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• W2123524820 abstract "Background. The success of many pathogens relies on their ability to circumvent the innate and adaptive immune defenses. How bacterial pathogens subvert adaptive immune defenses is not clear. Cholesterol-dependent cytolysins (CDCs) represent an expansive family of homologous pore-forming toxins that are produced by more than 20 gram-positive bacterial species. Listeriolysin O (LLO), a prototype CDC, is the main virulence factor of Listeria monocytogenes . Methods. We employed flow cytometric and microarray techniques to analyze the effect of LLO on T cell activation in vitro and in vivo. Results. In vivo and in vitro proliferation of CD4+T cells upon T cell receptor (TCR) activation was highly diminished in the presence of LLO or wild-type L. monocytogenes but not in the presence of LLO-deficient L. monocytogenes . This block in T cell proliferation was specific to T cell activation via the TCR and not by phorbol 12-myristate 13-acetate-ionomycin, which bypasses the proximal TCR signaling event. The results of microarray analysis suggest that LLO-induced T cell unresponsiveness is due to the induction of a calcium-nuclear factor of activated T cells-dependent transcriptional program that drives the expression of negative regulators of TCR signaling. Conclusion. These findings provide important insights into how bacterial toxins silence adaptive immune responses and thus enable prolonged survival of the pathogen in the host." @default.
• W2123524820 created "2016-06-24" @default.
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• W2123524820 date "2010-12-01" @default.
• W2123524820 modified "2023-10-17" @default.
• W2123524820 title "<i>Listeria monocytogenes</i>Induces T Cell Receptor Unresponsiveness through Pore‐Forming Toxin Listeriolysin O" @default.
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• W2123524820 doi "https://doi.org/10.1086/657145" @default.
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