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Halothane inhibits the microbicidal oxidative activity of pulmonary alveolar macrophages

W D Welch

    Anesthesiology
    |May 1, 1983
    PubMed

    Insights

    Clinical halothane concentrations impair pulmonary alveolar macrophage (PAM) oxidative activity, reducing key microbicidal intermediates. This inhibition is reversible upon halothane removal, suggesting potential for recovery.

    Area of Science:

    • Immunology
    • Anesthesiology
    • Cell Biology

    Background:

    • Pulmonary alveolar macrophages (PAMs) are crucial for lung immunity.
    • Halothane is an anesthetic agent with potential cellular effects.
    • Oxidative activity of PAMs is vital for microbicidal function.

    Purpose of the Study:

    • To investigate the impact of clinical halothane concentrations on PAM oxidative activity.
    • To assess the generation of hydrogen peroxide (H2O2), hydroxyl radicals (OH), and superoxide anions (O2-) by PAMs.
    • To determine the reversibility of halothane's effects on PAM function.

    Main Methods:

    • Pulmonary alveolar macrophages (PAMs) were exposed to varying concentrations of halothane.
    • Chemiluminescence (CL) assays using luminol and lucigenin probes were employed.
    • Luminol CL measured overall oxidative activity (H2O2, OH, O2-), while lucigenin CL specifically measured O2- generation.

    Main Results:

    • Halothane exposure significantly inhibited both luminol and lucigenin CL responses in PAMs (P < 0.01).
    • Inhibition ranged from 23-46% for luminol and 30-51% for lucigenin.
    • PAMs showed significant recovery of luminol CL responses after halothane removal, indicating reversibility.

    Conclusions:

    • Clinical halothane concentrations decrease the generation of superoxide anions and other oxidative metabolites by PAMs.
    • The observed inhibition of PAM microbicidal oxidative activity by halothane is reversible.
    • These findings have implications for understanding the immunomodulatory effects of halothane anesthesia.

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