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The Journal of Immunology, Vol 151, Issue 7 3767-3774, Copyright © 1993 by American Association of Immunologists
ARTICLES |
CM Hogaboam, AD Befus and JL Wallace
Gastrointestinal Research Group, Faculty of Medicine, University of Calgary, Alberta, Canada.
Release of inflammatory mediators by mast cells can be modulated by certain cytokines and by nitric oxide. An in vitro platelet aggregation bioassay was used to assess the effects of interleukin-1 beta (IL-1 beta) on the release of platelet-activating factor and nitric oxide from resting or ionophore-activated peritoneal mast cells (PMC) from rat. PMC spontaneously released a substance that inhibits thrombin- stimulated platelet aggregation. The activity of this substance is abolished by addition of hemoglobin to the platelet suspension and augmented by preincubation of the PMC with L-arginine, suggesting that it is nitric oxide. Within minutes, IL-1 beta concentration-dependently (1 pg/ml-100 ng/ml) enhanced the release from activated PMC of nitric oxide, as measured by its ability to inhibit thrombin-induced platelet aggregation, and as confirmed with a biochemical assay for nitrite. This action of IL-1 beta was inhibited by pretreatment of PMC with a calmodulin antagonist (calmidazolium), an IL-1 receptor antagonist, or either of two nitric oxide synthase inhibitors (L-NAME and LY-83583). IL-1 beta also inhibited the release of platelet-activating factor from PMC through a nitric-oxide-dependent mechanism. These results demonstrate that IL-1 beta is a potent and rapid-acting modulator of mast cell reactivity, stimulating nitric oxide release while inhibiting the production of platelet-activating factor.
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