大鼠大脑中动脉缺血后海马星形胶质细胞反应的研究  

Astrocyte proliferation in the rat hippocampus after middle cerebral artery occlusion

作　　者：张梁[1] 王伟[2] 阮旭中[2] 

机构地区：[1]浙江大学医学院附属第二医院神经内科,浙江杭州310009 [2]华中科技大学同济医学院附属同济医院神经内科,湖北武汉430030

出　　处：《中国病理生理杂志》2004年第9期1553-1556,共4页Chinese Journal of Pathophysiology

基　　金：国家自然科学基金重点资助项目(No.30230140)

摘　　要：目的观察大鼠大脑中动脉缺血后皮层损伤侧海马星形胶质细胞反应的变化。方法采用大鼠大脑中动脉阻塞再灌流模型,应用免疫印迹和免疫组织化学方法测定脑缺血后3d、7d以及30d皮层损伤侧海马胶质纤维酸性蛋白(GFAP)以及增殖细胞核抗原(PCNA)蛋白的表达,观察星形胶质细胞增殖的变化。结果GFAP免疫组化结果显示,脑缺血后7d皮层损伤侧海马CA1、CA2区星形胶质细胞数量较假手术组增加且胞体增大;脑缺血后30d皮层损伤侧海马CA1、CA2区呈胶质疤痕样改变。同时,免疫印迹法显示脑缺血后7d皮层损伤侧海马GFAP表达增强;脑缺血后30d皮层损伤侧海马GFAP表达增高更加明显。此外,免疫印迹法显示脑缺血后3d皮层损伤侧海马PCNA蛋白表达水平升高;脑缺血后7dPCNA蛋白表达水平达到峰值;脑缺血后30d,PCNA蛋白表达水平降低,但仍高于假手术组。结论大鼠大脑中动脉缺血后可引起其皮层损伤侧海马星形胶质细胞过度反应和增殖。AIM: To study rat astrocyte proliferation in ipsilateral hippocampus following focal cerebral ischemia. METHODS: Ischemia was induced by temporary middle cerebral artery occlusion (MCAO). In hippocampus of rats at 3, 7 and 30 days after MCAO, the numbers and anatomic distribution of glial fibrillary acidic protein (GFAP) were detected by immunohistochemistry. The protein expression of GFAP and proliferating cell nuclear antigen (PCNA) in the ipsilateral hippocampus were analyzed by Western blot analysis. RESULTS: Astrocytes appeared hypertrophic, with increased process thickness and numbers at 7 days after MCAO, and the highest density of astrocytes were seen at 30 days in the CA1, CA2 regions of the ipsilateral hippocampus. Western blot analysis revealed that GFAP levels were normal at 3 days, but increased by 7 days and remained elevation at 30 days. Western blot analysis of PCNA protein also revealed identified upregulation PCNA at 3 days after MCAO and the expression peaked at 7 days. CONCLUSION: This study demonstrates that focal cerebral ischemia in the rat results in a rapid response, a process often referred to as reactive astrogliosis or glial scarring, from resident astrocytes of the ipsilateral hippocampus to the side of ischemia. [

关 键 词：脑缺血 星形细胞 增殖细胞核抗原 神经胶质原纤维酸性蛋白质 海马 

分 类 号：R743.3[医药卫生—神经病学与精神病学]