【摘要】 应用免疫组化和免疫荧光双标技术结合激光共聚焦扫描显微镜,观察缺血性脑损伤后脑内nestin的表达及其细胞类型。实验观察结果为,再灌后1天,在缺血中心区可见nestin阳性突起;再灌后3天和1周时,除缺血中心区外,周边Ⅰ、Ⅱ、Ⅲ区均有nestin大量表达;而2周时仅限于周边Ⅰ区大量表达。激光共聚焦扫描显微镜观察到,再灌后3天,周边Ⅰ区 nestin阳性突起主要与GFAP共存;2周时,nestin阳性突起变粗、变长,并与NSE的共存明显增多。上述研究结果提示,脑缺血可诱导大鼠脑缺血区域表达nestin,该表达可能与神经细胞的修复有关。更多还原

【Abstract】 Immunohistochemistry and double immunofluorescent labeling techniques combined with confocal laser scanning microscope analysis were used to investigate the characteristic spatial induction profile of nestin following a transient middle cerebral artery occlusion in adult rat brain. The results showed that nestin was induced in ischemic core at 1 day after reperfusion. In addition to ischemic core, the expression of nestin increased in peri-ischemic Ⅰ, Ⅱ and Ⅲ regions at 3 days and 1 week, then it decreased and narrowed along the rim of ischemic core 2 weeks after reperfusion. Double immunofluorescent labeling showed that nestin positive cells were mostly co-stained with GFAP, a astrocyte marker, in peri-ischemic I region 3 days after reperfusion. At 2 weeks, however,nestin cells showed a long process and the cells double stained with nestin and NSE, a neuonal specific marker, increased in the ischemic brain. The results suggest that cerebral ischemia induces nestin expression in damaged neurons, which might favor the neuroprotection against ischemic damage.更多还原