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- W2167698579 abstract "The role of NADPH oxidase activation in pneumonia is complex because reactive oxygen species contribute to both microbial killing and regulation of the acute pulmonary infiltrate. The relative importance of each role remains poorly defined in community-acquired pneumonia.We evaluated the contribution of NADPH oxidase-derived reactive oxygen species to the pathogenesis of pneumococcal pneumonia, addressing both the contribution to microbial killing and regulation of the inflammatory response.Mice deficient in the gp91(phox) component of the phagocyte NADPH oxidase were studied after pneumococcal challenge.gp91(phox)(-/-) mice demonstrated no defect in microbial clearance as compared with wild-type C57BL/6 mice. A significant increase in bacterial clearance from the lungs of gp91(phox)(-/-) mice was associated with increased numbers of neutrophils in the lung, lower rates of neutrophil apoptosis, and enhanced activation. Marked alterations in pulmonary cytokine/chemokine expression were also noted in the lungs of gp91(phox)(-/-) mice, characterized by elevated levels of tumor necrosis factor-alpha, KC, macrophage inflammatory protein-2, monocyte chemotactic protein-1, and IL-6. The greater numbers of neutrophils in gp91(phox)(-/-) mice were not associated with increased lung injury. Levels of neutrophil elastase in bronchoalveolar lavage were not decreased in gp91(phox)(-/-) mice.During pneumococcal pneumonia, NADPH oxidase-derived reactive oxygen species are redundant for host defense but limit neutrophil recruitment and survival. Decreased NADPH oxidase-dependent reactive oxygen species production is well tolerated and improves disease outcome during pneumococcal pneumonia by removing neutrophils from the tight constraints of reactive oxygen species-mediated regulation." @default.
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- W2167698579 date "2008-04-15" @default.
- W2167698579 modified "2023-09-26" @default.
- W2167698579 title "Reactive Oxygen Species Regulate Neutrophil Recruitment and Survival in Pneumococcal Pneumonia" @default.
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- W2167698579 doi "https://doi.org/10.1164/rccm.200707-990oc" @default.
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