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• W2146342638 endingPage "6177" @default.
• W2146342638 startingPage "6171" @default.
• W2146342638 abstract "ABSTRACT Streptolysin O (SLO), a major virulence factor of pyogenic streptococci, binds to cholesterol in the membranes of eukaryotic cells and oligomerizes to form large transmembrane pores. While high toxin doses are rapidly cytocidal, low doses are tolerated because a limited number of lesions can be resealed. Here, we report that at sublethal doses, SLO activates primary murine bone marrow-derived mast cells to degranulate and to rapidly induce or enhance the production of several cytokine mRNAs, including tumor necrosis factor alpha (TNF-α). Mast cell-derived TNF-α plays an important protective role in murine models of acute inflammation, and the production of this cytokine was analyzed in more detail. Release of biologically active TNF-α peaked ∼4 h after stimulation with SLO. Production of TNF-α was blunted upon depletion of protein kinase C by pretreatment of the cells with phorbol-12 myristate-13 acetate. Transient permeabilization of mast cells with SLO also led to the activation of the stress-activated protein kinases p38 mitogen-activated protein (MAP) kinase and c-jun N-terminal kinase (JNK), and inhibition of p38 MAP kinase markedly reduced production of TNF-α. In contrast, secretion of preformed granule constituents triggered by membrane permeabilization was not dependent on p38 MAP kinase or on protein kinase C. Thus, transcriptional activation of mast cells following transient permeabilization might contribute to host defense against infections via the beneficial effects of TNF-α. However, hyperstimulation of mast cells might also lead to overproduction of TNF-α, which would then promote the development of toxic streptococcal syndromes." @default.
• W2146342638 created "2016-06-24" @default.
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• W2146342638 date "2003-11-01" @default.
• W2146342638 modified "2023-09-30" @default.
• W2146342638 title "The Streptococcal Exotoxin Streptolysin O Activates Mast Cells To Produce Tumor Necrosis Factor Alpha by p38 Mitogen-Activated Protein Kinase- and Protein Kinase C-Dependent Pathways" @default.
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• W2146342638 doi "https://doi.org/10.1128/iai.71.11.6171-6177.2003" @default.
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