新生鼠缺氧缺血后海马CA1区脑源性促红细胞生成素的表达及意义
首发时间:2008-03-07
摘要:目的 探讨新生鼠缺氧缺血后海马CA1区脑源性促红细胞生成素(EPO)的表达变化,推论脑缺氧缺血后内源性因素启动海马神经发生的机制。方法 选用144只7日龄SD大鼠,随机分为4组:正常对照组(C)、单纯缺血组(I)、单纯缺氧组(H)、缺氧缺血组(HI),每组又分为1小时,6小时,16小时,1天,3天和7天共6个时间点。分别行HE染色和EPO免疫组织化学法观察。结果 各组别EPO表达均有差异(F=387, p<0.0001),以缺氧缺血组最多; EPO表达有时间消长规律,各时间点差异有统计学意义(F=53, p<0.001),脑缺氧缺血后16h,海马CA1区脑源性EPO表达达到较高水平,以后随时间延长逐渐下调。结论 脑源性EPO表达在新生脑缺氧缺血后增加,受低氧影响最明显;EPO表达高峰在缺氧后早期,推测低氧、EPO早期高表达可能是参与海马神经发生的内源性因素之一。
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Expression of Brain-derived Erythropoietin in Hippocampal CA1 Region after Hypoxic-ischemic Brain Damage in Neonatal Rats and its Significance
Abstract:Objective To examine the expression of brain-derived erythropoietin in the hippocampus of neonatal rats with hypoxic-ischemic brain damage (HIBD), and deduce the neurogenesis in the hippocampus triggered by endogenous factors after HIBD . Method One hundred and forty-four Sprague-Dawley(SD) rats aged 7 days old were randomly divided four groups: Control(C), Ischemia(I), Hypoxia(H) and Hypoxia-ischemia(HI) groups. Every group was observed at 1h, 6h, 16h, 1d, 3d and 7d time points respectively with 4 rats in control and Hypoxia group and with 8 rats in Ischemia and Hypoxia-ischemia group. Immunohistochemical staining is used to identify the expression of brain-derived erythropoietin in the hippocampus CA1 at every time point after HIBD. Result There is a significant difference of the expression of brain-derived erythropoietin in every group, and the most is in hypoxia-ischemia group(P<0.0001).The expression of brain-derived erythropoietin was detected in Hippocampal CA1 Region at 1h time point after HIBD, reached its peak level at 16h after HIBD, and decreased after that(P<0.001). Conclusion The expression of brain-derived erythropoietin is induced due to hypoxia. We postulate that hypoxia , overexpression of erythropoietin early is probably one of endogenous factors that involve in the neurogenesis in neonatal hippocampus after HIBD.
Keywords: Erythropoietin Neurogenesis Neonatal;Hypoxic-ischemic; Hippocampus
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