【摘要】 目的探讨人脐血干细胞定向分化为多巴胺(DA)能神经元的最佳诱导条件。方法体外分离、原代培养人脐血干细胞,流式细胞仪检测其表面标志,分别以EGF+bFGF、ATRA、ATRA+EGF+bFGF、纹状体条件培养液、纹状体星形胶质细胞条件培养液对其进行诱导,倒置相差显微镜观察细胞形态的变化。应用免疫荧光染色技术检测DA能神经元标志物酪氨酸羟化酶(TH)的表达。结果比较各组对人脐血干细胞定向分化为DA能神经元的诱导作用,纹状体星形胶质细胞条件培养液>纹状体条件培养液>ATRA+EGF+bFGF组>ATRA组>EGF+bFGF组>对照组。结论纹状体组织对人脐血干细胞定向分化为DA能神经元的诱导作用优于其他各组,并且此作用可能主要源于纹状体的星形胶质细胞。更多还原

【Abstract】 Objective To investigate and compare some conditions which could induce human umbilical cord blood(HUCB) stem cells to differentiate into dopaminergic neurons,and probe the optimal condition for the directional differentiation of HUCB stem cells. Methods HUCB stem cells were isolated and cultured in vitro,and the cell surface markers were detected by flow cytometry,and when the cells were co-cultured with EGF+bFGF,ATRA,ATRA+EGF+bFGF,striatal conditioned medium(CM)、striatal astrocytes conditioned medium(CM) respectively,the morphological character was observed by inverse phase-contrast microscopy.The expression of tyrosine hydroxylase(TH) was detected by immunofluorescence staining method. Results The comparison of the results of HUCB stem cells which directly differentiated into dopaminergic neuron showed that the differentiation potential of striatal astrocytes CM group>striatal CM group>ATRA+EGF+bFGF group>ATRA group>EGF+bFGF group>control group.Conclusion Compared with other conditions,the striatum has a more distinct inductive effect on HUCB stem cells to differentiate into dopaminergic neurons,and the inductive effect mainly comes from the astrocytes in the striatum.更多还原