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Related Experiment Videos

Ascorbate and phagocyte function.

L Stankova, N B Gerhardt, L Nagel

    Infection and Immunity
    |August 1, 1975
    PubMed
    Summary

    Ascorbate (vitamin C) does not significantly impact neutrophil hydrogen peroxide production or bacterial killing. However, it functions within neutrophils to protect cells from oxidants during phagocytosis.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Nutritional Science

    Background:

    • Neutrophils (PMN) are critical immune cells involved in combating bacterial infections.
    • Ascorbate (vitamin C) is an essential nutrient with known antioxidant properties.

    Purpose of the Study:

    • To investigate the role of ascorbate in neutrophil function, specifically hydrogen peroxide (H2O2) production and bacterial killing.
    • To explore the redox state of ascorbate within human neutrophils during phagocytosis.

    Main Methods:

    • Comparison of H2O2 production and Staphylococcus aureus killing by scorbutic and control guinea pig neutrophils.
    • Measurement of total, reduced, and dehydroascorbate levels in human neutrophils during phagocytosis.

    Main Results:

    • Scorbutic guinea pig neutrophils exhibited comparable H2O2 production and bacterial killing activity to control neutrophils.
    • Human neutrophils showed decreased levels of reduced ascorbate and increased dehydroascorbate upon phagocytosis.

    Conclusions:

    • Ascorbate does not appear to be a major contributor to phagocyte H2O2 production or bacterial killing.
    • Ascorbate likely functions as a redox-active component within neutrophils, protecting cellular components from oxidative damage during phagocytosis.

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