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Distinct Cell-Cycle Control in Two Different States of Mouse Pluripotency.
Cell Stem Cell ( IF 19.8 ) Pub Date : 2017-10-05 , DOI: 10.1016/j.stem.2017.09.004
Menno Ter Huurne 1 , James Chappell 2 , Stephen Dalton 2 , Hendrik G Stunnenberg 1
Affiliation  

Mouse embryonic stem cells (ESCs) cultured in serum are characterized by hyper-phosphorylated RB protein, lack of G1 control, and rapid progression through the cell cycle. Here, we show that ESCs grown in the presence of two small-molecule inhibitors (2i ESCs) have a longer G1-phase with hypo-phosphorylated RB, implying that they have a functional G1 checkpoint. Deletion of RB, P107, and P130 in 2i ESCs results in a G1-phase similar to that of serum ESCs. Inhibition of the ERK signaling pathway in serum ESCs results in the appearance of hypo-phosphorylated RB and the reinstatement of a G1 checkpoint. In addition, induction of a dormant state by the inhibition of MYC, resembling diapause, requires the presence of the RB family proteins. Collectively, our data show that RB-dependent G1 restriction point signaling is active in mouse ESCs grown in 2i but abrogated in serum by ERK-dependent phosphorylation.

中文翻译:

小鼠多能性的两种不同状态下的独特细胞周期控制。

血清中培养的小鼠胚胎干细胞 (ESC) 的特点是 RB 蛋白过度磷酸化、缺乏 G1 控制以及细胞周期快速进展。在这里,我们证明在两种小分子抑制剂(2i ESC)存在下生长的 ESC 具有更长的 G1 期和低磷酸化的 RB,这意味着它们具有功能性的 G1 检查点。2i ESC 中 RB、P107 和 P130 的缺失会导致与血清 ESC 相似的 G1 期。抑制血清 ESC 中的 ERK 信号通路会导致低磷酸化 RB 的出现和 G1 检查点的恢复。此外,通过抑制 MYC 诱导休眠状态(类似于滞育)需要 RB 家族蛋白的存在。总的来说,我们的数据表明,RB 依赖性 G1 限制点信号在 2i 中生长的小鼠 ESC 中活跃,但在血清中被 ERK 依赖性磷酸化消除。
更新日期:2017-10-05
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