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- W1998157460 abstract "Tumor necrosis factor receptor (TNFR) p55-knockout (KO) mice are susceptible profoundly to Salmonella infection. One day after peritoneal inoculation, TNFR-KO mice harbor 1,000-fold more bacteria in liver and spleen than wild-type mice despite the formation of well organized granulomas. Macrophages from TNFR-KO mice produce abundant quantities of reactive oxygen and nitrogen species in response to Salmonella but nevertheless exhibit poor bactericidal activity. Treatment with IFN-gamma enhances killing by wild-type macrophages but does not restore the killing defect of TNFR-KO cells. Bactericidal activity of macrophages can be abrogated by a deletion in the gene encoding TNFalpha but not by saturating concentrations of TNF-soluble receptor, suggesting that intracellular TNFalpha can regulate killing of Salmonella by macrophages. Peritoneal macrophages from TNFR-KO mice fail to localize NADPH oxidase-containing vesicles to Salmonella-containing vacuoles. A TNFR-KO mutation substantially restores virulence to an attenuated mutant bacterial strain lacking the type III secretory system encoded by Salmonella pathogenicity island 2 (SPI2), suggesting that TNFalpha and SPI2 have opposing actions on a common pathway of vesicular trafficking. TNFalpha-TNFRp55 signaling plays a critical role in the immediate innate immune response to an intracellular pathogen by optimizing the delivery of toxic reactive oxygen species to the phagosome." @default.
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- W1998157460 date "2001-02-13" @default.
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- W1998157460 title "Defective localization of the NADPH phagocyte oxidase to<i>Salmonella</i>-containing phagosomes in tumor necrosis factor p55 receptor-deficient macrophages" @default.
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- W1998157460 doi "https://doi.org/10.1073/pnas.041618998" @default.
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