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Mechanisms involved in the nitric oxide independent inhibitory neurotransmission to the pig urinary bladder neck.
MedLine Citation:
PMID:  20658543     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
AIMS: The current study investigates the mechanisms involved in nitric oxide (NO)-independent, nonadrenergic, noncholinergic (NANC) inhibitory neurotransmission to the pig urinary bladder neck.
METHODS: Urothelium-denuded strips were mounted in organ baths containing physiological saline solution (PSS) at 37°C for isometric force recordings. The relaxations to electrical field stimulation (EFS) were carried out on strips treated with guanethidine, atropine and N(G) -nitro-L-arginine, to block noradrenergic neurotransmission, muscarinic receptors and NO synthase, respectively, and precontracted with phenylephrine.
RESULTS: EFS (1-16 Hz) produced frequency-dependent relaxations which were abolished by the blockade of neuronal voltage-activated Na(+) channels. Nonselective and selective inhibition of COX and COX-1, respectively, and blockade of Na(+) -K(+) ATPase reduced the EFS-induced relaxations. However, blockade of COX-2, soluble guanylyl cyclase, large-, intermediate- and small-conductance Ca(2+) -activated K(+) channels, ATP-dependent K(+) channels, voltage-gated K(+) channels, cAMPc-dependent protein kinase (PKA) and cGMP-dependent protein kinase (PKG) failed to modify the nerve-mediated relaxations.
CONCLUSIONS: The NO-independent inhibitory neurotransmission to the pig urinary bladder neck is mediated, in part, through prostanoids release from a COX-1 pathway, and through activation of the Na(+) -K(+) ATPase. PKA and PKG pathways and postjunctional K(+) channels do not appear to be involved in the NO-independent nerve-mediated relaxations.
Authors:
Ana Martínez-Saénz; María Victoria Barahona; Luis M Orensanz; Paz Recio; Salvador Bustamante; Sara Benedito; Joaquín Carballido; Albino García-Sacristán; Dolores Prieto; Medardo Hernández
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-23
Journal Detail:
Title:  Neurourology and urodynamics     Volume:  30     ISSN:  1520-6777     ISO Abbreviation:  Neurourol. Urodyn.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8303326     Medline TA:  Neurourol Urodyn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  151-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Wiley-Liss, Inc.
Affiliation:
Departamento de Fisiología, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain.
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