【摘要】 目的 :探讨胞外信号调节激酶 (ERK)信号传导途径对骨髓间质干细胞 (MSC)分化为成骨细胞的影响。方法 :采用Ficoll-Paque淋巴细胞分离液分离成人MSC ,体外扩增 ,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。在成骨诱导液中加入不同剂量的PD980 59,观察其对成骨细胞形成的影响。结果 :MSC体外扩增 1 5代可获得 (3 - 4 )× 1 0 1 2 个细胞。在成骨诱导液作用下 ,MSC可在体外定向分化为成骨细胞。不同剂量的PD980 59均可抑制MSC分化为成骨细胞 ,并有剂量依赖关系 ;同时促使部分细胞转化为脂肪细胞。结论 :ERK信号传导途径可能在MSC分化为成骨细胞和脂肪细胞过程中起关键作用更多还原

【Abstract】 AIM: To investigate the effects of PD98059 on the differentiation from mesenchymal stem cells to osteoblasts.METHODS: hMSC were separated from human marrow and expanded in cuture medium. hMSC were induced with dexamethasone, β-glycerophosphate, vitamin C which acted as osteoblast differentiation inducer. PD98059 was added into the osteoblasts induction medium. The cells were assayed with cell morphology, alkaline phosphatase (AP) activity and calcium deposition. RESULTS: The isolated cultured MSC comprised a single phenotypic population and displayed a fibroblast-like morphology. After induced with osteoblasts induction medium, the cells showed changes in cell morphology from spindle-shape to cuboidal and polygonal. The AP activity increased gradually and reached the peak in 12 days, then decreased. Many scattered tangerice calcium nodes were observed. PD 98059 significantly inhibited AP activity and calcium deposition in a dose-dependent manner. A striking observation of the present study was that a few adipocytes appeared in cultures that were treated with PD 98059 and osteogenic differentiation medium. CONCLUSION: These results indicated that osteogenic diferentiation from the hMSCs was related to the activation of the ERK.inCwhichactedasost更多还原