人参总皂苷对人胚胎神经干细胞增殖及定向诱导为多巴胺能神经元的影响

目的：探讨人参总皂苷(TSPG)对人胚胎神经干细胞(NSC)增殖和分化为多巴胺(DA)能神经元的影响。方法：从7～12周人工流产胚胎脑组织中分离培养人胚胎NSC,免疫细胞化学鉴定NSC特异性nestin抗原表达,在NSC的培养体系中加入TSPG,采用流式细胞术和MTT法检测不同浓度TSPG以及TSPG与EGF,bFGF联合应用对人胚胎NSC增殖的影响；经免疫细胞化学检测培养细胞酪氨酸羟化酶(TH)表达,分析不同浓度TSPG以及TSPG与IL-1联合应用对NSC定向诱导为DA能神经元的影响。结果：TSPG对NSC的增殖有促进作用,TSPG与EGF、bFGF联合应用的促增殖作用是EGF和bFGF联合应用时的2倍；TSPG能促进神经干细胞定向分化为DA能神经元,TSPG与IL-1联合诱导的效果是单用IL-1的5倍。结论：TSPG能促进人胚胎NSC的增殖,并能诱导NSC向DA能神经元分化。

Effect of TSPG on proliferation and differentiation of human embryonic neural stem cell into dopaminergic neuron

Objective: To investigate the effects of total saponins of panax ginseng (TSPG) on proliferation and differentiation of human embryonic neural stem cell(NSC) into dopaminergic neuron. Method: Isolation, cultivation and identification of human embryonic NSC from cerebral cortex of 7-12 week abortus. By using flow cytometry and MTT assay, the effects of various concentration of TSPG and TSPG cooperating with cytokines(EGF, bFGF) in NSC culture media for 3 days on proliferation of human embryonic NSC has studied. By employing immunocytochemistry assay of the expression of tyrosine hydroxylase (TH), the effect of different dilution of TSPG and TSPG cooperating with IL-1 on induced differentiation of human embryonic NSC into dopaminergic neuron has researched. Result: TSPG can significantly promote the proliferation of NSC. When TSPG cooperating with EGF and bFGF, the proliferation of NSC is much stronger than that of only using FGF and bFGF. TSPG also induces NSC to differentiate into dopaminergic neuron, especially when TSPG is cooperating with IL-1. Conclusion: TSPG can not only obviously accelerate the proliferation of NSC, but also significantly induce differentiation of NSC into dopaminergic neuron.