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Hypoxia response elements

J F O'Rourke1, G U Dachs, J M Gleadle

  • 1Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK.

Oncology Research
|January 1, 1997
PubMed
Summary
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Hypoxia-inducible factor-1 (HIF-1) regulates gene expression in response to oxygen levels. Its activity is controlled by the stability of the HIF-1 alpha subunit, crucial for cellular adaptation to hypoxia.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Hypoxia-inducible factor-1 (HIF-1) is a transcription factor that regulates gene expression in response to oxygen levels.
  • HIF-1 is a heterodimer composed of HIF-1 alpha and HIF-1 beta subunits.
  • Oxygen concentration influences HIF-1 activity, primarily through post-translational modifications of the HIF-1 alpha subunit.

Purpose of the Study:

  • To elucidate the mechanism of oxygen-regulated HIF-1 activation.
  • To investigate the role of HIF-1 in cellular responses to hypoxia.
  • To identify regulatory domains within the HIF-1 alpha subunit.

Main Methods:

  • Molecular cloning of HIF-1.
  • Analysis of HIF-1 alpha subunit stability and regulatory domains.

Related Experiment Videos

  • Studies using cultured mutant mouse cells lacking HIF-1 beta.
  • In vivo studies using tumor xenografts derived from mutant and wild-type cells.

    • Main Results:

    • HIF-1 activity is mainly controlled by the abundance of the HIF-1 alpha subunit, regulated by protein stability.
    • Two distinct regulatory domains in the C-terminus of the HIF-1 alpha subunit were identified.
    • HIF-1 plays a critical role in the transcriptional activation of target genes involved in cellular growth and metabolism.
    • HIF-1 is activated in vivo and significantly impacts gene expression in response to tumor hypoxia.

    Conclusions:

    • HIF-1 is a key mediator of the cellular response to oxygen levels.
    • The proposed mechanism involves inducible domains and changes in HIF-1 alpha protein levels.
    • HIF-1 is essential for coordinating oxygen supply with cellular growth and energy metabolism, particularly in hypoxic conditions like tumors.