[LHRH and LH release in the red fox Vulpes vulpes L]. / LHRH et libération de LH chez le Renard roux Vulpes vulpes L.
C R Acad Sci III
; 303(13): 569-74, 1986.
Article
de Fr
| MEDLINE
| ID: mdl-3096514
ABSTRACT
Pituitary responsiveness to exogenous LHRH was studied in vivo and in vitro in the female red fox, a mono-oestrous species. In vivo, the ability of the pituitary to release LH in response to a single injection of LHRH (2 micrograms/kg) was determined at various stages of the reproductive cycle. The greatest responsiveness is observed during the preovulatory period, the lowest during the luteal phase. During the anoestrus phase, the responsiveness is reduced by more than 50% in lactating females compared to non lactating females. In vitro, dispersed fox anterior pituitary cells were exposed four times to LHRH (10(-9) M), hourly, for 8 min. Pituitary cells were taken from lactating and non lactating females. The cells are not sensitive to LHRH in lactating females but become more and more sensitive after weaning. It is suggested the inhibitory influence of lactation could be the result of prolactin-ovarian steroids-gonadotrophins interactions.
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Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Hormone lutéinisante
/
Hormone de libération des gonadotrophines
/
Renards
Limites:
Animals
Langue:
Fr
Journal:
C R Acad Sci III
Sujet du journal:
BIOLOGIA
Année:
1986
Type de document:
Article