Central moxonidine on water and NaCl intake
Carregando...
Fonte externa
Fonte externa
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Tipo
Artigo
Direito de acesso
Acesso restrito
Fonte externa
Fonte externa
Resumo
In this study we investigated: (a) the effects of intracerebroventricular (i.c.v.) injections of moxonidine (an alpha(2)-adrenergic and imidazoline receptor agonist) on the ingestion of water and NaCl induced by 24 h of water deprivation; (b) the effects of i.c.v. injection of moxonidine on central angiotensin II (ANG II)- and carbachol-induced water intake; (c) the effects of the pre-treatment with i.c.v, idazoxan (an alpha(2)-adrenergic and imidazoline receptor antagonist) and RX 821002 (a selective alpha(2)-adrenergic antagonist) on the antidipsogenic action of central moxonidine. Male Holtzman rats had stainless steel cannulas implanted in the lateral cerebral ventricle. Intracerebroventricular injection of moxonidine (5 and 20 nmol/1 mu l) reduced the ingestion of 1.5% NaCl solution (4.1 +/- 1.1 and 2.9 +/- 2.5 ml/2 h, respectively vs. control = 7.4 +/- 2.1 ml/2 h) and water intake (2.0 +/- 0.6 and 0.3 +/- 0.2 ml/h, respectively vs. control = 13.0 +/- 1.4 ml/h) induced by water deprivation, Intracerebroventricular moxonidine (5 nmol/1 mu l) also reduced i.c.v. ANG Ii-induced water intake (2.8 +/- 0.9 vs. control = 7.9 +/- 1.7 ml/1 h) and i.c.v. moxonidine (10 and 20 nmol/1 mu l) reduced i.c.v. carbachol-induced water intake (4.3 +/- 1.7 and 2.1 +/- 0.9, respectively vs. control = 9.2 +/- 1.0 ml/1 h). The pre-treatment with i.c.v. idazoxan (40 to 320 nmol/1 mu l) abolished the inhibitory effect of i.c.v, moxonidine on carbachol-induced water intake. Intracerebroventricular idazoxan (320 nmol/1 mu l) partially reduced the inhibitory effect of moxonidine on water deprivation-induced water intake and produced only a tendency to reduce the antidipsogenic effect of moxonidine on ANG Ii-induced water intake. RX 821002 (80 and 160 nmol/1 mu l) completely abolished the antidipsogenic action of moxonidine on ANG Ii-induced water intake. The results show that central injections c: moxonidine strongly inhibit water and NaCl ingestion. They also suggest the involvement of central alpha(2)-adrenergic receptors in the antidipsogenic action of moxonidine. (C) 1999 Elsevier B.V.
Descrição
Palavras-chave
salt appetite, thirst, angiotensin, water deprivation, alpha(2) adrenergic receptors, imidazoline receptors
Idioma
Inglês
Citação
Brain Research Bulletin. Oxford: Pergamon-Elsevier B.V., v. 49, n. 4, p. 273-279, 1999.
