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KMID : 1377020120090060311
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Tissue Engineering and Regenerative Medicine
2012 Volume.9 No. 6 p.311 ~ p.319
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Direct comparison of distinct cardiomyogenic induction methodologies in human cardiac-derived c-kit positive progenitor cells
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Choi Sung-Hyun
Jung Seok-Yun
Takayuki Asahara
Suh Won-Hee
Kwon Sang-Mo
Baek Sang-Hong
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Abstract
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Cardiac stem/progenitor cells can be differentiated into cardiomyocytes in vitro using several differentiation methodologies. However, the methodology of cardiomyogenic induction in human c-kit positive progenitor cells (hCPCsc-kit+) was not fully demonstrated. Thus, the purpose of our study was to directly evaluate each cardiomyocyte induction system using hCPCsc-kit+. In this study, cardiomyocyte induction methodologies were divided into the following three groups; treatment with dexamethasone, 5-azacytidine, and co-treatment with 5-azacytidine and Transforming Growth Factor Beta 1 (TGF-β1), using different serum concentrations [2% or 10% fetal bovine serum (FBS)]. GATA4 and Nkx2-5, cardiac-specific transcription factors, were expressed in our hCPCsckit+. However, the GATA4 and Nkx2-5 expressions were significantly decreased in 10% FBS/cardiomyogenic induction system (p < 0.01), whereas the GATA4 and Nkx2-5 expressions were preserved in 2% FBS/cardiomyogenic induction system (p > 0.05). GATA4 and Nkx2-5 is crucial roles in cardiac development, thus we considered the low serum conditions more affected in our cardiomyogenic induction system. In addition, c-kit expression decreased significantly during cardiomyogenic differentiation. Importantly, we demonstrated that co-treated with 5-azacytidine and TGF-β1 led to an earlier expression pattern of alpha-sarcomeric actin (α-SA), implying that this cardiomyocyte induction system facilitates early cardiomyocyte differentiation of hCPCsc-kit+. Thus, the present study provides a pivotal cardiomyogenic differentiation methodology using hCPCsc-kit+for basic or clinical research.
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KEYWORD
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5-azacytidine, cardiomyocyte differentiation, dexamethasone, hCPCsc-kit+, TGF-β1
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