Korean J Obstet Gynecol.  1998 Aug;41(8):2174-2180.

Effects of GnRH on FSH Release and Subunit Synthesis in Cultured Rat Anterior Pituitary Cells

Abstract

Follicle stimulating hormine (FSH) is a one of the pituitary gonadotropins that plays an important role in the regulation of gametogenesis and estrogen biosynthesis. It consists of alpha and beta subunit, which are encoded by separate genes. Pituitary release of FSH appears to be regulated by the hypothalamic GnRH and the gonadal steroid hormones. In addition, inhibin and follistatin produced by the gonad have been known to selectively inhibit FSH secretion. However, little is known about their regulation of FSH subunit synthesis at transcriptional and posttranscriptional levels. It has been shown that in vivo paradigms such as ovariectomy and ovarian steroid replacement, levels of FSH generally reflect the transcriptional activity of subunit genes, and ovarian steroids negatively regulate FSH synthesis at the pretranslational level by influencing the steady state levels of FSH alpha and beta subunit mRNA. The present study was, therefore, attempted to determine whether GnRH regulates FSHbeta subunit synthesis in the similar manner to LH at the transcriptional level by using primary pituitary cell culture. The results showed that GnRH stimulated FSHbeta release from cultured pituitary cells in a dose-dependent manner as well as time-dependent manner. The treatment of pituitary cells with GnRH tended to increase FSHbeta subunit mRNA level but increases were not statistically significant suggesting that, unlike LH, GnRH does not seem to play a major role in FSH synthesis by influencing the steady state mRNA level of FSHbeta subunit. From these results, it is, therefore, concluded that GnRH does not seem to be a major regulator for FSH synthesis.

Keyword

GnRH; FSH release; FSHbeta subunit; rat anterior pituitary cells

MeSH Terms

Animals
Cell Culture Techniques
Estrogens
Female
Follistatin
Gametogenesis
Glycoprotein Hormones, alpha Subunit
Gonadal Steroid Hormones
Gonadotropin-Releasing Hormone*
Gonadotropins, Pituitary
Gonads
Inhibins
Ovariectomy
Rats*
RNA, Messenger
Steroids
Estrogens
Follistatin
Glycoprotein Hormones, alpha Subunit
Gonadal Steroid Hormones
Gonadotropin-Releasing Hormone
Gonadotropins, Pituitary
Inhibins
RNA, Messenger
Steroids
Full Text Links
  • KJOG
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2024 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr