小鼠胎肝间质干细胞体外向肌样细胞分化的研究

目的：了解小鼠胎肝间质干细胞在体外向肌样细胞分化的潜能。 方法： 无菌条件下从正常C57BL/6J胎鼠肝脏中分离出间质干细胞，体外培养传3代后用5-氮胞苷和二性霉素B诱导分化，观察胎肝间质干细胞诱导前后形态变化；用RT-PCR检测细胞诱导前后, 成肌调控基因Myf5和成肌素myogenin的表达情况；诱导后7 d和 14 d 行免疫细胞化学染色鉴定诱导后细胞结蛋白和α-肌动蛋白的表达。 结果： RT-PCR显示诱导后6 h至72 h成肌调控基因Myf5和myogenin序贯表达，而诱导前的细胞则没有检测到表达；免疫细胞化学染色提示第7 d细胞结蛋白和α-肌动蛋白表达阳性，第14 d阳性率明显升高。 结论： 胎肝中分离出的间质干细胞在体外可以定向诱导分化为肌样细胞。

Differentiation of mesenchymal cells derived from mouse fetal liver into skeletal muscle-like cells in vitro

AIM: To study whether mesenchymal stem cells (MSCs) from fetal liver can differentiate into skeletal muscle-like cells. METHODS: MSCs were isolated from C57BL/6J mouse fetal liver and were induced by 5-azacytidine and amphotericin B. Myf5 and myogenin were tested by RT-PCR. Desmin and β-actin was examined by immunocytochemistry. RESULTS: RT-PCR showed that the treated cells expressed Myf5 and myogenin orderly from 6 hours to 72 hours, while the untreated cells did not. Immunocytochemistry confirmed that these cells were positive for desmin and β-actin and the positive rate was higher in 7 days than that in 14 days. CONCLUSION: MSCs derived from fetal liver can be induced into skeletal muscle-like cells in vitro.