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Uncoupling of Oxidative and Non‐Oxidative Mechanisms in Human Granulocyte‐Mediated Cytotoxicity: Use of Cytoplasts and Cells From Chronic Granulomatous Disease Patient
Author(s) -
Kessel Kok P.M.,
Strijp Jos A.G.,
KatsRenaud Henny J.,
Miltenburg Lia A.M.,
Fluit Ad C.,
Verhoef Jan
Publication year - 1990
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1002/jlb.48.4.359
Subject(s) - chronic granulomatous disease , oxidative phosphorylation , biology , granulocyte , cytotoxicity , cytoplast , immunology , respiratory burst , oxidative metabolism , oxidative stress , microbiology and biotechnology , cytoplasm , biochemistry , metabolism , in vitro
Human polymorphonuclear leukocytes (PMN) and granule‐free cytoplasts were compared for their cytotoxic capacities against red blood cells (RBC) and K562 tumor cells. Phorbol myristate acetate (PMA) stimulated PMN to efficient lysis of RBC targets, while cytotoxicity against the tumor cell line K562 was moderate. Activated cytoplasts also lysed RBC targets but were not able to kill K562 tumor cells, even at high cell numbers. Suppression of the glutathione redox cycle of the K562 tumor targets markedly increased their susceptibility to lysis by PMA‐activated PMN. Despite the enhanced susceptibility of antioxidant‐depleted K562 tumor cells to oxygen radical‐induced damage, PMA‐stimulated cytoplasts did not kill these targets. Addition of exogenous myeloperoxidase or lactoferrin to cytoplasts devoid of granule did not improve the lysis of RBC and K562 tumor cells. Coating K562 targets with specific antibodies induced efficient PMN‐mediated killing in comparison to PMA‐stimulated lysis of non‐coated targets. Cytoplasts, however, did not kill antibody‐coated K562 tumor cells; this was not improved by glutathione depletion but showed some lysis of antibody‐coated RBC. PMN from a patient with chronic granulomatous disease (CGD) showed normal antibody‐dependent cell‐mediated cytotoxicity (ADCC) against K562 tumor cells but were not able to lyse these targets after PMA stimulation. The analysis of target cell killing by cytoplasts and PMN from a CGD patient indicated that granular constituents are important mediators in the killing of nucleated target cells and that PMN‐mediated ADCC does not require the release of reactive oxygen species. Differences in the susceptibility of target cells to oxygen‐mediated lysis indicates that target cell antioxidant mechanisms play an important role in the outcome of the cytotoxic response.