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• W2078368996 abstract "While classical interactions of bacterial superantigens (SAgs) with antigen presenting cells and T cells have been studied intensively, the potential interactions of SAgs with granulocytes (PMNs) have gained much less attention. We investigated if in the bovine system SAgs have any direct or indirect influence on the fate of granulocytes, which are among those cells primarily responsible for the elimination of superantigen-producing bacteria. The tested SAgs (SEA, SEB) had no apparent direct effect on PMN viability (neutrophils and eosinophils). However, in the presence of blood mononuclear cells (MNCs), SAgs led to an accelerated death of neutrophils but not of eosinophils. Compared to medium controls, in SAg-stimulated cultures only about 20-50% of the neutrophils survived after 24 hours in vitro. Accelerated death of neutrophils required the presence of at least 10% MNC and started between 2.5-24 h after initiation of the co-culture between MNC and PMN. Minimal effective SEA concentrations ranged between 10-100 pg/l (SEB 0.1-10 ng/l). The effect could be mimicked by culture supernatants of SAg-stimulated MNCs, suggesting that direct cell-cell interactions are not required for the killing. In the human system, where we tested the role of TNF-alpha, an antibody specific for this cytokine was not able to abolish the death of human neutrophils. Brefeldin A, an inhibitor of golgi transport and cytokine secretion, which blocked the SAg-induced activation of bovine MNC did not abolish the killing of neutrophils. Blocking of nitric oxide generation or PGE2 synthesis also could not alter the SAg-induced killing of bovine neutrophils. The observed indirect negative effects of SAgs on neutrophils may provide new insights in mechanisms by which superantigens modulate the hosts immune response." @default.
• W2078368996 created "2016-06-24" @default.
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• W2078368996 date "2000-11-01" @default.
• W2078368996 modified "2023-09-23" @default.
• W2078368996 title "Superantigen-Dependent Accelerated Death of Bovine Neutrophilic Granulocytes in vitro is Mediated by Blood Mononuclear Cells" @default.
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• W2078368996 doi "https://doi.org/10.1016/s0171-2985(00)80106-0" @default.
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