Water deprivation and the double- depletion hypothesis: common neural mechanisms underlie thirst and salt appetite
Braz. j. med. biol. res
; 40(5): 707-712, May 2007. tab, graf
Article
em En
| LILACS
| ID: lil-449092
Biblioteca responsável:
BR1.1
ABSTRACT
Water deprivation-induced thirst is explained by the double-depletion hypothesis, which predicts that dehydration of the two major body fluid compartments, the extracellular and intracellular compartments, activates signals that combine centrally to induce water intake. However, sodium appetite is also elicited by water deprivation. In this brief review, we stress the importance of the water-depletion and partial extracellular fluid-repletion protocol which permits the distinction between sodium appetite and thirst. Consistent enhancement or a de novo production of sodium intake induced by deactivation of inhibitory nuclei (e.g., lateral parabrachial nucleus) or hormones (oxytocin, atrial natriuretic peptide), in water-deprived, extracellular-dehydrated or, contrary to tradition, intracellular-dehydrated rats, suggests that sodium appetite and thirst share more mechanisms than previously thought. Water deprivation has physiological and health effects in humans that might be related to the salt craving shown by our species.
Texto completo:
1
Índice:
LILACS
Assunto principal:
Apetite
/
Sede
/
Privação de Água
/
Comportamento de Ingestão de Líquido
/
Homeostase
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Braz. j. med. biol. res
Assunto da revista:
BIOLOGIA
/
MEDICINA
Ano de publicação:
2007
Tipo de documento:
Article