肝细胞生长因子诱导骨髓间质干细胞分化为心肌细胞

Bone marrow mesenchymal stem cells are induced to differentiate into cardiomyocytes by hepatocyte growth factor in vitro

目的 :探讨肝细胞生长因子 (HGF)体外诱导骨髓间质干细胞 (MSC)定向分化心肌细胞的一种新方法。方法 :分离SD大鼠骨髓MSC ,培养至 4 - 6代后 ,添加HGF(终浓度 10 μg/L)持续培养 30d ,倒置显微镜下动态观察分化细胞的自律性搏动和对 0 1%异丙肾上腺素和无Ca2 + 孵育液的反应 ,并行心肌肌凝蛋白表达鉴定。结果 :分化第 14 - 2 0d骨髓间质干细胞增殖形成集落 ,10 % - 5 0 %克隆中开始出现持续节律收缩的细胞群体 ,节律频率为 70- 90次 /min ,异丙肾上腺素加快其搏动速率 ,无Ca2 + 孵育液则抑制之。细胞心肌肌凝蛋白表达鉴定为心肌细胞。结论 :HGF可诱导骨髓间质干细胞分化为心肌细胞 。

AIM: To explore a new method of hepatocyte growth factor (HGF) inducing bone marrow mesenchymal stem cells (MSC) to differentiate into cardiomyocytes. METHODS: Bone marrow MSC was cultured with DMEM media (10% fetal calf serum) 4-6 passages, and induced by HGF (10 μg/L) for 30 d. Automatical beating of the differentiated cells was observed daily with transverse microscopy, or under condition of 0.1% isoproterenol or cal (cium-deprived) incubation. Specific cardiac myosin in the cells was indentified by immunochemistry. RESULTS: At 14-20 d of differentiation, bone marrow mesenchymal stem cells formed clones, in 10%-50% of which spontaneous beating cell-mass had come to continuously exist. Isoproterenol increased the beating rate and calcium-deprived media inhibited the beating. The cells were identified to be cardiomyocytes by expression of cardiac myosin heavy chain. CONCLUSION: HGF may induce bone marrow mesenchymal stem cells into cardiomyocytes with high efficiency, but the differentiating pathway of stem cells remains to be further studied. [