HIF-1alpha inhibits self-renewal of mouse embryonic stem cells in vitro via negative regulation of the LIF-Stat3 pathway

Authors:
Jeong CH, Lee HJ, Cha JH, Kim JH, Kim KR, Kim JH, Yoon DK, Kim KW
In:
Source: J Biol Chem
Publication Date: (2007)
Issue: 282(18): 13672-9
Research Area:
Stem Cells
Cells used in publication:
Embryonic stem cell (ES), mouse
Species: mouse
Tissue Origin: embryo
Platform:
Nucleofectorâ„¢ I/II/2b
Abstract
During mammalian embryogenesis, the early embryo grows in a relatively hypoxic environment due to a restricted supply of oxygen. The molecular mechanisms underlying modulation of self-renewal and differentiation of mouse embryonic stem cells (mESCs) under such hypoxic conditions remain to be established. Here, we show that hypoxia inhibits mESC self-renewal and induces early differentiation in vitro, even in the presence of leukemia inhibitory factor (LIF). These effects are mediated by down-regulation of the LIF-STAT3 signaling pathway. Under conditions of hypoxia, hypoxia-inducible factor-1alpha (HIF-1alpha) suppresses transcription of LIF-specific receptor (LIFR) by directly binding to the reverse hypoxia-responsive element located in the LIFR promoter. Ectopic expression and small interference RNA knockdown of HIF-1alpha verified the inhibitory effect on LIFR transcription. Our findings collectively suggest that hypoxia-induced in vitro differentiation of mESCs is triggered, at least in part, by the HIF-1alpha-mediated suppression of LIF-STAT3 signaling.