三七总皂苷对大鼠局灶性脑缺血再灌注损伤有效治疗时间窗研究

目的:研究三七总皂苷对大鼠局灶性脑缺血再灌注损伤有效治疗时间窗.方法:采用大鼠大脑中动脉阻断(MCAO)局灶性脑缺血2 h再灌注24 h模型,分别在缺血开始3 h、4 h、5 h和6 h腹腔注射给药,再灌注24 h,评价大鼠神经功能状态、脑水肿、脑梗死范围.结果:缺血开始后3～4 h给药,大鼠神经功能行为评分和脑组织含水量明显减少,脑梗死体积缩小;缺血5 h时三七总皂苷经腹腔注射,疗效下降;缺血开始后6 h给药无明显作用.结论:三七总皂苷对大鼠局灶性脑缺血再灌注损伤有效治疗时间窗不超过5 h.

Study on Therapeutic Window of Opportunity for Panax notoginseng Saponins Following Focal Cerebral Ischemia/Reperfusion Injury in Rats

OBJECTIVE: To study the therapeutic window of opportunity for Panax notoginseng saponins (Pns) following focal cerebral ischemia/reperfusion injury in rats. METHODS: Focal cerebral ischemia (2 h)/reperfusion (24 h) model in male rats was induced by transient occlusion and middle cerebral artery (MCA) for 2 h and reperfusion for 24 h. Drugs were administered at 3 h, 4 h, 5 h and 6 h after the onset of ischemia respectively and neurological deficit score, infarct size and brain edema were examined. RESULTS: The administration of Pns at 3-4 h after onset of ischemia significantly reduced neurological deficit score, infarct size and brain edema. When administrating Pns at 5 h after onset of ischemia, the neuroprotection decreased. When administrating Pns at 6 h after onset of ischemia, there are not significant protective effects. CONCLUSION: The therapeutic window of opportunity for Pns following focal cerebral ischemia/reperfusion injury in rats is not more than 5 h after the onset of ischemia.