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Inflammatory mediators such as TNF-alpha, IL-6, and IL-1 are important in the pathogenesis of inflammatory bowel diseases and are regulated by the activation of NF-kappaB. The aim of the present study was to investigate whether the NF-kappaB essential modulator (NEMO)-binding domain (NBD) peptide, which has been shown to block the association of NEMO with the IkappaB kinasebeta subunit (IKKbeta) and inhibit NF-kappaB activity, reduces inflammatory injury in mice with colitis. Two colitis models were established by the following: 1) inclusion of dextran sulfate sodium salt (DSS) in the drinking water of the mice; and 2) a trinitrobenzene sulfonic acid enema. Marked NF-kappaB activation and expression of proinflammatory cytokines were observed in colonic tissues. The NBD peptide ameliorated colonic inflammatory injury through the down-regulation of proinflammatory cytokines mediated by NF-kappaB inhibition in both models. These results indicate that an IKKbeta-targeted NF-kappaB blockade using the NBD peptide could be an attractive therapeutic approach for inflammatory bowel disease.

Cutting Edge: The IκB Kinase (IKK) Inhibitor, NEMO-Binding Domain Peptide, Blocks Inflammatory Injury in Murine Colitis