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• W2013596938 abstract "RUNX3 is silenced by histone modification and hypoxia-inducible factor (HIF)-1α is stabilized under hypoxia, but little is known of cross-talk between RUNX3 and HIF-1α under hypoxia. In the present study, the authors investigated the effect of RUNX3 on HIF-1α stability in gastric cancer cells. RUNX3 overexpression was found to downregulate HIF-1α stability under normoxic and hypoxic conditions. Furthermore, the activity of a luciferase reporter containing five copies of vascular endothelial growth factor (VEGF) promoter hypoxia-responsive element (5 × HRE) and the amount of secreted VEGF, were diminished in RUNX3-expressing but increased in RUNX3-knockdown cells. When expression of RUNX3 was recovered using epigenetic reagents the expressions of HIF-1α and VEGF were clearly suppressed under hypoxic conditions. RUNX3 also significantly attenuated the half-life of HIF-1α protein, and induced the cytosolic localization and ubiquitination of HIF-1α. In addition, RUNX3 directly interacted with the C-terminal activation domain of HIF-1α and prolyl hydroxylase (PHD) 2 and enhanced the interaction between HIF-1α and PHD2, which potentiated proline hydroxylation and promoted the degradation of HIF-1α. Furthermore, RUNX3 overexpression significantly inhibited hypoxia-induced angiogenesis in vitro and in vivo. Taken together, these results suggest that RUNX3 destabilizes HIF-1α protein by promoting the proline hydroxylation of HIF-1α through binding to HIF-1α/PHD2. RUNX3 appears to be a novel suppressor of HIF-1α and of hypoxia-mediated angiogenesis in gastric cancer cells." @default.
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• W2013596938 date "2013-04-01" @default.
• W2013596938 modified "2023-10-09" @default.
• W2013596938 title "RUNX3 inhibits hypoxia-inducible factor-1α protein stability by interacting with prolyl hydroxylases in gastric cancer cells" @default.
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• W2013596938 doi "https://doi.org/10.1038/onc.2013.76" @default.
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