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• W2023504338 abstract "The ability of mineral oil-elicited rat peritoneal macrophages to release hydrogen peroxide (H2O2) to the extracellular medium was measured in the presence and absence of rat lymphoma cells grown in tissue culture, and in the presence of phorbol myristate acetate (PMA). Horseradish peroxidase (HRP)-catalyzed oxidation of scopoletin or phenol red was used to measure H2O2 release during incubation of cells in monolayer culture for periods up to 24 h. Macrophages appeared to release H2O2 with or without PMA, although PMA greatly increased the amount of H2O2 released in short (1 to 4 h) incubations. Tumor cells did not replace PMA as a triggering agent for H2O2 release. Instead, tumor cells inhibited H2O2 release. The probable basis for inhibition was competition between macrophages and tumor cells for the supply of oxygen (O2). Tumor cells did not inhibit H2O2 release when the O2 concentration was held constant. The rates at which macrophages took up O2 and released H2O2 were proportional to the O2 concentration, as measured with the O2 electrode. Rates of H2O2 release could be calculated from the difference in the rate constants for O2 uptake measured in the presence of two different extracellular H2O2-consuming systems (HRP-scopoletin vs catalase). PMA-stimulated uptake of O2 and release of H2O2 were highest in a small subpopulation of macrophages, obtained at the lowest-density position on gradients of bovine serum albumin. These cells also released H2O2 in the absence of PMA. Tumor cells had no effect on the rate constants for O2 uptake and H2O2 release by the unfractionated macrophages or the macrophage subpopulations." @default.
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• W2023504338 date "1982-05-01" @default.
• W2023504338 modified "2023-09-22" @default.
• W2023504338 title "Hydrogen peroxide release by rat peritoneal macrophages in the presence and absence of tumor cells" @default.
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• W2023504338 doi "https://doi.org/10.1016/0003-9861(82)90096-0" @default.
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