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- W2155228106 abstract "ABSTRACT Pseudomonas aeruginosa is a gram-negative opportunistic pathogen that is cytotoxic towards a variety of eukaryotic cells. To investigate the effect of this bacterium on macrophages, we infected J774A.1 cells and primary bone-marrow-derived murine macrophages with the P. aeruginosa strain PA103 in vitro. PA103 caused type-III-secretion-dependent killing of macrophages within 2 h of infection. Only a portion of the killing required the putative cytotoxin ExoU. By three criteria, terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling assays, cytoplasmic nucleosome assays, and Hoechst staining, the ExoU-independent but type-III-secretion-dependent killing exhibited features of apoptosis. Extracellular bacteria were capable of inducing apoptosis, and some laboratory and clinical isolates of P. aeruginosa induced significantly higher levels of this form of cell death than others. Interestingly, HeLa cells but not Madin-Darby canine kidney cells were susceptible to type-III-secretion-mediated apoptosis under the conditions of these assays. These findings are consistent with a model in which the P. aeruginosa type III secretion system transports at least two factors that kill macrophages: ExoU, which causes necrosis, and a second, as yet unidentified, effector protein, which induces apoptosis. Such killing may contribute to the ability of this organism to persist and disseminate within infected patients." @default.
- W2155228106 created "2016-06-24" @default.
- W2155228106 creator A5003818696 @default.
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- W2155228106 date "1999-10-01" @default.
- W2155228106 modified "2023-10-11" @default.
- W2155228106 title "<i>Pseudomonas aeruginosa</i> Induces Type-III-Secretion-Mediated Apoptosis of Macrophages and Epithelial Cells" @default.
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- W2155228106 doi "https://doi.org/10.1128/iai.67.10.5530-5537.1999" @default.
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