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Retinoids activate superoxide production by polymorphonuclear leucocytes.

H Hemilä, M Wikström

    Scandinavian Journal of Immunology
    |March 1, 1985
    PubMed
    Summary
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    Retinol and retinoic acid activate human polymorphonuclear leucocytes (PMN) to consume oxygen by producing superoxide. This contrasts with previous findings, suggesting a dual role for retinoids in immune cell function.

    Area of Science:

    • Immunology
    • Cell Biology
    • Biochemistry

    Background:

    • Retinoids, vitamin A derivatives, have complex roles in cellular processes.
    • Previous studies suggested retinoids inhibit PMN activation, potentially protecting against cancer.
    • The precise mechanisms and concentration-dependent effects of retinoids on PMN remain incompletely understood.

    Purpose of the Study:

    • To investigate the direct effects of specific retinoids on human polymorphonuclear leucocytes (PMN) oxygen consumption.
    • To elucidate the role of superoxide production in retinoid-mediated PMN activation.
    • To compare the activation and inhibition effects of retinoids on PMN at different concentrations.

    Main Methods:

    • Measurement of oxygen consumption in human PMN treated with retinol, retinoic acid, and retinyl acetate.

    Related Experiment Videos

  • Quantification of superoxide production via superoxide dismutase-inhibitable cytochrome c reduction.
  • Assessment of PMN activation by phorbol myristate acetate (PMA) and formyl-Met-Leu-Phe (fMLP) in the presence of varying retinoid concentrations.

    • Main Results:

    • Retinol and retinoic acid effectively activated PMN oxygen consumption and superoxide production in a concentration-dependent manner.
    • Retinyl acetate did not activate PMN.
    • Retinoic acid showed dose-dependent effects, inhibiting fMLP-induced activation at concentrations that did not activate PMN independently, while only slightly inhibiting PMA-induced activation at higher, activating concentrations.

    Conclusions:

    • Retinol and retinoic acid are direct activators of human PMN, primarily through superoxide production.
    • The previously reported inhibitory effects of retinoids on PMN activation may be concentration-dependent and context-specific.
    • Retinoids exhibit differential modulation of PMN activation pathways, with potential implications for immune responses and retinoid therapy.