Abstract:
OBJECTIVES:To investigate the correlation of transient receptor potential vanilloid subfamily 1 (TRPV1) mRNA expression levels and the clinical outcome of intravesical resiniferatoxin treatment in patients with idiopathic detrusor overactivity (IDO), as such treatment with vanilloids can be effective for DO. PATIENTS AND METHODS:In all, 28 patients with IDO refractory to anticholinergics were enrolled and treated with four weekly intravesical instillations of 10 nm resiniferatoxin. Eleven patients having ureteroscopic surgery served as controls. Two bladder wall biopsies were taken from the posterior wall by rigid cystoscopy. TRPV1 expression in the bladder wall samples was determined by individual quantitative reverse transcription-polymerase chain reaction, and immunohistochemical staining. Responders to the therapy were defined as those with an improvement in an urgency scale by >/=1, and with improved general satisfaction. Baseline TRPV1 expression was compared between responders, nonresponders and controls. RESULTS:At 3 months, 14 patients (50%) were responders and in the other 14 the treatment failed (nonresponders). Bladder biopsies were available in seven responders and 11 nonresponders. Transcript levels before treatment correlated significantly with the therapeutic effect of resiniferatoxin (P = 0.004), with higher TRPV1 mRNA expression in responders (median 1.50, range 0.89-2.78) than nonresponders (0.74, 0.34-1.32). Responders also had higher TRPV1 expression levels than a control group (P = 0.067), but the TRPV1 transcript levels of nonresponders were not significantly different from those of the control (P = 0.367). CONCLUSION:Successful intravesical resiniferatoxin treatment is closely associated with the over-expression of TRPV1 in the bladder mucosa and submucosa in patients with IDO.
journal_name
BJU Intjournal_title
BJU internationalauthors
Liu HT,Kuo HCdoi
10.1111/j.1464-410X.2007.07151.xsubject
Has Abstractpub_date
2007-11-01 00:00:00pages
1086-90issue
5eissn
1464-4096issn
1464-410Xpii
BJU7151journal_volume
100pub_type
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