莽草对大鼠大脑中动脉血栓所致局部脑缺血性损伤的拮抗作用

目的：研究莽草酸（ＳＡ）对大脑中动脉血栓所致局部脑缺血的影响。方法：用三氯化铁局部涂抹损伤血管形成的大鼠大脑中动脉血栓模型（ＭＣＡＴ）观察ＳＡ对行为障碍程度、脑梗塞范围、脑水肿和缺血区脑血流的影响。结果：ＳＡ２５、５０ｍｇ．ｋｇ＾－１ｉｐ于ＭＣＡＴ前连续红药３ｄ可分涉及了梗塞范围５１％、４２％，使脑含水量由８０．７％降致７９．８％、７９．９％，并可改善行为障碍程度和缺血区脑血流量的降低，病理检查显

dl-3-n-butylphthalide attenuates reperfusion-induced blood-brain barrier damage after focal cerebral ischemia in rats.

AIM: To study the protective effect of dl-3-n-butylphthalide (NBP) on blood-brain barrier (BBB) damage induced by reperfusion following focal cerebral ischemia. METHODS: Focal cerebral ischemia in rats was performed by inserting a nylon suture into intracranial segment of internal carotid artery to block the origin of middle cerebral artery and reperfusion by withdrawing the nylon suture. Permeability of BBB was determined by extravasation of the protein-bound Evans blue dye to cerebral cortex and further evaluated by immunohistochemical or electronmicroscopic method. RESULTS: Reperfusion for 3 h following focal cerebral ischemia for 3 h produced BBB damage which exhibited the increase in extravasation in cerebral cortex, elevation of the expression of immunoglobulin (IgG), and pore formation in endothelial cell membrane of capillary in cerebral cortex. NBP (5-20 mg.kg-1) decreased the extravasation in a dose-dependent manner. The expression of IgG in cerebral cortex was decreased and the ultrastructure damage of capillaries was alleviated after treatment with NBP. NBP 20 mg.kg-1 also alleviated brain edema caused by 3-h reperfusion following 3-h middle cerebral artery occlusion (MCAO). CONCLUSION: NBP has protective effect on BBB damage induced by reperfusion after MCAO.