The beta3-adrenoceptor mediates the inhibitory effects of beta-adrenoceptor agonists via the urothelium in pig bladder dome

Koichi Masunaga, Christopher R. Chapple, Neil G. McKay, Masaki Yoshida, Donna J Sellers

Research output: Contribution to journalArticleResearchpeer-review

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Abstract

AIMS: 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.

METHODS: 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, β(1), β(2) and β(3) selective respectively).

RESULTS: 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.

CONCLUSIONS: β(3)-adrenoceptors are involved in mediating inhibitory effects of β-adrenoceptor agonists on detrusor contractions via the urothelium in pig bladder dome.

Original languageEnglish
Pages (from-to)1320-5
Number of pages6
JournalNeurourology and Urodynamics
Volume29
Issue number7
DOIs
Publication statusPublished - Sep 2010

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Urothelium
Adrenergic Receptors
Urinary Bladder
Swine
Carbachol
Isoproterenol
Dobutamine
Albuterol
Mucous Membrane
Muscle Relaxation
Baths
Propranolol
Urine

Cite this

Masunaga, Koichi ; Chapple, Christopher R. ; McKay, Neil G. ; Yoshida, Masaki ; Sellers, Donna J. / The beta3-adrenoceptor mediates the inhibitory effects of beta-adrenoceptor agonists via the urothelium in pig bladder dome. In: Neurourology and Urodynamics. 2010 ; Vol. 29, No. 7. pp. 1320-5.
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title = "The beta3-adrenoceptor mediates the inhibitory effects of beta-adrenoceptor agonists via the urothelium in pig bladder dome",
abstract = "AIMS: 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.METHODS: 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, β(1), β(2) and β(3) selective respectively).RESULTS: 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.CONCLUSIONS: β(3)-adrenoceptors are involved in mediating inhibitory effects of β-adrenoceptor agonists on detrusor contractions via the urothelium in pig bladder dome.",
author = "Koichi Masunaga and Chapple, {Christopher R.} and McKay, {Neil G.} and Masaki Yoshida and Sellers, {Donna J}",
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The beta3-adrenoceptor mediates the inhibitory effects of beta-adrenoceptor agonists via the urothelium in pig bladder dome. / Masunaga, Koichi; Chapple, Christopher R.; McKay, Neil G.; Yoshida, Masaki; Sellers, Donna J.

In: Neurourology and Urodynamics, Vol. 29, No. 7, 09.2010, p. 1320-5.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The beta3-adrenoceptor mediates the inhibitory effects of beta-adrenoceptor agonists via the urothelium in pig bladder dome

AU - Masunaga, Koichi

AU - Chapple, Christopher R.

AU - McKay, Neil G.

AU - Yoshida, Masaki

AU - Sellers, Donna J

N1 - © 2010 Wiley-Liss, Inc.

PY - 2010/9

Y1 - 2010/9

N2 - AIMS: 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.METHODS: 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, β(1), β(2) and β(3) selective respectively).RESULTS: 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.CONCLUSIONS: β(3)-adrenoceptors are involved in mediating inhibitory effects of β-adrenoceptor agonists on detrusor contractions via the urothelium in pig bladder dome.

AB - AIMS: 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.METHODS: 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, β(1), β(2) and β(3) selective respectively).RESULTS: 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.CONCLUSIONS: β(3)-adrenoceptors are involved in mediating inhibitory effects of β-adrenoceptor agonists on detrusor contractions via the urothelium in pig bladder dome.

U2 - 10.1002/nau.20838

DO - 10.1002/nau.20838

M3 - Article

VL - 29

SP - 1320

EP - 1325

JO - Neurourology and Urodynamics

JF - Neurourology and Urodynamics

SN - 0733-2467

IS - 7

ER -