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Related Experiment Videos

Effect of sodium benzoate on polymorphonuclear leukocyte function.

K S Johansen, E M Berger

    Acta Pathologica, Microbiologica, Et Immunologica Scandinavica. Section C, Immunology
    |December 1, 1983
    PubMed
    Summary

    Sodium benzoate, a common food preservative, impairs polymorphonuclear leukocyte (PMN) function. This preservative reduces the ability of PMNs to kill bacteria, impacting immune response.

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    Area of Science:

    • Immunology
    • Food Science
    • Toxicology

    Background:

    • Sodium benzoate is a widely used food preservative.
    • It is known to scavenge hydroxyl radicals.
    • Its effects on immune cell function are not fully understood.

    Purpose of the Study:

    • To investigate the in vitro effects of sodium benzoate on polymorphonuclear leukocyte (PMN) function.
    • To determine if sodium benzoate impacts PMN responses to bacterial stimulation (Staphylococcus aureus) or chemical stimulation (phorbol myristate acetate).

    Main Methods:

    • Assays used included chemiluminescence (CL), total bactericidal activity, intracellular bacterial recovery, and release of lactate dehydrogenase (LDH), lysozyme, and superoxide anion (O2(-)).
    • PMNs were stimulated with S. aureus or PMA in the presence of varying concentrations of sodium benzoate.
    • Cellular damage was assessed by LDH release.

    Main Results:

    • Sodium benzoate decreased PMN chemiluminescence, superoxide anion, and lysozyme release when stimulated by S. aureus, but not by PMA.
    • PMN bactericidal activity against S. aureus was impaired by sodium benzoate.
    • Reduced intracellular bacterial recovery suggests decreased bacterial uptake by PMNs.
    • No significant PMN damage was observed at concentrations below 100 mM.

    Conclusions:

    • Sodium benzoate alters PMN function, specifically impairing their response to bacterial stimuli.
    • The mechanism appears to involve reduced uptake of S. aureus by PMNs.
    • These findings suggest potential immunomodulatory effects of sodium benzoate in the context of host defense.

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