骨髓间质干细胞体外诱导分化为心肌样细胞的实验研究

目的：体外培养并诱导大鼠骨髓间质干细胞（MSCs）分化为心肌细胞。 方法： 采用密度梯度离心法和贴壁培养法分离、纯化大鼠骨髓MSCs，在第3代细胞以5-氮杂胞苷进行诱导，用免疫细胞化学和RT-PCR方法对诱导细胞进行鉴定。 结果： 诱导后细胞体积较诱导前增大，而且更加细长，呈长梭形。14 d后细胞之间出现连接，排列方向渐趋一致。免疫细胞化学染色显示诱导后部分细胞结蛋白(desmin)、横纹肌肌动蛋白(α-sarcomeric actin)和心肌特异性肌钙蛋白(troponin I)呈阳性反应。RT-PCR结果表明诱导细胞有心肌β肌球蛋白重链表达。 结论： 5-氮杂胞苷能在体外诱导MSCs向心肌细胞分化。

Experimental study on inducing bone mesenchymal stem cells to differentiate into cardiomyocytes in vitro

AIM: To study the differentiation of rat bone mesenchymal stem cells (MSCs) into cardiomyocytes in vitro. METHODS: MSCs were isolated and purified from the bone marrow of rats by density gradient centrifugation and adhering to the plastic culture. The third passage MSCs were treated by 5-azacytidine (5-aza). The induced cells were evaluated by immunocytochemistry staining and RT-PCR analysis. RESULTS: After being induced by 5-aza, some MSCs became bigger and longer. The connection of the cells were formed on day 14.The direction of the cells arraying was similar gradually. The induced cells were stained positively for desmin, α-actin and troponin I. RT-PCR showed that these cells expressed β myosin heavy chain. CONCLUSION: 5-aza can induce MSCs to differentiate into cardiomyocytes in vitro.