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- W2035585086 abstract "Circulating neutrophils and monocytes form the first line of cellular defense against invading bacteria. Here, we describe a novel and specific mechanism of disabling and eliminating phagocytes by <i>Staphylococcus aureus</i>. Staphopain B (SspB) selectively cleaved CD11b on phagocytes, which rapidly acquired features of cell death. SspB-treated phagocytes expressed phosphatidylserine as well as annexin I and became permeable to propidium iodide, thus demonstrating distinctive features of both apoptosis and necrosis, respectively. The cell death observed was caspase and Syk tyrosine kinase independent, whilst cytochalasin D efficiently inhibited the staphopain-induced neutrophil killing. Neutrophil and monocyte cell death was not affected by integrin clustering ligands (ICAM-1 or fibrin) and was prevented, and even reversed, by IgG. This protective effect was dependent on the Fc fragment, collectively suggesting cooperation of the CD16 receptor and integrin Mac-1 (CD11b/CD18). We conclude that SspB, particularly in the presence of staphylococcal protein A, may reduce the number of functional phagocytes at infection sites, thus facilitating colonization and dissemination of <i>S. aureus</i>." @default.
- W2035585086 created "2016-06-24" @default.
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- W2035585086 date "2008-12-02" @default.
- W2035585086 modified "2023-10-18" @default.
- W2035585086 title "A New Pathway of Staphylococcal Pathogenesis: Apoptosis-Like Death Induced by Staphopain B in Human Neutrophils and Monocytes" @default.
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- W2035585086 doi "https://doi.org/10.1159/000181014" @default.
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