Titre : | The effect of anandamide on prolactin secretion is modulated by estrogen |
Titre traduit : | (L'effet de l'anadamide sur la sécretion de prolactine sont modulés par les oestrogènes.) |
Auteurs : | SCORTICATI C. ; MOHN C. ; DE LAURENTIIS A. ; VISSIO P. ; J. FERNANDEZ SOLARI ; A. SEILICOVICH ; McCANN S. M. ; RETTORI V. |
Type de document : | Périodique |
Année de publication : | 2003 |
Format : | 2134-2139 / graph. ; ill. |
Note générale : |
Proceedings of the National Academy of Sciences, 2003, 100, (4), 2134-2139 ; graph. ; ill.
|
Langues: | Anglais |
Discipline : | PRO (Produits, mode d'action, méthode de dépistage / Substances, action mode, screening methods) |
Mots-clés : |
Thésaurus mots-clés TETRAHYDROCANNABINOL ; RECEPTEUR ; NEUROTRANSMETTEURS ; HORMONES ; MECANISME D'ACTION ; MODELE ANIMAL |
Résumé : | Recent research has revealed that endogenous cannabinoid receptors (CB1 and CB2) react with the alive ingredient of marijuana, delta9-tetrahydrocannabinol. Two endogenous ligands activate these reteptors. The principal one, anandamide (AEA), activates CB1. AEA and CB1 are localized to various neurons within the brain. Because delta9-tetrahydrocannabinol inhibited prolactin (Prl) secretion following its intraventricular injection into male rats, we hypothesized that AEA would have a similar effect. Estrogen modifies many hormonal responses and is known to increase Prl secretion. Therefore, we hypothesized that responses to intraventricular AEA would change depending on the gonadal steroid environment. Consequently, we evaluated the effects of lateral cerebral ventricular microinjection of AEA (20 ng) into male, ovariectomized (OVX), and estrogen-primed (OVX-E) rats. AEA decreased plasma Prl in male rats, had little effect in OVX females, and increased Prl in OVX-E rats. The results were at least partially mediated by changes in dopaminergic turnover, altering the inhibitory dopaminergic control of Prl release by the anterior pituitary gland. Thus, dopamine turnover was increased in the male rats and decreased significantly in OVX and in OVX-E rats. The changes in Prl may be caused not only by altered dopamine input to the anterior pituitary gland but also by effects of AEA on other transmitters known to alter Prl release. Importantly, in OVX-E rats, the elevated Prl release and the response to AEA were blocked by the AEA antagonist, indicating that AEA is a synaptic transmitter released from neurons that decrease inhibitory control of Prl release. (Author' s abstract) |
Domaine : | Drogues illicites / Illicit drugs |
Refs biblio. : | 26 |
Affiliation : |
Centro de Estudios Farmacologicos y Botanicos, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Serrano 669, 1414 Buenos Aires. Argentine. Argentina. |
Numéro Toxibase : | 206986 |
Centre Emetteur : | 02 Coordonnateur |
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