视黄酸和硷性成纤维细胞生长因子对神经干细胞增殖和分化的影响

目的:研究视黄酸(RA)、硷性成纤维细胞生长因子(bFGF)对体外培养的神经干细胞(NSCs)分裂增殖和分化的作用。方法:分离培养新生SD大鼠大脑皮层NSCs,采用不同组合配方的培养液培养细胞,利用MTT法检测其对NSCs存活和增殖的影响;利用免疫荧光鉴定和分化细胞的分类计数法,判定bFGF、RA等对NSCs分化的影响。结果:MTT实验表明,bFGF组、bFGF+RA组以及RA组均能促进NSCs增殖,其中bFGF作用最明显,bFGF+RA次之,RA最弱。RA处理组经诱导分化后产生的神经元是bFGF组及对照组的2～3倍。结论:bFGF对NSCs增殖及较长期存活具有重要的作用,同时抑制其分化;RA可以部分抵消bFGF的促有丝分裂和分化抑制作用,并促进NSCs向神经元方向分化。

INFLUENCE OF RETINOIC ACID AND BASIC FIBROBLAST GROWTH FACTOR ON PROLIFERATION AND DIFFERENTIATION OF NEURAL STEM CELLS

Objective:To study the effect of retinoic acid (RA) and basic fibroblast growth factor (bFGF) on neural stem cells’(NSCs) proliferation and differentiation from new born rats’ pallium. Method: NSCs were isolated from the brains of new born Sprague-Dawley rats’ pallium, and the features of cells were characterized by immunofluorescence staining. The effects of different culture medium on survival and proliferation of cells were determined by MTT assay. The effects of bFGF and RA on differentiation of NSCs were observed. Results: MTT assay indicated the proliferation of cells in bFGF group, bFGF+RA group and RA group was continually increased, highest in bFGF group. The percentage of neurons differentiated from NSCs in RA group was 2 or 3 times that in bFGF group and control group . Conclusion: bFGF is important to the proliferation and long-term living of NSCs. It can prohibit the differentiation of NSCs. RA can counteract the effects of bFGF and also promote NSCs to differentiate into neurons in vitro.