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Free oxygen radicals decrease electrical resistance of microvascular endothelium in brain.

S P Olesen

    Acta Physiologica Scandinavica
    |February 1, 1987
    PubMed
    Summary
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    Free oxygen radicals rapidly decrease brain venular endothelium electrical resistance, indicating potential for vascular damage. This effect is reversible at lower concentrations and blocked by antioxidants.

    Area of Science:

    • Neuroscience
    • Vascular Biology
    • Biochemistry

    Background:

    • Brain venular endothelium's electrical resistance reflects ionic permeability.
    • Free oxygen radicals are implicated in cellular damage.

    Purpose of the Study:

    • To investigate the rapid effects of free oxygen radicals on brain venular endothelium electrical resistance.
    • To explore the mechanisms and reversibility of this effect.

    Main Methods:

    • Continuous recording of electrical resistance in anesthetized frog brain venules.
    • Generation of oxygen radicals via xanthine oxidase and hypoxanthine enzymatic reaction.
    • Administration of varying xanthine oxidase concentrations and blocking agents.

    Main Results:

    Related Experiment Videos

    • Oxygen radicals caused a rapid decrease in endothelial electrical resistance within 1-2 seconds.
    • The effect was dose-dependent and reversible at lower xanthine oxidase concentrations (25-50 mU/ml).
    • Allopurinol, superoxide dismutase, and catalase completely blocked the response.

    Conclusions:

    • Free oxygen radicals significantly alter brain vascular electrical resistance.
    • These radicals may play a key role in mediating vascular endothelial damage in the brain.