骨髓间充质干细胞建立的成骨细胞培养模型的研究

目的：为骨折骨缺损治疗的基础实验研究建立理想的细胞模型,观察兔骨髓间充质干细胞（BMSCs）在体外培养状态下的生长情况,对其向成骨细胞分化及分化能力进行研究.方法：采用全骨髓密度梯度离心法联合差速贴壁法从兔股骨骨髓中提取、分离、纯化BMSCs,取第3代BMSCs细胞分为两组进行培养,A组：为用含有诱导剂的低糖DMEM培养基的诱导培养组;B组：为常规培养组.倒置显微镜及HE染色观察记录各代次细胞形态等特征;CD44,CD90检测细胞表形,通过碱性磷酸酶（ALP）染色及标准化钙结节计数,鉴定细胞成骨活性.结果：兔骨髓间充质干细胞生长状态良好,培养7 d后各组细胞形态趋于一致,多呈长梭形,培养2 wk后对两组细胞进行ALP染色,可见A组细胞质内ALP染色阳性反应明显,B组染色显色弱.21 d时A组细胞茜素红染色后钙化结节数量多且较大,B组有少量钙结节形成,但较小.A组标准化钙结节计数显著高于B组差异具有显著统计学意义（P〈0.05）.结论：通过密度梯度离心法联合差速贴壁法所获得的BMSCs在常规培养或诱导培养时均可表现出成骨潜能,但诱导培养组的BMSCs的ALP活性更强,成骨能力更确切,可为骨组织工程远期实验研究提供理想的细胞模型.

Establishment and evaluation of rabbit osteoblast cell culture model based on BMSCs

AIM:To establish a cell culture model for bone disease research,investigate rabbit BMSCs' growth and differentiation in vitro.METHODS:Bone marrow mesenehymal stem cells were cultured by density gradient centrifugation and attachment,random select two group from the third generation.Group A:induced by low carbohydrates DMEM;Group B:negative group.The growth of rBMSCs was observed inverted-microscopically,CD44,CD90 were detected,also the HE and ALP stains,assess the activity of cell and counter the mineralize...