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The goals of this study were to examine 1) the effects of blocking proteinase-activated receptor-2 (PAR2) on the exaggerated bladder activity and pain evoked by cystitis and 2) the underlying mechanisms responsible for the role of PAR2 in regulating cystic sensory activity. The protein expression of PAR2 was amplified in rats with cystitis by inducing it with systemic administration of cyclophosphamide (CYP) as compared with control rats. Blocking PAR2 by intrathecal infusion of PAR2 antagonist FSLLRY-NH2 attenuated bladder hyperactivity and pain. In addition, blocking PAR2 attenuated the transient receptor potential A1 (TRPA1) signal pathway, whereas inhibition of the TRPA1 decreased bladder hyperactivity and pain. The data revealed specific signaling pathways leading to CYP-induced bladder hyperactivity and pain, including the activation of PAR2 and TRPA1. Inhibition of these pathways alleviates cystic pain. Targeting one or more of these signaling molecules may present new opportunities for treatment and management of overactive bladder and pain often observed in cystitis.<\/jats:p>","DOI":"10.1515\/tnsci-2016-0020","type":"journal-article","created":{"date-parts":[[2016,12,23]],"date-time":"2016-12-23T19:52:28Z","timestamp":1482522748000},"page":"133-138","source":"Crossref","is-referenced-by-count":12,"title":["Blocking PAR2 alleviates bladder pain and hyperactivity via TRPA1 signal"],"prefix":"10.1515","volume":"7","author":[{"given":"Daihui","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400012, P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nian","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400012, P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mao","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400012, P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simin","family":"Liang","sequence":"additional","affiliation":[{"name":"Department of Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400012, P.R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2016,11,27]]},"reference":[{"key":"2021110909184055972_j_tnsci-2016-0020_ref_001_w2aab3b7c83b1b6b1ab2b1b1Aa","doi-asserted-by":"crossref","unstructured":"Hanno P.M., Erickson D., Moldwin R., Faraday M.M., Diagnosis and treatment of interstitial cystitis\/bladder pain syndrome: AUA guideline amendment, J. 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