Sp5 induces the expression of Nanog to maintain mouse embryonic stem cell self-renewal.

Sp5 induces the expression of Nanog to maintain mouse embryonic stem cell self-renewal.
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Sp5诱导Nanog表达维持小鼠胚胎干细胞自我更新

DOI:
10.1371/journal.pone.0185714
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Ye S
Ye S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tang L;Wang M;Liu D;Gong M;Ying QL;Ye S

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白血病抑制因子(LIF)激活信号换能器和转录激活因子3 (STAT3)维持小鼠胚胎干细胞(mESC)的自我更新。我们之前的研究表明,反式转录因子5 (Sp5)是LIF/STAT3的下游靶点,支持mESC自我更新。然而,Sp5发挥这些作用的机制仍然难以捉摸。本研究发现Nanog是Sp5的直接靶点,在mESCs中介导Sp5的自我更新促进作用。过表达Sp5可诱导Nanog的表达,而敲低或敲除Sp5可降低Nanog的表达。此外,染色质免疫沉淀(ChIP)实验显示Sp5直接结合到Nanog启动子上。功能研究表明,Nanog基因的敲除消除了Sp5基因促进mESC自我更新的能力。最后,我们证明了Sp5的自我更新促进功能在很大程度上依赖于它的锌指结构域。综上所述,我们的研究提供了Sp5在mESC中未被认识的功能,并将扩展我们目前对mESC多能性调控的理解。
Activation of signal transducer and activator of transcription 3 (STAT3) by leukemia inhibitory factor (LIF) maintains mouse embryonic stem cell (mESC) self-renewal. Our previous study showed that trans-acting transcription factor 5 (Sp5), an LIF/STAT3 downstream target, supports mESC self-renewal. However, the mechanism by which Sp5 exerts these effects remains elusive. Here, we found that Nanog is a direct target of Sp5 and mediates the self-renewal-promoting effect of Sp5 in mESCs. Overexpression of Sp5 induced Nanog expression, while knockdown or knockout of Sp5 decreased the Nanog level. Moreover, chromatin immunoprecipitation (ChIP) assays showed that Sp5 directly bound to the Nanog promoter. Functional studies revealed that knockdown of Nanog eliminated the mESC self-renewal-promoting ability of Sp5. Finally, we demonstrated that the self-renewal-promoting function of Sp5 was largely dependent on its zinc finger domains. Taken together, our study provides unrecognized functions of Sp5 in mESCs and will expand our current understanding of the regulation of mESC pluripotency.
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