Sox9基因转染对骨髓间充质干细胞成软骨分化的影响

目的 探讨Sox9基因转染对骨髓间充质干细胞(MSCs)成软骨分化的影响.方法 采用密度梯度离心和贴壁培养法分离兔骨髓MSCs,体外培养扩增.阳离子脂质体介导重组真核表达Sox9质粒转染骨髓MSCs,通过反转录-聚合酶链反应(RT-PCR)和蛋白印迹实验(Westem blot)的方法检测基因产物的表达,荧光显微镜和流式细胞术测定细胞转染效率;四甲基噻唑蓝(MTT)法测定基因转染对细胞增殖能力的影响,流式细胞术对转基因细胞进行细胞周期分析;通过Westem blot,RT-PCR和免疫组织化学染色的方法检测Sox9基因转染对MSCs成软骨分化的影响.结果 脂质体介导Sox9基因可以成功地转染兔骨髓MSCs;Sox9基因转染对细胞增殖能力无明显影响;基因转染后的细胞表达软骨分化特异性分子Ⅱ型胶原,Sox9,aggrecan等明显增加.结论 Sox9基因转染骨髓MSCs可以获得稳定表达,基因表达产物可以促进骨髓MSCs向软骨方向的分化.

Chondrogenesis of rabbit mesenchymal stem cells by overexpressing Sox9 gene

Objective To observe the effect of Sox9 gene overexpressian on chondrogenesis of esenchymal stem ceils (MSCs) in vitro. Methods Rabbit MSCs were obtained and purified by gradient centrifuge and adhesion culture in vitro. MSCs were transfected by recombinant Sox9 plasmid. RT-PCR and Western blot analysis were used for transfection confirmation. Chondrogenic molecules such as type I1 collagen,aggrecan and Sox9 were detected by immunohistology, RT-PCR and western blot. Cell proliferation was tested by MTT assay. Results MSCs were successfully transfected with Sox9 gene and verified by RT-PCR and Western blot analysis. The overexpression of Sox9 had no effect on the proliferation of MSCs. Transfeeted cells expressed more chondrogenic markers than the control groups. Conclusion Sox9 gene overexpression can enhance chondrogenic differentiation of MSCs.