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TIR8, also known as single Ig IL-1-related receptor, is a member of the IL-1 receptor/Toll-like receptor (TLR) superfamily, which acts as an intracellular decoy for components of the signaling pathway. Here we report that Tir8 has a unique pattern of expression, which includes mucosal tissues and dendritic cells (DC). Tir8-deficient DC showed increased cytokine production in response to TLR agonists (lipopolysaccharide, CpG oligodeoxynucleotides). Tir8-deficient mice had normal susceptibility to systemic lipopolysaccharide toxicity and to i.p. or s.c. inflammation. However, Tir8-deficient mice were more susceptible to intestinal inflammation. Thus, TIR8 represents a negative pathway of regulation of the IL-1 receptor/TLR system, expressed in epithelial cells and DC, crucial for tuning inflammation in the gastrointestinal tract.

Intestinal inflammation in mice deficient in Tir8 , an inhibitory member of the IL-1 receptor family