IL-1 beta -converting enzyme (caspase-1) in intestinal inflammation

Proceedings of the National Academy of Sciences of the United States of America
Britta SiegmundCharles A Dinarello

Abstract

IL-1 beta-converting enzyme (ICE; caspase-1) is the intracellular protease that cleaves the precursors of IL-1 beta and IL-18 into active cytokines. In the present study, the effect of ICE deficiency was evaluated during experimental colitis in mice. In acute dextran sulfate sodium-induced colitis, ICE-deficient (ICE KO) mice exhibited a greater than 50% decrease of the clinical scores weight loss, diarrhea, rectal bleeding, and colon length, whereas daily treatment with IL-1 receptor antagonist revealed a modest reduction in colitis severity. To further characterize the function of ICE and its role in intestinal inflammation, chronic colitis was induced over a 30-day time period. During this chronic time course, ICE KO mice exhibited a near complete protection, as reflected by significantly reduced clinical scores and almost absent histological signs of colitis. Consistently, colon shortening occurred only in dextran sulfate sodium-exposed wild-type mice but not in ICE KO mice. Protection was accompanied by reduced spontaneous release of the proinflammatory cytokines IL-18, IL-1 beta, and IFN-gamma from total colon cultures. In addition, flow cytometric analysis of isolated mesenteric lymph node cells revealed evidence of redu...Continue Reading

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