Regulation of the preovulatory gonadotropin surge by endogenous steroids

Virendra B. Mahesh, Darrell W. Brann

Research output: Contribution to journalReview article

72 Scopus citations

Abstract

Estradiol secreted by growing ovarian follicle(s) has been considered classically to be the neural trigger for the preovulatory surge of gonadotropins. The observation that the estradiol-induced gonadotropin surge in ovariectomized rats is of lesser magnitude and duration than that found in the cycling rat at proestrus has resulted in a search for other steroid regulators. Progesterone is a major regulator of the preovulatory gonadotropin surge. It can only act in the presence of an estrogen background, which is necessary for the synthesis of progesterone receptors. In the estrogen-primed ovariectomized rat, progesterone is able to initiate and enhance the gonadotropin surge to the magnitude observed on the day of proestrus and limit it to 1 day. The physiological role of progesterone in the induction of the preovulatory gonadotropin surge has been demonstrated by the attenuation of the progesterone-induced surge and the endogenous proestrus surge by progesterone receptor antagonist RU486 and the progesterone synthesis inhibitor trilostane. The promoter region of the follicle-stimulating hormone (FSH)-β gene contains multiple progesterone response elements and progesterone brings about FSH release as well. The reduction of progesterone in the 5α-position appears to be important for the regulation of progesterone secretion. Corticosteroids appear to play a significant role in the secondary FSH surge on late proestrus and early estrus.

Original languageEnglish (US)
Pages (from-to)616-629
Number of pages14
JournalSteroids
Volume63
Issue number12
DOIs
StatePublished - Dec 1 1998

Keywords

  • FSH
  • GnRH
  • Gonadotropin surge
  • Hypothalamus
  • LH
  • Pituitary
  • Steroid

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology
  • Pharmacology
  • Clinical Biochemistry
  • Organic Chemistry

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