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• W2128329047 abstract "The opportunistic pathogen Staphylococcus aureus is one of the major causes of health care-associated infections. S. aureus is primarily an extracellular pathogen, but it was recently reported to invade and replicate in several host cell types. The ability of S. aureus to persist within cells has been implicated in resistance to antimicrobials and recurrent infections. However, few staphylococcal proteins that mediate intracellular survival have been identified. Here we examine if EsxA and EsxB, substrates of the ESAT-6-like secretion system (Ess), are important during intracellular S. aureus infection. The Esx proteins are required for staphylococcal virulence, but their functions during infection are unclear. While isogenic S. aureus esxA and esxB mutants were not defective for epithelial cell invasion in vitro, a significant increase in early/late apoptosis was observed in esxA mutant-infected cells compared to wild-type-infected cells. Impeding secretion of EsxA by deleting C-terminal residues of the protein also resulted in a significant increase of epithelial cell apoptosis. Furthermore, cells transfected with esxA showed an increased protection from apoptotic cell death. A double mutant lacking both EsxA and EsxB also induced increased apoptosis but, remarkably, was unable to escape from cells as efficiently as the single mutants or the wild type. Thus, using in vitro models of intracellular staphylococcal infection, we demonstrate that EsxA interferes with host cell apoptotic pathways and, together with EsxB, mediates the release of S. aureus from the host cell." @default.
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• W2128329047 date "2014-10-01" @default.
• W2128329047 modified "2023-10-03" @default.
• W2128329047 title "Staphylococcal Esx Proteins Modulate Apoptosis and Release of Intracellular Staphylococcus aureus during Infection in Epithelial Cells" @default.
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• W2128329047 doi "https://doi.org/10.1128/iai.01576-14" @default.
• W2128329047 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4187876" @default.
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