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The Journal of Immunology, Vol 154, Issue 8 4081-4090, Copyright © 1995 by American Association of Immunologists
ARTICLES |
M Jordan, IG Otterness, R Ng, A Gessner, M Rollinghoff and HU Beuscher
Institute for Clinical Microbiology and Immunology, University of Erlangen/Nurnberg, Germany.
IL-1 is a potent cytokine that promotes host defense and inflammation. These processes may be modulated by an IL-1 receptor antagonist (IL- 1Ra) that binds to and blocks IL-1 receptors. The objective of this study was to define the cellular origin and regulation of IL-1Ra production during bacterial infection. Oral infection of mice with Yersinia enterocolitica resulted in expression of IL-1Ra mRNA and synthesis of IL-1Ra in Peyer's patches (PP), the local site of infection, as well as in noninfected organs such as spleens. By immunostaining, recruited circulating neutrophils were identified to be the primary source of IL-1Ra in tissues. Only approximately 20% of the IL-1Ra-staining cells were accounted for by inflammatory macrophages. Strikingly, neutralization of IL-6 by anti-IL-6 antiserum caused a suppression of both IL-1Ra mRNA in PP and synthesis of IL-1Ra in circulating neutrophils. Confirmatory evidence that IL-6 participates in the generation of IL-1Ra was obtained when rIL-6 induced, and anti- IL-6 antiserum blocked, IL-1Ra expression in cultures of macrophage and polymorphonuclear leukocytes (PMN). These findings suggest that IL-6 induced induction of IL-1Ra may provide a negative feedback loop, facilitating resolution of the inflammatory response locally and presumably at remote sites of infection.
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