Abstract

目的 动态观察大鼠持续性局灶脑缺血后星形胶质细胞的形态学变化,探讨星形胶质细胞的死亡方式.方法将48只SD大鼠随机分为免疫组化组、免疫组化对照组、电镜实验组和电镜实验对照组.采用颈内动脉线栓并环扎的方法建立持续性局灶脑缺血模型.免疫组化组和电镜实验组大鼠按照缺血时间(3h、6h、12h、24h、48h)平均随机分为5个亚组.对照组为术后24h取脑.免疫组化标本采用HE染色及TUNEL-GFAP双染.电镜标本在中心区、边缘区分别取材、染色后,透射电镜观察.结果随着时间的延长,脑缺血中心区及边缘区星形胶质细胞逐渐出现核肿胀、染色质分散、边聚、空泡变,核膜破溃,染色质溢出.随着缺血时间延长,中心区GFAP阳性细胞数逐渐减少,直至基本消失.缺血边缘区则可见到GFAP阳性细胞数量逐渐增多.TUNEL-GFAP双染未见阳性细胞.结论持续局灶脑缺血后,星形胶质细胞未见凋亡,推测胀亡是星形胶质细胞主要的死亡方式。

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