NANOG is a direct target of TGFbeta/activin-mediated SMAD signaling in human ESCs.
NANOG is a direct target of TGFbeta/activin-mediated SMAD signaling in human ESCs.
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DOI:
10.1016/j.stem.2008.07.001
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发表时间:
2008-08-07
期刊:
影响因子:
23.9
通讯作者:
Thomson JA
中科院分区:
文献类型:
--
作者:
Xu RH;Sampsell-Barron TL;Gu F;Root S;Peck RM;Pan G;Yu J;Antosiewicz-Bourget J;Tian S;Stewart R;Thomson JA
Self-renewal of human embryonic stem (ES) cells is promoted by FGF and TGFβ/Activin signaling, and differentiation is promoted by BMP signaling, but how these signals regulate genes critical to the maintenance of pluripotency has been unclear. Using a defined medium, we show here that both TGFβ and FGF signals synergize to inhibit BMP signaling, sustain expression of pluripotency-associated genes such as NANOG, OCT4, and SOX2, and promote long-term undifferentiated proliferation of human ES cells. We also show that both TGFβ- and BMP-responsive SMADs can bind with the NANOG proximal promoter. NANOG promoter activity is enhanced by TGFβ/Activin and FGF signaling, and is decreased by BMP signaling. Mutation of putative SMAD binding elements reduces NANOG promoter activity to basal levels, and makes NANOG unresponsive to BMP and TGFβ signaling. These results suggest that direct binding of TGFβ/Activin-responsive SMADs to the NANOG promoter plays an essential role in sustaining human ES cell self-renewal.
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