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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2008.1
- 수록면
- 55 - 74 (20page)
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Previously, we have shown that hypoxia, through HIF-1, induces ligand-independent $ER{\alpha}$ activation and the physical interaction of HIF-1 and $ER{\alpha}$. However, the effect of hypoxia on the transactivation of $ER{\beta}$ is not yet known. In the present study, we found that hypoxia activated the $ER{\beta}$-mediated transcriptional response in the HEK 293 cell line, as determined by the transient expression of$ER{\beta}$ and ER-responsive reporter plasmids. The hypoxia-induced estrogen response element-mediated transcriptional response was dependent on $ER{\beta}$ expression and was inhibited by the ER antagonist ICI 182,780. Transactivation of $ER{\beta}$ was induced by the expression of HIF-$1{\alpha}$ under normoxic conditions, as determined by the expression of oxygen-independent stable GFP-HIF-$1{\alpha}$. HIF-$1{\alpha}$-induced $ER{\beta}$ transactivation was abolished by the inhibition of HIF-$1{\alpha}$ activation. This was determined by using chemical inhibitors for the MAPK pathway. In addition, HIF-$1{\alpha}$ interacted with $ER{\beta}$ in a mammalian-two hybrid assay. We conclude that hypoxia activates $ER{\beta}$ in a ligand-independent manner, possibly through the interaction of HIF-$1{\alpha}$ and $ER{\beta}$.
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