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Related Experiment Videos

Selenium effects on human neutrophilic granulocyte function in vitro.

T Urban, C Jarstrand

    Immunopharmacology
    |October 1, 1986
    PubMed
    Summary

    Selenium supplementation can boost the phagocytic and bactericidal functions of human neutrophils, enhancing the body's defense against bacterial infections. This effect was observed at physiological selenium concentrations.

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    Area of Science:

    • Immunology
    • Nutritional Science
    • Cell Biology

    Background:

    • Neutrophilic granulocytes are crucial for host defense against bacterial infections.
    • Glutathione peroxidase activity in neutrophils can be influenced by selenium levels.
    • Understanding the impact of selenium on neutrophil function is important for immune health.

    Purpose of the Study:

    • To investigate the effects of sodium selenite on the phagocytic functions of human neutrophilic granulocytes.
    • To determine the dose-dependent effects of selenium on neutrophil activity.
    • To assess the potential of selenium supplementation to enhance immune response.

    Main Methods:

    • Human neutrophilic granulocytes from donors with low glutathione peroxidase activity were exposed to sodium selenite in vitro.
    • Assessed functions included spontaneous and chemotactic migration, nitroblue tetrazolium reduction, phagocytosis of yeast particles, and intracellular killing of staphylococci.
    • Compared selenium-exposed granulocytes to control cells.

    Main Results:

    • Selenium exposure did not affect granulocyte migration or nitroblue tetrazolium reduction.
    • Phagocytic and bactericidal activities were significantly increased at physiological selenium concentrations (100 and 200 ng Se/ml).
    • At a high concentration (2000 ng Se/ml), these activities were reduced compared to controls.

    Conclusions:

    • Selenium supplementation at physiological concentrations can enhance the phagocytic and bactericidal functions of human granulocytes.
    • This enhancement may improve host defense against bacterial infections.
    • Excessive selenium concentrations may impair these immune functions.

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