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• W2033287913 abstract "Pseudomonas. aeruginosa (PA) is a leading cause of nosocomial pneumonia in patients receiving mechanical ventilation with hyperoxia. Exposure to supraphysiological concentrations of reactive oxygen species during hyperoxia may result in macrophage damage that reduces their ability to phagocytose PA. We tested this hypothesis in cultured macrophage-like RAW 264.7 cells and alveolar macrophages from mice exposed to hyperoxia. Exposure to hyperoxia induced a similarly impaired phagocytosis of both the mucoid and the nonmucoid forms of PA in alveolar macrophages and RAW cells. Compromised PA phagocytosis was associated with cytoskeleton disorganization and actin oxidation in hyperoxic macrophages. To test whether moderate concentrations of O2 limit the loss of phagocytic function induced by ≥ 95% O2, mice and RAW cells were exposed to 65% O2. Interestingly, although the resulting lung injury/cell proliferation was not significant, exposure to 65% O2 resulted in a marked reduction in PA phagocytosis that was comparable to that of ≥ 95% O2. Treatment with antioxidants, even post hyperoxic exposure, preserved actin cytoskeleton organization and phagocytosis of PA. These data suggest that hyperoxia reduces macrophage phagocytosis through effects on actin functions which can be preserved by antioxidant treatment. In addition, administration of moderate rather than higher concentrations of O2 does not improve macrophage phagocytosis of PA." @default.
• W2033287913 created "2016-06-24" @default.
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• W2033287913 date "2007-05-01" @default.
• W2033287913 modified "2023-10-14" @default.
• W2033287913 title "Antioxidants preserve macrophage phagocytosis of Pseudomonas aeruginosa during hyperoxia" @default.
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• W2033287913 doi "https://doi.org/10.1016/j.freeradbiomed.2007.01.031" @default.
• W2033287913 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3104269" @default.
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