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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Enforced Bcl-2 expression overrides serum and feeder cell requirements for mouse embryonic stem cell self-renewal
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Enforced Bcl-2 expression overrides serum and feeder cell requirements for mouse embryonic stem cell self-renewal

机译:强制的Bcl-2表达超越了小鼠胚胎干细胞自我更新的血清和饲养细胞要求

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摘要

Leukemia inhibitory factor (LIF) is required, but not sufficient, for pluripotent mouse embryonic stem (ES) cell expansion in vitro in the absence of serum or a feeder cell layer, suggesting that additional signals are provided by serum or feeders that are necessary to support self-renewal. Here we show that transgenic ES cell lines expressing Bcl-2, an antiapoptotic protein, continue to self-renew in serum- and feeder-free conditions when supplemented with LIF; even in the absence of bone morphogenic proteins. Bcl-2-expressing clones sustain the characteristics of un-differentiated, pluripotent ES cells during long-term culture, and maintain their potential to differentiate into mature cell types. These results suggest that LIF and Bcl-2 overexpression are sufficient to expand these mouse pluripotent stem cells in vitro.
机译:在没有血清或饲养细胞层的情况下,白血病抑制因子(LIF)对于多能小鼠胚胎干(ES)细胞体外扩增是必需的,但不足,这表明血清或饲养细胞提供了额外的信号,这些信号对于支持自我更新。在这里,我们显示了表达Bcl-2(一种抗凋亡蛋白)的转基因ES细胞系在补充LIF的情况下在无血清和无饲养层的情况下会继续自我更新。即使没有骨形态发生蛋白表达Bcl-2的克隆在长期培养过程中保持了未分化多能ES细胞的特征,并保持了其分化为成熟细胞类型的潜力。这些结果表明,LIF和Bcl-2的过度表达足以在体外扩增这些小鼠多能干细胞。

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