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Type: Artigo de periódico
Title: Evaluation Of The Relaxant Effect Of The Nitric Oxide-independent Soluble Guanylyl Cyclase Stimulator Bay 41-2272 In Isolated Detrusor Smooth Muscle.
Author: Báu, Fernando R
Mónica, Fabiola Z T
Priviero, Fernanda B M
Baldissera, Lineu
de Nucci, Gilberto
Antunes, Edson
Abstract: The nitric oxide (NO)-independent soluble guanylyl cyclase stimulator stimulator BAY 41-2272 was reported to produce relaxant response in different types of smooth muscle. However no study was carried out to investigate the effects of BAY 412282 in detrusor smooth muscle. Thus, this study aimed to evaluate the relaxant effects of BAY 41-2272, in isolated mouse, rat and rabbit detrusor smooth muscle. Mouse, rat and rabbit were anesthetized, and urinary bladder removed. Detrusor smooth muscle was transferred to 10-mL organ baths containing oxygenated and warmed Krebs-Henseleit solution. Tissues were connected to force-displacement transducers and changes in isometric force were recorded. BAY 41-2272 (0.001-100 microM) produced concentration-dependent detrusor smooth muscle relaxations in mouse, rat and rabbit with maximal responses of 61.3+/-6.6%, 95.1+/-9.9% and 91.7+/-5.9%, respectively. Sodium nitroprusside and glyceryl trinitrate, as well as 8-bromo-cGMP also produced detrusor relaxations, but to a much lesser extent than BAY 41-2272. The NO synthesis inhibitor L-NAME and the phosphodiesterase-5 inhibitor sildenafil had no effect in BAY 41-2272-induced responses. However, the soluble guanylyl cyclase inhibitor ODQ significantly reduced BAY 41-2272-induced relaxations. BAY 41-2272 increased the bladder cGMP levels by about of 14- and 20-fold for 10 and 100 microM, respectively, which were markedly reduced by ODQ. The cAMP levels were unaffected by BAY 41-2272. Moreover, BAY 41-2272 significantly reduced the contractile responses to extracellular Ca(2+) in an ODQ-insensitive manner. In conclusion, rabbit detrusor smooth muscle relaxations by BAY 41-2272 involve mainly cGMP production, but an additional mechanism involving Ca(2+) influx blockade independently of cGMP production appears to be involved.
Subject: Animals
Calcium Channels
Cyclic Gmp
Dose-response Relationship, Drug
Enzyme Activation
Enzyme Activators
Guanylate Cyclase
Mice, Inbred C57bl
Muscle Relaxation
Muscle, Smooth
Nitric Oxide
Potassium Channels
Rats, Wistar
Receptors, Cytoplasmic And Nuclear
Citation: European Journal Of Pharmacology. v. 637, n. 1-3, p. 171-7, 2010-Jul.
Rights: fechado
Identifier DOI: 10.1016/j.ejphar.2010.04.008
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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