Enhanced effect of neuropeptide Y on food intake caused by blockade of the V(1A) vasopressin receptor.
Eur J Pharmacol
; 622(1-3): 32-6, 2009 Nov 10.
Article
em En
| MEDLINE
| ID: mdl-19766110
ABSTRACT
Food intake is regulated by various factors such as neuropeptide Y. Neuropeptide Y potently induces an increase in food intake, and simultaneously stimulates arginine-vasopressin (AVP) secretion in the brain. Recently, we reported that V(1A) vasopressin receptor-deficient (V(1A)R(-/-)) mice exhibited altered daily food intake accompanied with hyperglycemia and hyperleptinemia. Here, we further study the involvement of the AVP/V(1A) receptor in the appetite regulation of neuropeptide Y with V(1A)R(-/-) mice and antagonists for the AVP receptor. The intra-cerebral-ventricle administration of neuropeptide Y induced greater food consumption in V(1A)R(-/-) mice than wild-type (WT) mice, whereas an anorexigenic effect of leptin was not different between the two groups. This finding suggests that the orexigenic effect of neuropeptide Y was enhanced in V(1A)R(-/-) mice, leading to the increased food intake in response to the neuropeptide Y stimulation. In addition, the neuropeptide Y-induced orexigenic effect was enhanced by co-administration of OPC-21268, an antagonist for the V(1A) vasopressin receptor, into the cerebral ventricle in WT mice, whereas the neuropeptide Y-induced orexigenic effect was not affected by co-administration of SSR-149415, an antagonist for the V(1B) vasopressin receptor. These results indicate that AVP could suppress the neuropeptide Y-induced orexigenic effect via the V(1A) vasopressin receptor, and that blockade or inhibition of the AVP/V(1A) receptor signal resulted in the enhanced neuropeptide Y-induced orexigenic effect. Thus, we show that the AVP/V(1A) receptor is involved in appetite regulation as an anorexigenic factor for the neuropeptide Y-induced orexigenic effect.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Neuropeptídeo Y
/
Ingestão de Alimentos
/
Antagonistas dos Receptores de Hormônios Antidiuréticos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Eur J Pharmacol
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Japão