摘要
目的 探讨人不同胎龄胎脑海马部位神经干细胞的发育规律。方法 收集胎龄 16～ 3 2周的水囊引产胎儿10 0例 ,采用免疫组织化学和光镜技术对人胎脑海马部位神经干细胞的分布、形态、存在方式以及数量进行检测。结果 不同胎龄胎脑海马均存在神经干细胞 ,神经干细胞位于海马多形细胞层、锥体细胞层、颗粒细胞层及分子层 ,以多形细胞层、锥体细胞层及颗粒细胞层多见。细胞呈圆形、椭圆形、三角形及星形 ,以圆形和椭圆形多见 ,未见明显突起。细胞胞浆丰富 ,核呈圆形及椭圆形 ,染色质疏松 ,2～ 6个核仁不等。多数单个散在分布于其它神经元间 ,可见对称分裂现象 ,但有的神经干细胞呈簇状及群状分布 ,各组神经干细胞随着胎龄的增加呈减少趋势。结论 人不同胎龄胎脑海马广泛存在神经干细胞 ,各胎龄神经干细胞在分布部位、形态、存在方式及数量上存在一定的差异 ,海马可能是神经干细胞新的生发区。
Objective To study the development of neural stem cells from human fetal brains at different developmental stages. Methods A total of 100 cases of embryos at 16-32 gestational weeks by induction of labor with water bag were collected for the determination of the distribution, forms, existing modes, and the number of neural stem cells in the hippocampus by SABC immunohistochemical method and light microscopy. Results Neural stem cells were found in the hippocampus at different fetal ages and located in the polymorphic layer, pyramidal, granular and molecular layers of hippocampus, mainly in polymorphic layer, pyramidal layer, and granular layer. Neural stem cells in hippocampus were round, ellipse, triangle, and stellate, particularly round and ellipse. No obvious enation was found. Neural stem cells had plenty of cytoplasm. The nuclei were round and ellipse with rare chromatin and nucleoli from 2 to 6. Most of neural stem cells were distributed among other neurons, and symmetric cleavage was found in some of them, but some neural stem cells were distributed in cluster and nest. The number of neural stem cells in hippocampus were different between groups and gradually decreased with the increasing gestational age. Conclusion Neural stem cells exist widely in the hippocampus at different gestational ages. There are differences in distribution, forms, existing modes, and number of neural stem cells in hippocampus at different gestational ages. Hippocampus may be the new originating region of neural stem cells.
出处
《第三军医大学学报》
CAS
CSCD
北大核心
2004年第22期2061-2063,共3页
Journal of Third Military Medical University
基金
广东省科技联合攻关项目 (B30 50 2 )~~
