Role of the intracellular localization of HIF-prolyl hydroxylases

Ken ichi Yasumoto, Yusuke Kowata, Atsushi Yoshida, Satoru Torii, Kazuhiro Sogawa

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20 Citations (Scopus)


Hypoxia-inducible factor-1 (HIF-1) is a major transcription factor regulating the response of tumor cells to hypoxia and is comprised of HIF-1α and Arnt (HIF-1β). In mammalian cells, HIF-1 protein levels are regulated by three HIF-prolyl hydroxylases, termed PHD1, PHD2 and PHD3. To assess whether intracellular localization of PHD1 and PHD2 affects the hypoxic response via HIF-1, we investigated the localization signal of PHDs. PHD1 possessed at least one nuclear localization signal (NLS), and PHD2 contained a region as essential for nuclear export in their N-terminal region. Treatment of cells with leptomycin B revealed that PHD2 was able to shuttle between the cytoplasm and the nucleus. Reporter assay indicated that differences in the intracellular distribution of PHD1 did not influence on HIF-1α activity. However, a PHD2 mutant lacking the region for nuclear export exhibited significantly reduced effect to HIF-1α activity compared to wild-type PHD2, suggesting that the regulation of the intracellular distribution of PHD2 is an effective pathway for the control of the hypoxic response.

Original languageEnglish
Pages (from-to)792-797
Number of pages6
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Issue number5
Publication statusPublished - 2009 May


  • HIF-1
  • Hypoxia
  • Prolyl hydroxylase

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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