新生大鼠HIBD后海马增殖细胞分化和bFGF的相关性探讨

目的: 观察新生大鼠缺氧缺血性脑损伤(HIBD)后海马齿状回增殖细胞分化情况,及碱性成纤维细胞生长因子(bFGF) 干预对其的影响,探讨实验大鼠的远期行为学变化.方法: 7日龄SD大鼠随机分为假手术组、缺氧缺血组和bFGF干预组,建立HIBD模型(假手术组不予缺氧处理),分别于术后5、10、14、21 d取脑,采用免疫荧光双标记观察大鼠海马齿状回BrdU/MAP-2、BrdU/GFAP阳性细胞表达,并应用Y-迷宫法进行行为学测定.结果: 缺氧缺血组及bFGF干预组BrdU/MAP-2、BrdU/GFAP阳性细胞于术后10、14 d较5 d时有所升高(P＜0.05),21 d下降至5 d时的水平.与假手术组及缺氧缺血组比较,bFGF干预组于HIBD后各个时间点BrdU/MAP-2、BrdU/GFAP阳性细胞均有所增加(P＜0.05).Y-迷宫测试显示bFGF干预组学习记忆能力较缺氧缺血组有所提高(P＜0.05).结论: HIBD后海马齿状回增殖细胞存在分化为神经元及星形胶质细胞的现象,bFGF能够促进HIBD后海马齿状回增殖细胞向神经元及星形胶质细胞分化,并可以改善大鼠后期行为记忆能力.

Relationship between the hippocampal cell proliferation and differentiation in dentate gyrus and bFGF after hypoxic-ischemic brain damage in the neonatal rats

Objective To observe the relationship between the hippocampal proliferation and differentiation in dentate gyrus and basic fibroblast growth factor(bFGF) after hypoxic-ischemic brain damage(HIBD) in the neonatal rats and to explore the behavior capability.Methods The neonatal HIBD model was established with 7-day-old rat pups,and randomly divided into the sham group,the hypoxia-ischemia group and the bFGF group.Rats were killed on day 5,10,14 and 21 after operation,respectively.The slices of the brains were...