激光共聚焦显微镜观察脑缺血大鼠小胶质细胞的变化

目的观察大鼠局灶性脑缺血后不同时段小胶质细胞的变化,探讨小胶质细胞与脑缺血的关系.方法应用微创开颅法建立大鼠大脑中动脉闭塞（MCAO）模型,将27只大鼠随机分为2、6、12 h及1、2、3 d和1周共7个缺血组（n=3）,正常对照组和假手术组（n=3）.用lectin（一种小胶质细胞的标记物）荧光标记小胶质细胞,激光共聚焦显微镜观察大鼠局灶性脑缺血后其缺血中央区、缺血半暗区及正常灌注区小胶质细胞的变化.结果正常对照组和假手术组小胶质细胞体积小,呈分支状,在大脑皮质均匀分布.脑缺血后,在缺血中央区可见大量坏死细胞;在缺血周围正常灌注区及对侧脑组织,可见体积小、呈分支状的小胶质细胞,与对照组小胶质细胞形态相似,为静息状态的小胶质细胞;在缺血与正常组织交界区即缺血半暗区可见大量胞体增大,突起变短、变少的灌木样细胞,甚至变为胞体呈圆形,突起消失,呈＂阿米巴样＂的细胞,为激活的小胶质细胞,这些细胞在缺血后2、6、12 h数量很少,1 d后逐渐增多,3 d～1周数量最多,达高峰.结论脑缺血后有小胶质细胞的大量聚集和激活,小胶质细胞的活化、增殖规律可能与迟发性神经元损伤有关.

Changes of Microglia Following Cerebral Ischemia in Adult Rats with Laser Scanning Confocal Microscope

Objective To observe the changes of microglia after focal cerebral ischemia in different times in adult rats and explore the relationship between microglia and cerebral ischemia.Methods We established the middle cerebral artery occlusion model with minimally invasive open skull operation in adult rats.27 adult male rats were randomly divided into 9 groups(n=3)including 7 ischemia groups(2 h,6 h,12 h,1 d,2 d,3 d,1 w),a normal control group and a sham-operat group.Have been fluorescented by the lectin,a marke...