神经生长因子、Noggin基因转染对骨髓间充质干细胞分化的影响

Gene transfection of NGF and/or Noggin affecting the differentiation of bone marrow-derived mesenchymal stem cells

目的 研究外源性神经生长因子（NGF]、Noggin转染骨髓间充质干细胞（BMSCs）的可行性,并观察基因修饰的细胞向神经元方向的分化情况.方法 采用贴壁法分离纯化BMSCs,通过细胞表面标志及成脂诱导鉴定细胞.Ad-GFP-NGF、Ad-GFP-Noggin单独及联合转染BMSCs.通过Westernblot、免疫细胞化学观察目的 蛋白表达.通过免疫组化观察转染后BMSCs向神经元方向分化情况.结果贴壁法获得的细胞具有BMSCs表型,能分化为脂肪细胞.未转染组和Ad-GFP转染组少量表达NGF,不表达Noggin.NGF、Noggin单独及联合转染BMSCs均能高效表达目的 蛋白.NGF、Noggin转染的BMSCs可分化为具有神经元形态,并表达神经丝蛋白（NF-H）的细胞,联合转染组NF-H阳性细胞比例最高.结论 贴壁法能有效纯化BMSCs,Ad-GFP-NGF、Ad-GFP-Noggin单独及联合转染BMSCs安全并能高效表达目的 蛋白,NGF、Noggin转染的BMSCs 体外培养能向神经元样细胞方向分化,两种蛋白联合修饰能增强这种分化作用.

Objective To explore the feasibility of exogenous NGF and/or Noggin gene transfecting into the bone marrow-derived mesenchymal stem cells （BMSCs） and observe the differentiation of BMSCs modified by NGF and/or Noggin.Methods BMSCs were isolated from SD rat and purified by adherent method and these cells were identified by their phenotypical properties and their abilities of differentiating into adipocytes.Ad-GFP-NGF and/or Ad-GFP-Noggin were transfected into BMSCs.The protein expressions of NGF and/or Noggin were detected using immunocytochemistry and Western blotting.The differentiations of gene modified BMSCs were observed by immunohistochemistry.Result The cells selected by adherent method had basic phenotypical properties of BMSCs and could differentiate into adipocytes.BMSCs without transfection and those transfected with Ad-GFP expressed low level of NGF without Noggin expression.All gene modified BMSCs could express NGF and/or Noggin.After transfection, BMSCs could differentiate into cells having neuronal morphology and expressing NF （H）.The combined transfection group had the highest ratio of NF（H）＋ cells among all the groups.Conclusion BMSCs can be isolated and purified from rat bone marrow by adherent method.Ad-GFP-NGF and/or Ad-GFP-Noggin can transfect BMSCs safely and the transfected cells can express those proteins persistently and efficiently.NGF and Noggin can induce BMSCs into neuron-like cells in vitro and when they exist simultaneously,the differentiation is further enhanced.