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Pattern recognition receptors [Toll-like receptors (TLRs) and Nod-like receptors (NLRs)] that recognize pathogen- and\/or damage-associated molecular patterns (PAMPs and\/or DAMPs, respectively) are key components of the innate immune system that coordinates the production (TLRs) and maturation (NLRs) of proinflammatory IL-1\u03b2. Despite multiple studies of TLRs in the bladder, none have investigated NLRs beyond one small survey. We now demonstrate that NLRP3 and NLRC4, and their binding partners apoptosis-associated speck-like protein containing a COOH-terminal caspase recruitment domain (ASC) and NLR family apoptosis inhibitory protein (NAIP), are expressed in the bladder and localized predominantly to the urothelia. Activated NLRs form inflammasomes that activate caspase-1. Placement of a NLRP3- or NLRC4-activating PAMP or NLRP3-activating DAMPs into the lumen of the bladder stimulated caspase-1 activity. To investigate inflammasomes in vivo, we induced cystitis with cyclophosphamide (CP, 150 mg\/kg ip) in the presence or absence of the inflammasome inhibitor glyburide. Glyburide completely blocked CP-induced activation of caspase-1 and the production of IL-1\u03b2 at 4 h. At 24 h, glyburide reduced two markers of inflammation by 30\u201350% and reversed much of the inflammatory morphology. Furthermore, glyburide reversed changes in bladder physiology (cystometry) induced by CP. In conclusion, NLRs\/inflammasomes are present in the bladder urothelia and respond to DAMPs and PAMPs, whereas NLRP3 inhibition blocks bladder dysfunction in the CP model. The coordinated response of NLRs and TLRs in the urothelia represents a first-line innate defense that may provide an important target for pharmacological intervention.<\/jats:p>","DOI":"10.1152\/ajprenal.00297.2013","type":"journal-article","created":{"date-parts":[[2013,11,28]],"date-time":"2013-11-28T03:51:22Z","timestamp":1385610682000},"page":"F299-F308","source":"Crossref","is-referenced-by-count":66,"title":["Inflammasomes are important mediators of cyclophosphamide-induced bladder inflammation"],"prefix":"10.1152","volume":"306","author":[{"suffix":"Jr.","given":"Francis M.","family":"Hughes","sequence":"first","affiliation":[{"name":"Department of Urology, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nivardo P.","family":"Vivar","sequence":"additional","affiliation":[{"name":"Department of Urology, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James G.","family":"Kennis","sequence":"additional","affiliation":[{"name":"Department of Urology, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeffery D.","family":"Pratt-Thomas","sequence":"additional","affiliation":[{"name":"Department of Urology, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Danielle W.","family":"Lowe","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brooke E.","family":"Shaner","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutical and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul J.","family":"Nietert","sequence":"additional","affiliation":[{"name":"Department of Public Health Sciences, Medical University of South Carolina, Charleston, South Carolina;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura S.","family":"Spruill","sequence":"additional","affiliation":[{"name":"Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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