Involvement of vasopressin and corticotropin-releasing hormone in VIP- and PHI-induced secretion of ACTH and corticosterone.
Neuropeptides
; 28(3): 167-73, 1995 Mar.
Article
en En
| MEDLINE
| ID: mdl-7791960
The relative roles of hypothalamic corticotropin-releasing-hormone (CRH) and vasopressin (AVP) as mediators of the stimulant effect of vasoactive intestinal peptide (VIP) and peptide histidine isoleucine (PHI) on ACTH and corticosterone (CORT) secretion, were examined using receptor blockade of endogenous CRH and AVP. ACTH and CORT secretion were stimulated 6- and 7-fold, respectively, by PVN infusion of VIP (3.0 nmol) and 6- and 9-fold, respectively, by PHI (3.0 nmol). ACTH and CORT stimulation by VIP were inhibited 78 and 72%, respectively, by pretreatment with the CRF antagonist, 59 and 57%, respectively, by pretreatment with the AVP antagonist and about 78% by combined pretreatment with the CRF and AVP antagonists. PHI-induced stimulation of ACTH and CORT was inhibited 89 and 81%, 73 and 59% and 93% by pretreatment with the CRF- or AVP-antagonist or combined administration, respectively. These results support the hypothesis that the activation of the hypothalamic-pituitary-adrenal (HPA) axis by VIP and PHI is mediated through the release of endogenous CRH. AVP also plays a role in this response, possibly by enhancing the activity of CRH in a synergistic manner.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sistema Hipófiso-Suprarrenal
/
Péptido PHI
/
Arginina Vasopresina
/
Corticosterona
/
Hormona Liberadora de Corticotropina
/
Péptido Intestinal Vasoactivo
/
Hormona Adrenocorticotrópica
/
Sistema Hipotálamo-Hipofisario
Límite:
Animals
Idioma:
En
Revista:
Neuropeptides
Año:
1995
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Países Bajos