Involvement of K+ channels in the relaxant responses to various agonists in estrogen primed rat uterus.
Indian J Physiol Pharmacol
;
1995 Apr; 39(2): 140-4
Artigo
em Inglês
| IMSEAR
| ID: sea-107677
ABSTRACT
The present investigation was undertaken to study the effects of K+ channel openers in the relaxant responses to various agonists in estrogen primed rat uterus. Adrenaline and isoprenaline produced a dose-dependent relaxation in the estrogen primed rat uterus. The relaxant responses were found to be significantly potentiated when the preparations were exposed to PSS devoid of calcium. The responses to isoprenaline were found to be greater in the preparations depolarized with 40 mM KCl instead of 80 mM KCl. KCl failed to produce any contractile effect in the presence of D-600. Further, the addition of D-600 completely relaxed the KCl depolarized rat uterus. Pinacidil and cromakalim failed to relax 80 mM KCl depolarized rat uterus. However, they produced dose-dependent relaxation in the preparations depolarized with 40 mM KCl. The relaxant responses to pinacidil and cromakalim were competitively blocked by procaine. However, they were not altered by either propranolol or cimetidine. The relaxant responses to isoprenaline and histamine were found to be potentiated by pinacidil and cromakalim. These results indicate that in rat uterus in addition to adenylate cyclase c-AMP, potassium channels are also involved in the relaxant responses to isoprenaline and histamine.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Cloreto de Potássio
/
Pirróis
/
Ratos
/
Contração Uterina
/
Útero
/
Vasodilatadores
/
Benzopiranos
/
Feminino
/
Canais de Potássio
/
Epinefrina
Idioma:
Inglês
Revista:
Indian J Physiol Pharmacol
Ano de publicação:
1995
Tipo de documento:
Artigo
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