Potentiation of Luteinizing Hormone Release by Estradiol at the Level of the Pituitary
作者:
G.H. Greeley, jr.,
M.B. Allen, jr.,
Virendra B. Mahesh,
期刊:
Neuroendocrinology
(Karger Available online 1975)
卷期:
Volume 18,
issue 3
页码: 233-241
ISSN:0028-3835
年代: 1975
DOI:10.1159/000122402
出版商: S. Karger AG
关键词: Estradiol;Progesteron;FSH;LH;LH-RH;Pituitary
数据来源: Karger
摘要:
The objective of this study was to determine the influence of estradiol-17β and/or progesterone on gonadotropin secretion at the level of the pituitary. Female rats in which the hypothalamo-hypophyseal connections had been permanently interrupted after castration served as the experimental model in which the effect of estradiol and/or progesterone on LH-RH-induced gonadotropin release was examined. In our experimental animals, LH secretion was readily activated by LH-RH administration. LH release was greatly augmented by the prior administration of estradiol benzoate (1 µg/kg b.w./day). Progesterone (5 mg/day) in the absence of estradiol did not modify the 10-min response to LH-RH but reduced the enhancement of LH secretion caused by estradiol pretreatment. Our findings suggest that estradiol potentiated the releasing effect of LH-RH at the level of the gonadotroph, whereas progesterone interfered with the potentiation effect. Plasma levels of FSH were not significantly elevated above the basal value by the administration of LH-RH alone, or in combination with estradiol and/or progesteron
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