On the Site and Mechanism of Action of β3-Adrenoceptor Agonists in the Bladder.

Abstract:

:The clinical success of mirabegron as the first β3-adrenoceptor (AR) agonist for treatment of the overactive bladder (OAB) syndrome, has resulted in substantial interest in its site and mechanism of action. Even if the adrenergic innervation of the bladder and urethra has been well studied, the location(s) of β3-ARs in different structures within the bladder wall and urethra, and the mode(s) of action of β3-AR stimulation have still not been established. The recent demonstration of β3-ARs on cholinergic nerve terminals with no immunoreactivity in urothelium or detrusor smooth muscle, is not in agreement with previous morphological studies, and functional data strongly suggest that β3-ARs can be found these structures. However, recent studies suggest that the β3-ARs on detrusor smooth muscle may not be the functionally most relevant. The assumption that β3-AR activation during bladder filling inhibits acetylcholine release from parasympathetic neurons by a prejunctional mechanism and that this decreases bladder micromotions that generate afferent activity, is an attractive hypothesis. It does not exclude that other mechanisms may be contributing, and supports combined approaches to reduce afferent activity for treatment of the OAB syndrome.

journal_name

Int Neurourol J

authors

Andersson KE

doi

10.5213/inj.1734850.425

subject

Has Abstract

pub_date

2017-03-24 00:00:00

pages

6-11

issue

1

eissn

2093-4777

issn

2093-6931

pii

inj-1734850-425

journal_volume

21

pub_type

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