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Active oxygen in methylguanidine synthesis.

S Nagase, K Aoyagi, M Narita

    Nephron
    |January 1, 1986
    PubMed
    Summary
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    Methylguanidine (MG), a uremic toxin, is formed from creatinine oxidation. Active oxygen species, particularly hydroxyl radicals, significantly drive this process, suggesting MG as a marker for in vivo peroxidation.

    Area of Science:

    • Biochemistry
    • Toxicology
    • Uremic Toxin Research

    Background:

    • Methylguanidine (MG) is a known toxin found in uremia.
    • MG is hypothesized to be a product of creatinine oxidation.
    • Understanding MG synthesis is crucial for uremia research.

    Purpose of the Study:

    • To investigate the role of active oxygen in creatinine oxidation to MG.
    • To elucidate the mechanisms of MG synthesis under uremic conditions.
    • To assess MG's potential as an indicator of peroxidation.

    Main Methods:

    • In vitro study using hypoxanthine/xanthine oxidase to generate superoxide radicals.
    • Experimentation with hydrogen peroxide and FeSO4 to generate hydroxyl radicals.
    • Utilizing scavengers like sorbitol, lactulose, and ethanol to inhibit radical reactions.

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    Main Results:

    • Superoxide radicals moderately stimulated MG synthesis, inhibited by superoxide dismutase.
    • Hydrogen peroxide markedly increased MG synthesis.
    • Hydroxyl radicals augmented MG synthesis significantly (56,000x control), inhibited by radical scavengers.

    Conclusions:

    • Creatinine oxidation to MG is mediated by various active oxygen species.
    • Oxidative processes involving active oxygen are a key mechanism for MG synthesis.
    • Methylguanidine may serve as a valuable biomarker for in vivo peroxidation.