Research summary
A sequence of biochemical and molecular-genetic studies establishes Hypoxia-Inducible Factor 1 (HIF-1) as the principal transcriptional regulator of mammalian oxygen homeostasis. Initial work identified a 50-nucleotide hypoxia-responsive enhancer in the 3' flanking region of the human erythropoietin gene that conferred ~7-fold induction of a reporter under low oxygen, and showed by DNase I footprinting and mutagenesis that an inducible factor required de novo protein synthesis to bind a critical site [4]. The DNA-binding activity was subsequently purified ~11,250-fold from Hep3B and HeLa cells, revealing a heterodimer composed of HIF-1 alpha and HIF-1 beta subunits [6]. Cloning and characterisation showed both subunits are basic helix-loop-helix PAS proteins, with HIF-1 alpha most closely related to Drosophila Sim and HIF-1 beta corresponding to ARNT; both subunit RNA and protein levels were induced at 1 percent O2 and decayed rapidly upon reoxygenation [1]. Mechanistic work then linked HIF-1 to vascular endothelial growth factor (VEGF) transcription, mapping a 47-bp hypoxia-response element upstream of VEGF and demonstrating direct HIF-1 binding [2]. Loss-of-function studies in Hif1a-/- embryonic stem cells showed reduced expression of glucose-transporter and glycolytic-enzyme mRNAs, impaired proliferation, and markedly diminished hypoxic VEGF induction, indicating that HIF-1 alpha is required for both metabolic and angiogenic adaptation to low oxygen [3]. Immunohistochemical screening of 179 human tumour specimens detected HIF-1 alpha overexpression in 13 of 19 tumour types relative to matched normal tissue, including colon, breast, gastric, and lung cancers, linking the pathway to solid-tumour neovascularisation and metabolism [5]. A review consolidates these findings, summarising the exponential dependence of HIF-1 activity on O2 concentration, the catalogue of target genes (erythropoietin, glucose transporters, glycolytic enzymes, VEGF), and HIF-1's requirement for cardiac and vascular development [7].
Recent publications
- Targeting HIF-1 for cancer therapyDOI
- Hypoxia-inducible factor 1 is a basic-helix-loop-helix-PAS heterodimer regulated by cellular O2 tension.DOI
- Activation of Vascular Endothelial Growth Factor Gene Transcription by Hypoxia-Inducible Factor 1DOI
- HIF-1-mediated expression of pyruvate dehydrogenase kinase: A metabolic switch required for cellular adaptation to hypoxiaDOI
- Hypoxia-Inducible Factors in Physiology and MedicineDOI
- Cellular and developmental control of O2 homeostasis by hypoxia-inducible factor 1伪DOI
- A nuclear factor induced by hypoxia via de novo protein synthesis binds to the human erythropoietin gene enhancer at a site required for transcriptional activation.DOI
- Overexpression of hypoxia-inducible factor 1alpha in common human cancers and their metastases.
- Purification and Characterization of Hypoxia-inducible Factor 1DOI
- Regulation of Mammalian O2Homeostasis by Hypoxia-Inducible Factor 1DOI
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External profiles
- ORCID: https://orcid.org/0000-0002-0913-211X
- OpenAlex: openalex.org
Profile compiled from public sources (Researchmap, OpenAlex, Kyoto University faculty directory). Last refreshed 2026-05. Report incorrect information.