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- W2024154157 abstract "To examine the potential for generating toxic nitrogen oxides during the immune response, rates of formation and consumption of NO, O2, and O2- were measured in murine macrophage-like RAW264.7 cells. Cellular kinetic parameters for NO and O2 were obtained by monitoring their time-dependent concentrations in a closed chamber, and net cellular synthesis of O2- was quantified from ferricytochrome c reduction in cultures where NO synthesis was inhibited. Also measured was the photosensitive generation of O2- in the culture media. Unactivated cells (without NO synthesis) had an O2 consumption rate of 32 ± 3 pmol s-1 (106 cells)-1, typical of mammalian cells. Also typical was that adding NO rapidly and reversibly inhibited respiration. Activated cells synthesized NO at a rate of 4.9 ± 0.6 pmol s-1 (106 cells)-1. When NO synthesis was inhibited, they consumed three times as much O2 as unactivated cells [108 ± 17 pmol s-1 (106 cells)-1]; however, O2 consumption of activated cells exposed to 1 μM NO was calculated to be comparable to that of NO-free unactivated cells. Rates of intracellular NO consumption were small, implying that enzymatic consumption does little to limit net NO synthesis by macrophages. Accounting for O2- generation in the culture media resulted in net rates of cellular O2- synthesis smaller than previously reported; the rate was 6% of NO synthesis in activated cells and was undetectable in unactivated cells." @default.
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- W2024154157 date "2005-02-08" @default.
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- W2024154157 title "Nitric Oxide, Oxygen, and Superoxide Formation and Consumption in Macrophage Cultures" @default.
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- W2024154157 doi "https://doi.org/10.1021/tx049879c" @default.
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