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Embryonic stem (ES) cells are pluripotent and can be differentiated into any cell type of the three embryonic germ layers. Cardiomyocytes derived from ES cells can be served as a cell source for transplantation medicine. There, however, are many huddles in ES cell research. One of them is relatively low differentiation rate into a specific lineage cells, resulting into a limitation in getting the highly enriched cell population. To overcome this limitation, here we report two mouse ES cell lines (designated KH1 and KH2) expressing enhanced green fluorescence protein (EGFP) under direction of an a-myosin heavy chain (?-MHC) gene promoter that specifically works in cardiomyocytes. The ES cells could form teratomas NOD-scid mice within two weeks, indicating its pluripotency. These ES cells do not express EGFP until differentiated into cardiomyocytes. EGFP expressing cells were appeared as early as five days of differentiation and showed a characteristic of cardiomyocytes as demonstrated by expressions of marker genes and by its spontaneous contracting activity. The EGFP expressions were specifically detected in the all beating areas. The ratio of EGFP expressing cells could be enhanced by dimethysulfoxide (DMSO), although the ratio in the spontaneously differentiating cells, even in the highest level, was <1.5%. The live cardiomyotyes derived from the ES cells could be highly enriched for further characterization by fluorescence activated cell sorter (FACS). These results indicate that our cell lines might be very useful for studies on in vitro cardiomyocyte differentiation as well as on in vivo transplantation experiments.

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Introduction
Materials and Methods
Results
Discussion
Acknowledgment
References

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UCI(KEPA) : I410-ECN-0101-2009-510-016364776