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[The relationship between adhesion molecules and hypoxia].

E Ohga, T Matsuse

    Nihon Rinsho. Japanese Journal of Clinical Medicine
    |August 17, 2000
    PubMed
    Summary
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    Hypoxia, a low-oxygen state, can directly activate the ICAM-1 gene by activating NF-kappa B (NFk-B). This pathway may contribute to cardiovascular disorders, particularly in conditions like Obstructive Sleep Apnea Syndrome (OSAS).

    Area of Science:

    • Molecular Biology
    • Physiology
    • Pathophysiology

    Background:

    • Hypoxia is a critical stimulus in development and physiology, implicated in diseases like heart attack and cancer.
    • Recent research suggests hypoxia can directly activate nuclear factor kappa B (NFk-B).
    • NFk-B binding sites are present in the promoter region of the intercellular adhesion molecule 1 (ICAM-1) gene.

    Purpose of the Study:

    • To investigate the potential direct activation of ICAM-1 by hypoxia via NFk-B.
    • To explore the role of hypoxia-induced adhesion molecules in diseases, specifically cardiovascular disorders.

    Main Methods:

    • Review of existing studies on hypoxia, NFk-B, and ICAM-1 gene regulation.
    • Analysis of the link between hypoxia-inducible factor 1 (HIF-1) and adhesion molecule induction.

    Related Experiment Videos

  • Examination of clinical observations, such as elevated cICAM-1 levels in Obstructive Sleep Apnea Syndrome (OSAS) patients.

    • Main Results:

    • Hypoxia may directly activate ICAM-1 expression through the activation of NFk-B.
    • Adhesion molecules are induced by hypoxia, similar to inflammatory cytokines like IL-1 and TNF-alpha, especially during anoxia/reperfusion.
    • Increased levels of cICAM-1 were observed in patients with OSAS, suggesting a link to hypoxia.

    Conclusions:

    • Hypoxia-induced activation of adhesion molecules, such as ICAM-1, is a significant factor in various diseases.
    • OSAS-related hypoxia appears to activate adhesion molecules, contributing to cardiovascular disorder risk.
    • Understanding this pathway is crucial for managing hypoxia-related pathologies and cardiovascular complications.