Contractile responses of the rat vas deferens after epithelium removal

Contractile responses of the rat vas deferens after epithelium removal

Autor Okpalaugo, E. O. Google Scholar
Garcez-do-Carmo, L. Google Scholar
Jurkiewicz, N. H. Google Scholar
Jurkiewicz, A. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo The purpose of the present investigation was to verify the role of the epithelium in the functional response of the rat vas deferens. Our results showed that the contractile effect of cumulative doses of clonidine (3.10(-5) -3.10(-3)) was increased after the removal of the epithelium. the effect of clonidine in epithelium-free vas deferens returned to normal values when an isolated epithelium from another vas deferens was added to the organ bath, showing that the epithelium is responsible for this increase of maximum effect for clonidine. Drugs functionally or structurally related to clonidine, such as oxymetazoline, alpha-methylnorepinephrine and moxonidine, did not have their dose-response curves altered. the curves for other contractile agents, such as noradrenaline, acetylcholine, ATP, 5HT, bradykinin and histamine, or the relaxation induced by isoprenaline and forskolin were also not modified. Electrically-induced contractions at frequencies from 0.1 to 20 Hz and the mechanism of negative feed-back, brought about by clonidine (10(-10)-10(-8) M) through pre-synaptic alpha(2)-adrenoceptors, were not changed after the removal of epithelium. in conclusion, a significant function of the epithelium in the contractility of the rat vas deferens was demonstrated for clonidine, but not for other agonists. (C) 2002 Elsevier Science Inc. All rights reserved.
Palavra-chave epithelium
rat vas deferens
clonidine
Idioma Inglês
Data de publicação 2002-05-03
Publicado em Life Sciences. Oxford: Pergamon-Elsevier B.V., v. 70, n. 24, p. 2943-2951, 2002.
ISSN 0024-3205 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 2943-2951
Fonte http://dx.doi.org/10.1016/S0024-3205(02)01545-X
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000176374800008
Endereço permanente http://repositorio.unifesp.br/handle/11600/26869

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