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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Maintenance of murine embryonic stem cells' self-renewal and pluripotency with increase in proliferation rate by a bovine granulosa cell line-conditioned medium.
Stem Cells and Development 2011 August
Murine embryonic stem cells (mESCs) are pluripotent cells that can be propagated in an undifferentiated state in continuous culture on a feeder layer or without feeders in the presence of leukemia inhibitory factor (LIF). Although there has been a great advance since their establishment, ESC culture is still complex and expensive. Therefore, finding culture conditions that maintain the self-renewal of ESCs, preventing their differentiation and promoting their proliferation, is still an area of great interest. In this work, we studied the effects of the conditioned medium from a bovine granulosa cell line (BGC-CM) on the maintenance of self-renewal and pluripotency of mESCs. We found that this medium is able to maintain mESCs' self-renewal while preserving its critical properties without LIF addition. mESCs cultured in BGC-CM expressed the stem cell markers Oct4, Sox2, Nanog, SSEA-1, Klf4, Rex1, and ECAT1. Moreover, mESCs cultured in BGC-CM gave rise to embryoid bodies and teratomas that differentiated effectively to diverse cell populations from endoderm, mesoderm, and ectoderm. Further, we found that mESCs cultured in BGC-CM have an increased proliferation rate compared with cells grown in the mESC standard culture medium supplemented with LIF. These findings may provide a powerful tool to culture mESCs for long periods of time with high proliferation rate while preserving its basic characteristics, contributing to the application of these cells to assess potential tissue engineering and cellular therapy applications.
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