Format

Send to

Choose Destination
J Pharmacol Exp Ther. 2016 Jan;356(1):116-22. doi: 10.1124/jpet.115.228882. Epub 2015 Nov 3.

A1 Adenosine Receptor-Mediated Inhibition of Parasympathetic Neuromuscular Transmission in Human and Murine Urinary Bladder.

Author information

1
Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, Illinois (T.J.S., E.M.S.); and Division of Urology, Southern Illinois University School of Medicine, Springfield, Illinois (D.I.D., S.R.A., A.M.E.-Z., K.T.M.) tjs026@northwestern.edu.
2
Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, Illinois (T.J.S., E.M.S.); and Division of Urology, Southern Illinois University School of Medicine, Springfield, Illinois (D.I.D., S.R.A., A.M.E.-Z., K.T.M.).

Abstract

The potential role of A1 adenosine receptors in modulating neuromuscular transmission in the detrusor muscle of the urinary bladder has been tested in human and murine preparations with the intent to determine the viability of using adenosine receptor agonists as adjuncts to treat overactive bladder. In human detrusor muscle preparations, contractile responses to electrical field stimulation were inhibited by the selective A1 adenosine receptor agonists 2-chloro-N(6)-cyclopentyladenosine, N(6)-cyclopentyladenosine (CPA), and adenosine (rank order of potency: 2-chloro-N(6)-cyclopentyladenosine > CPA > adenosine). Pretreatment with 8-cyclopentyl-3-[3-[[4(fluorosulphonyl)benzoyl]oxy]propyl]-1-propylxanthine, an irreversible A1 antagonist, blocked the effects of CPA, thus confirming the role of A1 receptors in human detrusor preparations. In murine detrusor muscle preparations, contractions evoked by electrical field stimulation were reduced by CPA or adenosine. Amplitudes of the P2X purinoceptor-mediated excitatory junctional potentials (EJPs) recorded with intracellular microelectrodes were reduced in amplitude by CPA and adenosine with no effect on the spontaneous EJP amplitudes, confirming the prejunctional action of these agents. 8-Cyclopentyltheophylline, a selective A1 receptor antagonist, reversed the effects of CPA on EJP amplitudes with no effect of spontaneous EJPs, confirming the role of A1 receptors in mediating these effects.

PMID:
26534943
PMCID:
PMC4702072
DOI:
10.1124/jpet.115.228882
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for HighWire Icon for PubMed Central
Loading ...
Support Center