Conflicts of interest: Dr. Yoshida: Consultant-Kissei Pharmaceutical, Astellas, Pfizer; Speaker honorarium-Kissei Pharmaceutical, Astellas, Pfizer, Kyorin Pharmaceutical; Trial participation- Kissei Pharmaceutical, Astellas, Pfizer. Dr. Chapple: Consultant- Pfizer, Astellas, Novartis, Tanabe, Recordati, ONO; Speaker honorarium- Pfizer, Astellas, Ranbaxy; Trial participation- Pfizer, Astellas, Tanabe, Recordati; Research grant- Pfizer, Astellas. Dr. Sellers: Research grant- Pfizer. Dr. McKay: Research grant- Pfizer.
Original Basic Science Article
Article first published online: 11 FEB 2010
Copyright © 2010 Wiley-Liss, Inc.
Neurourology and Urodynamics
Volume 29, Issue 7, pages 1320–1325, September 2010
How to Cite
Masunaga, K., Chapple, C. R., McKay, N. G., Yoshida, M. and Sellers, D. J. (2010), The β3-adrenoceptor mediates the inhibitory effects of β-adrenoceptor agonists via the urothelium in pig bladder dome. Neurourol. Urodyn., 29: 1320–1325. doi: 10.1002/nau.20838
Karl-Erik Andersson led the review process.
- Issue published online: 7 SEP 2010
- Article first published online: 11 FEB 2010
- Manuscript Accepted: 29 SEP 2009
- Manuscript Received: 4 AUG 2009
- β-adrenoceptor agonist;
- β-adrenoceptor antagonist;
- pig bladder;
Relaxation of detrusor muscle via β-adrenoceptors may contribute to urine storage during bladder filling. Thus there is increasing interest in β-adrenoceptor agonists as a potential treatment for detrusor overactivity. The role of the urothelium in bladder responses to β-adrenoceptor agonists is not yet clear, although we have shown that these agonists have a greater inhibitory effect on detrusor contraction when the urothelium is intact. The aim was to determine which β-adrenoceptor subtype is involved in this effect.
Paired strips of pig bladder dome mucosa-intact and mucosa-denuded, were mounted in tissue baths. Relaxation responses were obtained to β-adrenoceptor agonists (isoprenaline, dobutamine, salbutamol or BRL37344) in carbachol pre-contracted tissues. Inhibitory effects were studied by obtaining concentration-response curves (CRCs) to carbachol in the presence and absence of β-adrenoceptor agonists. The inhibitory effects of isoprenaline were also studied following incubation with β-adrenoceptor antagonists (propranolol, CGP20712, ICI-118, 551 or SR 59230A; non selected, β1, β2 and β3 selective respectively).
isoprenaline, dobutamine, salbutamol and BRL37344 all relaxed carbachol pre-contracted tissues and responses were similar in intact and denuded strips. In inhibition experiments, β-adrenoceptor agonists caused rightward shifts of carbachol CRCs. In intact strips the shift was greater with isoprenaline and BRL37344, but not with dobutamine or salbutamol. This increased shift was still observed in tissues pre-incubated with propranolo, CGP20712 and ICI-118, 551, but not with SR 59230A.
β3-adrenoceptors are involved in mediating inhibitory effects of β-adrenoceptor agonists on detrusor contractions via the urothelium in pig bladder dome. Neurourol. Urodynam. 29:1320–1325, 2010. © 2010 Wiley-Liss, Inc.