[Differentiation of QY1 bone marrow pluripotential mesenchymal stem cell line cells into cardiomyocytes and vascular endothelial cells in vitro].

OBJECTIVE: To explore the differentiation potential of QY1 bone marrow mesenchymal stem cell (MSCs) line cells into cardiacmyocytes and vascular endothelial cells in vitro, to optimize the suitable conditions of MSCs differentiating into cardiomyocytes in vitro, and to examine the potentials of MSCs differentiating into cardiomyogenesis and vasculogenesis.

METHODS: Specifically committed differentiation inductive medium was employed, including 5-azacytidine for cardiomyogenesis and vascular endothelial growth factor for vasculogenesis in culture respectively in vitro. The differentiated cells were identified by immunohistochemistry and molecular biology.

RESULTS: MSCs line cells had been cultured in the normal culture medium for 72 hours, then the differentiation inductive medium including 10 micromol/L 5-azacytidine was added into the normal culture dishes for 24 hours only. After that the culture medium was changed back to the normal culture medium. Normal culture medium was changed every 7 days. The second induction was performed after 14 days. The differentiated cells treated with 5-azacytidine could beat spontaneously and formed myotube structures in the optimal induction conditions, and the differentiation rate was (39.47+/-0.56)%. The differentiated cells expressed specific cardiomyocytic proteins identified by the positive immunohistochemistry staining with anti-alpha-sarcomeric antibody and anti-Cx-43 antibody, and also expressed the alpha-myosin heavy chain examined by RT-PCR. The differentiated cells began to appear as the lined up vascular endothelial cells after 48 hour treatment with vascular endothelial growth factor. Some of the differentiated cells connected each other to form vascular endothelial web-like structure after 7 day treatment with vascular endothelial growth factor. On 14 d after treating with vascular endothelial growth factor, the differentiated cells were identified by immunohistochemistry staining. The expressions of both specific surface antibody CD31 and factor VIII for vascular endothelial cells were positive.

CONCLUSION: The cells of QY1 bone marrow mesenchymal stem cell line may differentiate into cardiomyocytes or vascular endothelial cells in vitro under specific condition.