大鼠局灶性脑缺血再灌注后血管内皮细胞凋亡及其与P53表达的关系

目的 探讨大鼠局灶性脑缺血再灌注损伤后血管内皮细胞凋亡及其与P53蛋白表达的关系。方法 采用原位末端标记法和免疫组化法分别观察脑缺血再灌注2、6、12小时，1、2、3、7、14和21天血管内皮细胞凋亡和P53蛋白表达的变化。结果 脑缺血再灌注2小时在缺血周围区即有凋亡的内皮细胞出现，12－24小时达高峰，之后逐渐下降，至21天与假手术组已无显著性差异。脑缺血再灌注6小时在缺血周围区P53蛋白开始表达，1－2天达高峰，之后逐渐下降，至7天与假手术组已无显著性差异。P53蛋白表达高峰时间迟于内皮细胞凋亡24小时。结论 脑缺血再灌注损伤中凋亡是血管内皮细胞的死亡形式之一，P53蛋白表达参与缺血再灌注后血管内皮细胞凋亡机制的调节。

The apoptosis of endothelial cell and the relation between it and the expression of P53 after focal cerebral ischemia reperfusion in rats

Objective To study the apoptosis of endothelial cells and the relation between it and the expression of P53 protein after focal cerebral ischemia reperfusion in rats.Methods The apoptosis of endothelial cell 2,6,12 h and 1,2,3,7,14,21 d after cerebral ischemic reperfusion were observed using an in situ end labeling method,and the expression of P53 protein was detected by immunohistochemical staining methods.Results Apoptotic endothelial cells in ischemic penumbra were observed 2h after cerebral ischemic reperfusion, they peaked at 12~24 h, and decreased gradually.There was no remarkable difference between it and the sham operative group at 21 d.The P53 protein began to express 6h after cerebral ischemic reperfusion, it peaked at 1~2 d, and then declined gradually to controlled level at 7d. The expression peak time of P53 was 24 h later than that of cell apoptosis.Conclusion Apoptosis was a pattern of endothelial cell death after reperfusion of MCAO. P53 protein played an important role in the process of apoptosis of endothelial cells.