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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Nuclear localization of hypoxia-inducible factor-2alpha in bovine arterial endothelial cells.
Hypoxia-inducible factor (HIF)-2alpha is a recently identified hypoxia-inducible transcription factor abundantly expressed in vascular endothelial cells. As well as HIF-1alpha, HIF-2alpha forms a heterodimeric complex with the aryl hydrocarbon receptor nuclear translocator and upregulates hypoxia-inducible genes such as vascular endothelial growth factor. We found in this study that using green fluorescent protein (GFP) fusion constructs, the subcellular localization of HIF-2alpha was different from that of HIF-1alpha in bovine arterial endothelial cells (BAEC). HIF-1alpha was localized in the cytoplasm under normoxic cells and translocated from the cytoplasm into the nucleus in response to hypoxic induction. In contrast, HIF-2alpha was clearly localized in the nucleus of BAEC even under normoxic conditions. The regulation of HIF-2alpha might differ from that of HIF-1alpha in BAEC. We further showed that nuclear localization of HIF-2alpha was inhibited by either deletion or a single amino acid substitution within the C-terminal end of the protein. The amino acid sequence surrounding Lys737 and Arg738 functions as a nuclear localization signal of HIF-2alpha.
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