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The Journal of Immunology, Vol 153, Issue 6 2618-2623, Copyright © 1994 by American Association of Immunologists
ARTICLES |
S Florquin, Z Amraoui, D Abramowicz and M Goldman
Multidisciplinary Laboratory of Biomedical Research, Free University of Brussels, Belgium.
Staphylococcal enterotoxin B (SEB) is a bacterial superantigen that induces the production of several pro-inflammatory cytokines, leading to a self-limited shock. In the present study, we show that SEB also triggers the systemic release of IL-10, an anti-inflammatory and immunosuppressive cytokine. Serum IL-10 was undetectable (< 1000 pg/ml) in control BALB/c mice and rose to 8500 +/- 2850 pg/ml (mean +/- SEM) 4 h after injection of 100 micrograms SEB. Cell depletion experiments and analysis of IL-10 mRNA expression indicated that CD4+ cells played a major role in SEB-induced IL-10 production. Pretreatment of mice with neutralizing anti-IL-10 mAb before SEB challenge did not modify the release of TNF but led to increased and sustained IL-2 and IFN-gamma serum levels. Furthermore, although no lethality occurred in mice injected with SEB and control mAb, injection of anti-IL-10 mAb before SEB resulted in a 30% lethality (p < 0.05). This lethality was completely prevented by anti-IFN-gamma mAb injection, indicating that IFN-gamma plays a crucial role in the increased toxicity of SEB in anti- IL-10 mAb-injected mice. We conclude that SEB induces the production of IL-10 by CD4+ cells in vivo and that endogenous IL-10 plays an important immunoregulatory role in this model by down-regulating IL-2 and IFN-gamma production.
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