[LH and prolactin secretion under constant light in estrogen treated rats (author's transl)].
Plasma LH and prolactin levels were studied in ovariectomized adult female rats submitted to light-darkness (L:D) or constant light (L:L) schedules, after the administration of estradiol benzoate (EB), 75 micrograms/day for six consecutive days. Previous to the treatment with EB LH levels were lower and prolactin levels higher in the L:L females. On days 1 and 2 after treatment, L:D females showed circadian variations of LH levels, these being higher at 17 h than at 10 h. This pattern disappeared in the L:D females. Prolactin levels increased similarly in both groups. Nine days after treatment, plasma prolactin levels remained high and the circadian pattern of LH in the L:D group disappeared.
D000818:Animals; D002369:Castration; D002940:Circadian Rhythm; D003624:Darkness; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D008027:Light; D007986:Luteinizing Hormone / Q000378:metabolism*; D010053:Ovary / Q000502:physiology* / Q000601:surgery; D010775:Photic Stimulation; D011388:Prolactin / Q000378:metabolism*; D051381:Rats; D013268:Stimulation, Chemical
D004958:Estradiol; D011388:Prolactin; D007986:Luteinizing Hormone
Secreción de LH y prolactina en ratas tratadas con estrógenos y sometidas a luz constante.