (T组 )、葛根素组 (Pur组 ) ,经右心导管注入条柱状自体血栓 ,心导管法监测血流动力学 ,制备急性肺血栓栓塞实验模型。测定栓塞前、栓塞后2h、溶栓后 2h、4h血浆中超氧化物歧化酶 (SOD)、丙二醛(MDA)的含量 ;术毕肺组织行病理及电镜观察。结果　①T组和Pur组在溶栓开始后 1h ,PAMP即显著下降 (P <0 0 1) ;在溶栓开始后 1hPur组PAMP即明显低于T组 (P<0 0 5 )。②在栓塞后 2h、溶栓后 2h、4h时 ,T组和Pur组血浆SOD活力均明显低于栓塞前 (P <0 0 5 ) ,而MDA含量在栓塞后 2h无明显变化 ,在溶栓后 2h、4h才开始明显升高 (P <0 0 5 ) ;与T组同期比较 ,Pur组在溶栓后 2h、4h血浆SOD活力和MDA含量分别有明显升高和下降 (P <0 0 5 ,P <0 0 1)。③组织病理及超微结构研究显示 ,Pur组血管内皮细胞和肺泡上皮细胞损伤较T组明显减轻。结论　葛根素对急性肺血栓栓塞溶栓后再灌注损伤有保护作用 ,其机制可能与其抗氧化损害的作用有关。

Effect of puerarin on reperfusion injury after thrombolytic therapy in acute pulmonary thromboembolism

Aim To study the effect of puerarin on reperfusion injury after thrombolytic therapy in acute pulmonary thromboembolism and its mechanism. Methods Thirty-two Japanese rabbits were randomly divided into sham operation group (group S),Thrombolysis-only group(group T), and Puerarin group(group Pur). Acute pulmonary thromboembolism models of rabbits were established with injection of autologous blood clots through the right heart catheters,haemodynamic monitoring was performed by introducing heart catheter through right jugular vein.The activity of plasma superoxide dismutase (SOD) and content of plasma malondialdehyde (MDA) were detected before embolization,2 h after embolization,2 h and 4 h after thrombolysis. At the end,the rabbits were sacrificed and their lung,removed for histopathologic and electron microscopic investigations. Results ①Pulmonary arterial mean pressure (PAMP) were decreased at 1 hour after thrombolysis both in group T and group Pur(P<0.01), PAMP in group Pur wa s significantly lower than those in group T at 1 h after thrombolysis(P<0.05). ② The activity of SOD began to decline at 2 h after embolization both in group T and group Pur (P<0.05), the content of MDA began to increase at 2 h after thrombolysis(P<0.05); At 2 h and 4h after thrombolysis,the activity of SOD was higher(P<0.05,P<0.01) and the content of MDA was lower (P<0.05,P<0.01) in group Pur than those in group T.③Histopathologic analysis showed the injuries of endotheliums and type II alveolar cells in group T were more severe than those in group Pur.Conclusion Chinese herb puerarin can protect lung against reperfusion injury after thrompolytic therapy in acute pulmonary thrombembolism which may be associated with anti-oxidation action.