Effects of the beta 3-adrenergic receptor agonist disodium 5-[(2R)-2-[[(2R)-2-(3-chlorophenyl)-2-hydroxyethyl]amino]propyl]-1,3-benzodioxole-2,2-dicarboxylate (CL-316243) on bladder micturition reflex in spontaneously hypertensive rats

The Journal of Pharmacology and Experimental Therapeutics
Lisa A LeonXin Su

Abstract

The present study investigated whether beta3-adrenoceptor activation acts on the bladder afferent pathway by examination of the visceromotor reflex (VMR) and pressor responses to urinary bladder distension (UBD) and whether beta3-adrenoceptor activation produces urinary bladder relaxation in hyperactive spontaneously hypertensive rats (SHRs) in comparison with their normotensive control rats [Wistar-Kyoto (WKY)]. Using the VMR responses to noxious UBD as a measure of bladder afferent signal transmission, SHRs did not present a sensitized bladder phenotype. However, reduced bladder compliance accompanied by a reduced void threshold was detected in the SHR detrusor. Furthermore, the selective beta3-adrenoceptor agonist disodium 5-[(2R)-2-[[(2R)-2-(3-chlorophenyl)-2-hydroxyethyl]-amino]propyl]-1,3-benzodioxole-2,2-dicarboxylate (CL-316243) (i.v.) failed to attenuate VMR or pressor responses to UBD in either SHRs or WKY rats, but it dose-dependently inhibited rhythmic contraction (RC) in SHRs. The minimal effective dose was 0.001 mg/kg. Using the same model in WKY rats, CL-316243 did not elicit significant inhibition of contractions in the bladder RC assay. These results suggest that SHRs represent abnormal efferent/detrusor functi...Continue Reading

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