The aim of this study was to evaluate the expression pattern of Toll-like receptors (TLRs) in the pouch mucosa of ulcerative colitis patients in comparison with that in the ileum mucosa of noninflammatory bowel disease patients. Pouch mucosal biopsy specimens were collected from postoperative patients who had undergone surgery for ulcerative colitis. Normal ileum specimens were collected from colon cancer patients. The specimens were assessed by immunofluorescence histochemistry using TLR2, TLR3, TLR4, and TLR5 polyclonal antibodies. The normal ileal mucosa constitutively expressed TLR3 and TLR5, whereas TLR2 and TLR4 were barely detectable. In the mucosa of active pouchitis, TLR2 and TLR4 was strongly upregulated, and TLR4 was upregulated even in a noninflamed pouch. No TLR3 or TLR5 expression was detectable. These data suggest that pouchitis may be associated with distinctive changes in selective TLR expression in the pouch mucosa, and that TLR4 alterations in the innate response system may contribute to the pathogenesis of these disorders in particular.
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