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Related Experiment Videos

Macrophages as cytotoxic effector cells

M L Lohmann-Matthes, H Lang, D Sun

    Immunobiology
    |April 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Activated mononuclear phagocyte cells exhibit enhanced tumor and microbial cytotoxicity, potentially acting synergistically with antibody-dependent cell-mediated cytotoxicity (ADCC). Macrophage subpopulations may correlate with specific functions.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Mononuclear phagocyte system cells possess cytotoxic capabilities against tumor targets and microorganisms.
    • These cells can also mediate antibody-dependent cell-mediated cytotoxicity (ADCC).

    Purpose of the Study:

    • To investigate the synergistic action between lymphokine-activated cytotoxicity and ADCC.
    • To characterize the lymphokine MCF and its effect on macrophage cytotoxicity.
    • To explore the existence of distinct macrophage subpopulations and their functional correlations.

    Main Methods:

    • Activation of mononuclear phagocytes with lymphokines.
    • Assessment of extracellular and intracellular cytotoxicity.
    • Utilizing antibody-coated target cells for ADCC assays.
    • Partial purification and separation of lymphokine MCF.

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  • Intraperitoneal injection of purified MCF into mice.
  • Employing rat anti-mouse macrophage monoclonal antibodies to identify subpopulations.

    • Main Results:

    • Lymphokine-activated cytotoxicity and ADCC can act synergistically, with specificity determined by the antibody, not lymphokine dosage.
    • Partially purified lymphokine MCF activates macrophages to potent cytotoxicity.
    • Evidence suggests the existence of distinct macrophage subpopulations correlated with specific functions.

    Conclusions:

    • Synergistic cytotoxic mechanisms involving lymphokine activation and ADCC are antibody-specific.
    • Purified MCF is a potent activator of macrophage cytotoxicity.
    • Macrophage heterogeneity includes subpopulations with distinct functional roles.