Abstract
Recent studies in mice have demonstrated that TNF plays a critical role in mediating the TCDD-induced enhanced inflammatory response to intraperitoneal (i.p.) sheep red blood cells. The current studies were designed to evaluate the effects of TCDD on TNF production by ex-vivo peritoneal cells and a peritoneal macrophage cell line (IC-21) stimulated with LPS. In support of the hypothesis that TCDD can act directly on the peritoneal macrophage to increase TNF production, following pretreatment with TCDD, both ex-vivo peritoneal cells and IC-21 cells produced increased levels of bioactive TNF when stimulated with LPS. Flow cytometric analyses of IC-21 cells indicate that TCDD exposure increases intracellular production and secretion of TNF but does not alter levels of membrane associated TNF.
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