Back to Search
Start Over
Functional investigation of β-adrenoceptors in human isolated detrusor focusing on the novel selective β3-adrenoceptor agonist KUC-7322.
- Source :
-
Naunyn-Schmiedeberg's archives of pharmacology [Naunyn Schmiedebergs Arch Pharmacol] 2012 Aug; Vol. 385 (8), pp. 759-67. Date of Electronic Publication: 2012 May 29. - Publication Year :
- 2012
-
Abstract
- This study aimed to characterize the β-adrenoceptor (β-AR) subtype mediating relaxation of isolated human bladder strips and to explore relaxation by the novel β3-AR-selective agonist KUC-7322 for its relaxant effect on the human isolated detrusor and for its effect on the carbachol (CCh)-induced contractile response. In two parallel studies, relaxation of isolated human bladder strips was tested for the β-AR agonists isoproterenol, clenbuterol, BRL 37344, and KUC-7322. For the isoproterenol and KUC-7322 responses, antagonism by CGP 20712A, ICI 118551, and SR59230A was determined. The potency and efficacy of the reference agonists for detrusor relaxation was in line with their known β3-AR activity. KUC-7322 relative to isoproterenol was a full agonist with a pEC(50) of 5.95 ± 0.09 and 5.92 ± 0.11 in the two studies. SR59230A exhibited antagonism of the expected potency against isoproterenol (apparent pK (B) 7.2) but not against KUC-7322. Neither isoproterenol nor KUC-7322 nor forskolin significantly attenuated CCh-induced contraction. These results suggest that KUC-7322 displays full agonistic activity in relaxing the human detrusor without inhibiting the contraction induced by cholinergic stimulation. These characteristics, if proven in vivo, may be beneficial for the treatment of overactive bladder, as increased bladder capacity with a negligible effect on voiding contractions may be anticipated.
- Subjects :
- Adrenergic beta-Agonists pharmacology
Adrenergic beta-Antagonists pharmacology
Aged
Carbachol pharmacology
Data Interpretation, Statistical
Dose-Response Relationship, Drug
Female
Humans
Male
Muscarinic Agonists pharmacology
Muscarinic Antagonists pharmacology
Muscle Contraction drug effects
Muscle Relaxation drug effects
Parasympatholytics pharmacology
Receptors, Adrenergic, beta drug effects
Urinary Bladder Neoplasms surgery
p-Hydroxyamphetamine pharmacology
Acetates pharmacology
Adrenergic beta-3 Receptor Agonists pharmacology
Receptors, Adrenergic, beta physiology
Urinary Bladder drug effects
p-Hydroxyamphetamine analogs & derivatives
Subjects
Details
- Language :
- English
- ISSN :
- 1432-1912
- Volume :
- 385
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Naunyn-Schmiedeberg's archives of pharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 22644105
- Full Text :
- https://doi.org/10.1007/s00210-012-0763-x