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Title: Salmonella Typhimurium Impedes Innate Immunity with a Mast-Cell-Suppressing Protein Tyrosine Phosphatase, SptP
Authors: Choi, H.W.
Brooking-Dixon, R.
Neupane, S.
Lee, C.-J.
Miao, E.A.
Staats, H.F.
Abraham, S.N. 
Issue Date: 12-Dec-2013
Citation: Choi, H.W., Brooking-Dixon, R., Neupane, S., Lee, C.-J., Miao, E.A., Staats, H.F., Abraham, S.N. (2013-12-12). Salmonella Typhimurium Impedes Innate Immunity with a Mast-Cell-Suppressing Protein Tyrosine Phosphatase, SptP. Immunity 39 (6) : 1108-1120. ScholarBank@NUS Repository.
Abstract: The virulence of Salmonella is linked to its invasive capacity and suppression of adaptive immunity. This does not explain, however, the rapid dissemination of the pathogen after it breaches the gut. In our study, S. Typhimurium suppressed degranulation of local mast cells (MCs), resulting in limited neutrophil recruitment and restricting outflow of vascular contents into infection sites, thus facilitating bacterial spread. MC suppression was mediated by secreted effector protein (SptP), which shares structural homology with Yersinia YopH. SptP functioned by dephosphorylating the vesicle fusion protein N-ethylmalemide-sensitive factor and by blocking phosphorylation of Syk. Without SptP, orally challenged S. Typhimurium failed to suppress MC degranulation and exhibited limited colonization of the mesenteric lymph nodes. Administration of SptP to sites of E.coli infection markedly enhanced its virulence. Thus, SptP-mediated inactivation of local MCs is a powerful mechanism utilized by S. Typhimurium to impede early innate immunity. © 2013 Elsevier Inc.
Source Title: Immunity
ISSN: 10747613
DOI: 10.1016/j.immuni.2013.11.009
Appears in Collections:Staff Publications

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