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The synergistic tumoricidal activity of anticancer drugs and oxidative burst-triggered macrophages

S Marcovitch, Y Keisari

    Cancer Immunology, Immunotherapy : CII
    |January 1, 1985
    PubMed

    Insights

    Anticancer drugs adriamycin and actinomycin D impair macrophage oxidative burst. However, these drugs can enhance macrophage tumor cell killing, suggesting a cooperative anti-cancer effect in vitro.

    Area of Science:

    • Immunology
    • Pharmacology
    • Oncology

    Background:

    • The oxidative burst (OB) is a key mechanism by which macrophages kill tumor cells.
    • Anticancer drugs can modulate immune cell functions, potentially impacting anti-tumor immunity.

    Purpose of the Study:

    • To investigate the effects of adriamycin (ADR) and actinomycin D (AMD) on the oxidative burst of mouse peritoneal macrophages (MPM).
    • To determine if these anticancer drugs enhance the ability of OB-stimulated MPM to kill tumor cells.

    Main Methods:

    • MPM were treated with ADR and AMD at various concentrations and time points.
    • Hydrogen peroxide (H2O2) production was measured to assess the oxidative burst.
    • Tumor cells (EL4 and TLX-9) were pretreated with ADR and then exposed to OB-stimulated MPM to evaluate cytotoxicity.

    Main Results:

    • ADR and AMD significantly impaired MPM oxidative burst, particularly after 24-hour treatment.
    • The toxicity of ADR and AMD to MPM was comparable to their toxicity to tumor cells.
    • Pretreatment of tumor cells with sublethal ADR concentrations sensitized them to killing by OB-stimulated MPM.

    Conclusions:

    • Anticancer drugs ADR and AMD can inhibit macrophage oxidative burst.
    • Despite inhibiting OB, ADR can enhance the susceptibility of tumor cells to macrophage-mediated killing.
    • Anticancer drugs and OB-stimulated macrophages may cooperate to destroy tumor cells in vitro.

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