Comparison of muscarinic receptor selectivity of solifenacin and oxybutynin in the bladder and submandibular gland of muscarinic receptor knockout mice.
Article Details
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Ito Y, Oyunzul L, Yoshida A, Fujino T, Noguchi Y, Yuyama H, Ohtake A, Suzuki M, Sasamata M, Matsui M, Yamada S
Comparison of muscarinic receptor selectivity of solifenacin and oxybutynin in the bladder and submandibular gland of muscarinic receptor knockout mice.
Eur J Pharmacol. 2009 Aug 1;615(1-3):201-6. doi: 10.1016/j.ejphar.2009.04.068. Epub 2009 May 13.
- PubMed ID
- 19446545 [ View in PubMed]
- Abstract
Solifenacin is a novel selective antagonist of M(3) muscarinic receptor developed for the treatment of overactive bladder. The current study was undertaken to characterize in vivo muscarinic receptor subtype selectivity of solifenacin in the bladder and submandibular gland by using muscarinic receptor subtype knockout (KO) mice. Muscarinic receptors in the bladder and submandibular gland of wild type, M(2)R KO and M(3)R KO mice under in vitro and after oral administration of solifenacin and oxybutynin were measured by radioligand binding assay using [N-methyl-(3)H]scopolamine ([(3)H]NMS). There was little difference between the bladder and submandibular gland of M(2)R KO mice in the receptor binding activities of oxybutynin and solifenacin in vitro, suggesting equal affinity for residual (predominantly M(3) subtype) muscarinic receptors in both tissues. In contrast, compared with oral oxybutynin, oral administration of solifenacin exerted a significantly greater activity to bind muscarinic receptors in the bladder of M(2)R KO mice, while exhibiting a significantly less activity to bind those in the submandibular gland. In the bladder and submandibular gland of M(3)R KO mice, the binding activity of solifenacin and oxybutynin showed no significant difference. Plasma concentrations of solifenacin and oxybutynin after oral administration differed little among wild type, M(2)R KO and M(3)R KO mice. The results indicate that oral solifenacin, unlike oral oxybutynin, may selectively bind to the muscarinic M(3) subtype in the bladder compared with such receptors in the submandibular gland in vivo. Oral solifenacin may be advantageous for the treatment of overactive bladder, in terms of high affinity for M(3) receptors in the bladder.
DrugBank Data that Cites this Article
- Drug Targets
Drug Target Kind Organism Pharmacological Action Actions Oxybutynin Muscarinic acetylcholine receptor M2 Protein Humans YesAntagonistDetails Oxybutynin Muscarinic acetylcholine receptor M3 Protein Humans YesAntagonistDetails Solifenacin Muscarinic acetylcholine receptor M3 Protein Humans YesAntagonistDetails