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The role of superoxide anion generation in antibody-dependent polymorphonuclear leukocyte-mediated cytotoxicity

F Capsoni, P L Meroni, A Lazzarin

    Bollettino Dell'Istituto Sieroterapico Milanese
    |September 30, 1979
    PubMed

    Insights

    Human polymorphonuclear leukocytes (PMNs) exhibit antibody-dependent cellular cytotoxicity (ADCC). Superoxide anion production, not hydrogen peroxide, is crucial for this PMN-mediated killing, as shown by experiments with chronic granulomatous disease (CGD) cells.

    Area of Science:

    • Immunology
    • Cellular Biology
    • Hematology

    Background:

    • Human polymorphonuclear leukocytes (PMNs) possess killer cell capabilities within antibody-dependent cellular cytotoxicity (ADCC) systems.
    • PMNs from patients with chronic granulomatous disease (CGD), characterized by defective oxidative metabolism, show an absolute deficit in ADCC.
    • This study investigates the specific role of toxic oxygen derivatives, namely hydrogen peroxide (H2O2) and superoxide anions (O-2), in PMN-mediated ADCC.

    Purpose of the Study:

    • To elucidate the contribution of superoxide anions and hydrogen peroxide to the cytotoxic function of PMNs in ADCC.
    • To determine whether the impaired ADCC in CGD is linked to the absence of specific oxygen metabolites.

    Main Methods:

    • Experiments were conducted using PMNs, including those from CGD patients.
    • Specific inhibitors were employed: superoxide dismutase (O-2 scavenger), catalase (H2O2 degrader), and sodium azide (myeloperoxidase inhibitor).
    • Cytotoxic activity was measured against chicken red blood cells in the presence of these inhibitors.

    Main Results:

    • Superoxide dismutase significantly inhibited PMN-mediated ADCC in a dose-dependent manner.
    • Catalase and sodium azide did not affect the cytotoxic activity of PMNs.
    • The results indicate that superoxide anion production is critical for PMN-mediated ADCC.

    Conclusions:

    • The intact oxidative metabolism, specifically the production of superoxide anions (O-2), is essential for effective PMN-mediated ADCC.
    • Hydrogen peroxide (H2O2) and myeloperoxidase activity are not critical components of this cytotoxic mechanism against chicken red blood cells.
    • The findings highlight the importance of superoxide anion generation in the killer cell function of PMNs.

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