Skip navigation
Universidade Federal da Bahia |
Repositório Institucional da UFBA
Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/7970
Tipo: Artigo de Periódico
Título: Central administration of zinc increases renal sodium and potassium excretion in rats
Título(s) alternativo(s): Brain Research
Autor(es): Silva, Emilio de Castro e
Luz, Carla P.
Marinho, Carol A.
Castro, Letícia
Sarmento, Clarissa
Gonzalez, Virna
Oliveira, Patrícia
Nascimento, Thais
Santana Jr, Pedro
Lima, Ana K.
Fregoneze, Josmara B.
Autor(es): Silva, Emilio de Castro e
Luz, Carla P.
Marinho, Carol A.
Castro, Letícia
Sarmento, Clarissa
Gonzalez, Virna
Oliveira, Patrícia
Nascimento, Thais
Santana Jr, Pedro
Lima, Ana K.
Fregoneze, Josmara B.
Abstract: The aim of the present study was to investigate the effect of acute third ventricle injections of zinc on the brain control of renal sodium and potassium excretion. Adult Wistar male rats received third ventricle injections of zinc acetate in three different doses (0.03, 0.3 and 3.0 nmol/rat). Third ventricle administration of zinc acetate provoked a significant intensification of natriuresis and kaliuresis as compared to sodium acetate-treated controls. When rats were pretreated with losartan, a selective angiotensin II AT1 receptor antagonist (10.8 nmol/rat into the third ventricle 10 min before central zinc injection) the increase in both natriuresis and kaliuresis was abolished. Furthermore, pretreatment with gadolinium, a calcium channel blocker (0.3 nmol/rat into the third ventricle 20 min before central zinc injection), also blunted the increase in renal sodium and potassium excretion seen in animals receiving zinc alone. In a group of rats receiving the same water load used in the previous experiments, the injection of zinc acetate into the third ventricle (3.0 nmol/rat) did not modify arterial blood pressure. It is suggested that zinc in the central nervous system may be involved in the control of renal sodium and potassium excretion by a mechanism unrelated to blood pressure increase. It is also shown that both natriuretic and kaliuretic actions of zinc depend on AT1 receptor activation. Whatever should be the mechanism(s) related to the central effects of zinc here evidenced, the functional integrity of calcium channels is required.
Palavras-chave: Angiotensin II
Calcium channel
Renal function
Gadolinium
Losartan
Zinc
Blood pressure
URI: http://www.repositorio.ufba.br/ri/handle/ri/7970
Data do documento: 1999
Aparece nas coleções:Artigo Publicado em Periódico (Biologia)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
Silva.pdf
  Restricted Access
251,2 kBAdobe PDFVisualizar/Abrir Solicitar uma cópia
Mostrar registro completo do item Visualizar estatísticas


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.