Salmonella pathogenicity island 2-dependent evasion of the phagocyte NADPH oxidase

Andrés Vazquez-Torres, Yisheng Xu, Jessica Jones-Carson, David W. Holden, Scott M. Lucia, Mary C. Dinauer, Pietro Mastroeni, Ferric C. Fang

Research output: Contribution to journalArticlepeer-review

214 Scopus citations


A type III protein secretion system encoded by Salmonella pathogenicity island 2 (SPI2) has been found to be required for virulence and survival within macrophages. Here, SPI2 was shown to allow Salmonella typhimurium to avoid NADPH oxidase-dependent killing by macrophages. The ability of SPI2- mutant bacteria to survive in macrophages and to cause lethal infection in mice was restored by abrogation of the NADPH oxidase-dependent respiratory burst. Ultrastructural and immunofluorescence microscopy demonstrated efficient localization of the NADPH oxidase in the proximity of vacuoles containing. SP12-mutant but not wild-type bacteria, suggesting that SP12 interferes with trafficking of oxidase-containing vesicles to the phagosome.

Original languageEnglish
Pages (from-to)1655-1658
Number of pages4
Issue number5458
StatePublished - Mar 3 2000


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