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Antioxidant effects on cell-mediated immunity.

H C Meeker, M L Eskew, W Scheuchenzuber

    Journal of Leukocyte Biology
    |October 1, 1985
    PubMed
    Summary
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    Dietary deficiencies in selenium and vitamin E impact immune cell function. Selenium and vitamin E deficiency depressed natural killer cell-mediated cytotoxicity and T-lymphocyte-mediated cytotoxicity in mice.

    Area of Science:

    • Immunology
    • Nutritional Science
    • Cell Biology

    Background:

    • Cell-mediated cytotoxicity is crucial for immune surveillance.
    • Selenium and vitamin E are essential nutrients with known roles in immune function.
    • Understanding the impact of nutrient deficiencies on cytotoxic pathways is vital for public health.

    Purpose of the Study:

    • To investigate the effects of dietary selenium and/or vitamin E deficiency on mouse cell-mediated cytotoxicity.
    • To differentiate the impact on natural killer cell-mediated cytotoxicity (NKCC), antibody-dependent cell-mediated cytotoxicity (ADCC), and T-lymphocyte-mediated cytotoxicity (TCMC).

    Main Methods:

    • Mice were fed diets deficient in selenium and/or vitamin E for 7-8 weeks.
    • Cell-mediated cytotoxicity assays were performed to measure NKCC, ADCC, and TCMC.

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  • Comparative analysis of cytotoxic activity between control and deficient groups.

    • Main Results:

    • Natural killer cell-mediated cytotoxicity (NKCC) was significantly depressed after 8 weeks of deficiency in selenium and/or vitamin E.
    • Antibody-dependent cell-mediated cytotoxicity (ADCC) remained unaffected by 8 weeks of selenium and/or vitamin E deficiency.
    • T-lymphocyte-mediated cytotoxicity (TCMC) was depressed by combined selenium and vitamin E deficiency after 7 weeks.

    Conclusions:

    • Dietary selenium and vitamin E play distinct roles in maintaining specific arms of cell-mediated immunity.
    • Combined deficiency of selenium and vitamin E has a more pronounced negative effect on T-lymphocyte cytotoxicity.
    • These findings highlight the importance of adequate selenium and vitamin E intake for robust immune function, particularly T-cell mediated responses.