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The bi-modal effects of estradiol on gonadotropin synthesis and secretion in female mice are dependent on estrogen receptor-alpha.

Publication ,  Journal Article
Lindzey, J; Jayes, FL; Yates, MM; Couse, JF; Korach, KS
Published in: J Endocrinol
October 2006

Depending on the estrous/menstrual cycle stage in females, ovarian-derived estradiol (E(2)) exerts either a negative or a positive effect on the hypothalamic-pituitary axis to regulate the synthesis and secretion of pituitary gonadotropins, LH, and FSH. To study the role of estrogen receptor-alpha (ERalpha) mediating these effects, we assessed the relevant parameters in adult wild-type (WT) and ERalpha-null (alphaERKO) female mice in vivo and in primary pituitary cell cultures. The alphaERKO mice exhibited significantly higher plasma and pituitary LH levels relative to WT females despite possessing markedly high levels of circulating E(2). In contrast, hypothalamic GnRH content and circulating FSH levels were comparable between genotypes. Ovariectomy led to increased plasma LH in WT females but no further increase in alphaERKO females, while plasma FSH levels increased in both genotypes. E(2) treatment suppressed the high plasma LH and pituitary Lhb mRNA expression in ovariectomized WT females but had no effect in alphaERKO. In contrast, E(2) treatments only partially suppressed plasma FSH in ovariectomized WT females, but this too was lacking in alphaERKO females. Therefore, negative feedback on FSH is partially E(2)/ERalpha mediated but more dependent on ovarian-derived inhibin, which was increased threefold above normal in alphaERKO females. Together, these data indicate that E(2)-mediated negative feedback is dependent on functional ERalpha and acts to primarily regulate LH synthesis and secretion. Studies in primary cultures of pituitary cells from WT females revealed that E(2) did not suppress basal or GnRH-induced LH secretion but instead enhanced the latter response, indicating that the positive influence of E(2) on gonadotropin secretion may occur at the level of the pituitary. Once again this effect was lacking in alphaERKO gonadotropes in culture. These data indicate that the aspects of negative and positive effects of E(2) on gonadotropin secretion are ERalpha dependent and occur at the level of the hypothalamus and pituitary respectively.

Duke Scholars

Published In

J Endocrinol

DOI

ISSN

0022-0795

Publication Date

October 2006

Volume

191

Issue

1

Start / End Page

309 / 317

Location

England

Related Subject Headings

  • Reverse Transcriptase Polymerase Chain Reaction
  • Pituitary Gland
  • Ovariectomy
  • Mice, Knockout
  • Mice, Inbred C57BL
  • Mice
  • Luteinizing Hormone, beta Subunit
  • Luteinizing Hormone
  • Hypothalamus
  • Gonadotropins, Pituitary
 

Citation

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MLA
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Lindzey, J., Jayes, F. L., Yates, M. M., Couse, J. F., & Korach, K. S. (2006). The bi-modal effects of estradiol on gonadotropin synthesis and secretion in female mice are dependent on estrogen receptor-alpha. J Endocrinol, 191(1), 309–317. https://doi.org/10.1677/joe.1.06965
Lindzey, Jonathan, Friederike L. Jayes, Mariana M. Yates, John F. Couse, and Kenneth S. Korach. “The bi-modal effects of estradiol on gonadotropin synthesis and secretion in female mice are dependent on estrogen receptor-alpha.J Endocrinol 191, no. 1 (October 2006): 309–17. https://doi.org/10.1677/joe.1.06965.
Lindzey J, Jayes FL, Yates MM, Couse JF, Korach KS. The bi-modal effects of estradiol on gonadotropin synthesis and secretion in female mice are dependent on estrogen receptor-alpha. J Endocrinol. 2006 Oct;191(1):309–17.
Lindzey, Jonathan, et al. “The bi-modal effects of estradiol on gonadotropin synthesis and secretion in female mice are dependent on estrogen receptor-alpha.J Endocrinol, vol. 191, no. 1, Oct. 2006, pp. 309–17. Pubmed, doi:10.1677/joe.1.06965.
Lindzey J, Jayes FL, Yates MM, Couse JF, Korach KS. The bi-modal effects of estradiol on gonadotropin synthesis and secretion in female mice are dependent on estrogen receptor-alpha. J Endocrinol. 2006 Oct;191(1):309–317.
Journal cover image

Published In

J Endocrinol

DOI

ISSN

0022-0795

Publication Date

October 2006

Volume

191

Issue

1

Start / End Page

309 / 317

Location

England

Related Subject Headings

  • Reverse Transcriptase Polymerase Chain Reaction
  • Pituitary Gland
  • Ovariectomy
  • Mice, Knockout
  • Mice, Inbred C57BL
  • Mice
  • Luteinizing Hormone, beta Subunit
  • Luteinizing Hormone
  • Hypothalamus
  • Gonadotropins, Pituitary