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Hyperoxia and angiogenesis.

Harriet W Hopf1, Jeffrey J Gibson, Adam P Angeles

  • 1Wound Healing Research Laboratory, Department of Anesthesia and Perioperative Care, University of California, San Francisco, California 94143, USA. hopfh@anesthesia.ucsf.edu

Wound Repair and Regeneration : Official Publication of the Wound Healing Society [And] the European Tissue Repair Society
|November 15, 2005
PubMed
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Oxygen levels significantly impact blood vessel formation (angiogenesis). Hyperoxia (high oxygen) enhances it, while hypoxia (low oxygen) inhibits it, crucial for wound healing and ischemic tissues.

Area of Science:

  • Physiology
  • Wound Healing
  • Biomedical Engineering

Background:

  • Neovascularization is critical for tissue repair and is influenced by oxygen availability.
  • Understanding the precise relationship between oxygen tension and angiogenesis is vital for therapeutic interventions.

Purpose of the Study:

  • To investigate the effect of varying oxygen concentrations (hypoxia, normoxia, hyperoxia) on neovascularization.
  • To determine if oxygen tension influences angiogenesis independently or in conjunction with vascular endothelial growth factor (VEGF).

Main Methods:

  • Matrigel plugs were implanted subcutaneously in mice and exposed to different oxygen environments (13% O2, 21% O2, or intermittent 100% O2 at various pressures).
  • Vascular endothelial growth factor (VEGF) and anti-VEGF antibody were used as additives in the Matrigel.

Related Experiment Videos

  • Neovascularization within the Matrigel was quantified microscopically after 7 days.

    • Main Results:

    • Angiogenesis was significantly increased in all hyperoxic groups compared to controls.
    • Hypoxia significantly inhibited angiogenesis.
    • Anti-VEGF antibody neutralized the pro-angiogenic effects of both VEGF and hyperoxia.

    Conclusions:

    • Angiogenesis is directly proportional to ambient oxygen partial pressure (pO2) across a broad range.
    • Oxygen is essential for angiogenesis, and intermittent oxygen exposure can support neovascularization in ischemic tissues.
    • This study validates the clinical observation that adequate oxygen supply is necessary for effective wound healing.