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Environmental chemical-induced macrophage dysfunction

L D Loose, J B Silkworth, T Charbonneau

    Environmental Health Perspectives
    |June 1, 1981
    PubMed
    Summary
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    Environmental chemicals can suppress immune function. This study found that xenobiotics impair macrophage function in mice, affecting antigen clearance and tumor cell killing, highlighting macrophages as a key target for toxicity.

    Area of Science:

    • Immunotoxicology
    • Environmental Health
    • Cellular Immunology

    Background:

    • Growing concern over immunomodulation by environmental chemical contaminants.
    • Limited understanding of specific cellular targets responsible for xenobiotic-induced immunosuppression.
    • Previous studies suggest macrophages are implicated in xenobiotic-induced immune dysfunction.

    Purpose of the Study:

    • To investigate the specific effects of xenobiotics (PCB, HCB, dieldrin) on macrophage function.
    • To evaluate alterations in both in vitro and in vivo macrophage activities.
    • To determine the role of macrophage dysfunction in xenobiotic-induced immunosuppression.

    Main Methods:

    • Exposure of mice to polychlorinated biphenyl (PCB), hexachlorobenzene (HCB), and dieldrin.

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  • Isolation and assessment of macrophage functions (in vitro O2 consumption, phagocytosis, microbicidal activity).
  • Evaluation of in vivo antigen clearance, serum fibronectin levels, and tumoricidal activity against challenge tumor cells.

    • Main Results:

    • No alterations in in vitro macrophage functions (O2 consumption, phagocytosis, microbicidal activity).
    • Significant impairment in in vivo antigen clearance and altered antigen distribution, linked to decreased serum fibronectin.
    • Reduced resistance to tumor challenge, with impaired tumoricidal activity in HCB-treated mice and antigen processing defects in dieldrin-exposed macrophages.

    Conclusions:

    • Macrophage dysfunction is a key component of xenobiotic-induced immunosuppression.
    • Xenobiotics primarily affect the effector functions of macrophages, rather than their ability to recognize or internalize targets.
    • Splenic and alveolar macrophages are particularly sensitive to dieldrin toxicity, impacting cellular immune responses.