【摘要】 目的 :建立体外定向诱导成人骨髓间质干细胞 (MSC)分化为成骨细胞的模型。方法 :采用Ficoll-Paque淋巴细胞分离液分离成人MSC ,体外扩增 ,流式细胞仪检测细胞表面抗原的表达 ,应用地塞米松、β -甘油磷酸钠、vitaminC定向诱导MSC分化为成骨细胞 ,检测碱性磷酸酶 (AP)活性、钙沉积、骨桥蛋白的表达鉴定成骨细胞 ,比较P3和P10代MSC成骨分化的能力。结果 :MSC在体外扩增原代可获得 (5 - 6 )× 10 5个细胞 ,10代可获得 2× 10 10个细胞。流式细胞仪检测结果显示CD2 9、CD4 4、CD5 9、CD10 5、CD16 6表达阳性 ,CD11a、CD14、CD33、CD34、CD4 5、CD38、CD80、CD86、CD117表达为阴性。加入成骨诱导剂 ,细胞形态发生变化 ,AP活性增强 ,骨桥蛋白表达阳性 ,钙沉积逐渐出现。P3和P10代的MSC均有良好的分化为成骨细胞的能力。结论 :成人骨髓间质干细胞在体外可分化为成骨细胞。更多还原

【Abstract】 AIM: To investigate the differentiation from human mesenchymal stem cells (hMSC) into osteoblasts. METHODS: MSC were separated from human marrow with Ficoll-Paque reagent and expanded in cuture medium. To detect the surface antigens, The labeled cells were analysed on a FACScan flow cytometer. hMSC were induced to differentiate from mesenchymal stem cells into osteoblasts with dexamethasone, vitamin C, β-GP. Cell morphology?AP activity?calcium deposition and osteopontin were detected. P10 MSC were compared to P3 MSC in the tendency of osteoblastic differentiation. RESULTS: The cultured MSC comprised a single phenotypic population and displayed a fibroblast-like morphology. hMSC showed a strong self-renewal capacity. After primary culture, approximately (5-6)×10 5 cells were obtained. These expanded attached MSC were uniformaly positive for CD29,CD44,CD59,CD105,CD166 and didn’t express CD11a, CD14, CD33, CD34, CD45, CD38, CD80, CD86, CD117. After osteoblasts induction, the cells changed from spindle-shape to cuboidal and polygonal in cell morphology. The AP activity increased gradually and many scattered calcium nodes were observed. The expression of osteopontin was positive. CONCLUSION: hMSC can be induced to differentiate into osteoblasts.更多还原