Abstract
Hydrogen peroxide release was examined using biochemical and cytochemical techniques in rat alveolar macrophages, at rest and during phagocytosis, and compared with rat blood neutrophils. Using biochemical techniques, alveolar macrophages released small amounts of hydrogen peroxide at rest, and no increase was observed after challenge with opsonized and nonopsonized zymosan particles at several particle-cell ratios (1:1 to 1:1,000). Neutrophils released similar quantities of hydrogen peroxide at rest but showed a 12-fold increase in hydrogen peroxide release following exposure to opsonized zymosan particles. Using cytochemical techniques to localize sites of hydrogen peroxide release, resting neutrophils showed little deposition of reaction product at the cell surface and occasional deposits in endocytotic vesicles. After exposure to latex particles, a dense reaction product was observed between the particle and the cell membrane, indicating significant increases in hydrogen peroxide release at the sites of particle contact with the neutrophil. The resting macrophage displayed a light, uniform precipitation of cerium over the cell surface and lining intracellular channels and endocytotic vesicles and vacuoles. Following particle exposure, there was no significant difference in the density or distribution of reaction product. These findings, together with previous studies of oxidative metabolism, suggest that alveolar macrophages do not release increased quantities of hydrogen peroxide during phagocytosis. In contrast to neutrophils, oxidative-dependent metabolic pathways may not be of primary importance for microbial killing by alveolar macrophages.
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