Androgen-specific regulation of FSH signalling in the previtellogenic ovary and pituitary of the New Zealand shortfinned eel, Anguilla australis

Alvin N. Setiawan, Yuichi Ozaki, Alireza Shoae, Yukinori Kazeto, P. Mark Lokman

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The evidence for androgens having a pivotal role in the functioning of the female reproductive axis - such as initiating puberty or vitellogenesis - is mounting. However, the use of aromatizable androgens and the tissue-specific focus of most studies often make it unclear if androgenic effects throughout the axis proceed via androgen or estrogen signalling mechanisms. In this study, we assessed the effects of 11-ketotestosterone (11KT, a non-aromatizable androgen) on the pituitary and ovary of previtellogenic (PV) freshwater eels Anguilla australis, comparing them with eels naturally undergoing early vitellogenesis (EV). We found that 11KT treatment produces molecular and morpho-physiological phenotypes that were generally intermediate between PV and EV. Most notably, we demonstrated that 11KT induces effects on follicle-stimulating hormone (FSH) signalling in the pituitary and ovaries that are in opposition to each other. Thus, 11KT significantly reduced fshβ subunit expression in the pituitary. At the same time, 11KT dramatically increased mRNA levels of ovarian FSH receptor and plasma levels of estradiol-17β, very likely sensitizing the previtellogenic follicle to the FSH signal. Androgens therefore may be important in facilitating puberty in the eel.

Original languageEnglish
Pages (from-to)132-143
Number of pages12
JournalGeneral and Comparative Endocrinology
Volume176
Issue number2
DOIs
Publication statusPublished - 2012 Apr 1
Externally publishedYes

Fingerprint

Anguilla
Eels
follicle-stimulating hormone
Follicle Stimulating Hormone
androgens
eel
New Zealand
Androgens
Ovary
Vitellogenesis
vitellogenesis
puberty
Puberty
Anguillidae
FSH Receptors
Ovarian Follicle
ovarian follicles
Fresh Water
estrogens
estradiol

Keywords

  • 11-Ketotestosterone
  • Androgen
  • Eel
  • Gonadotropin
  • Ovary

ASJC Scopus subject areas

  • Endocrinology

Cite this

Androgen-specific regulation of FSH signalling in the previtellogenic ovary and pituitary of the New Zealand shortfinned eel, Anguilla australis. / Setiawan, Alvin N.; Ozaki, Yuichi; Shoae, Alireza; Kazeto, Yukinori; Lokman, P. Mark.

In: General and Comparative Endocrinology, Vol. 176, No. 2, 01.04.2012, p. 132-143.

Research output: Contribution to journalArticle

Setiawan, Alvin N. ; Ozaki, Yuichi ; Shoae, Alireza ; Kazeto, Yukinori ; Lokman, P. Mark. / Androgen-specific regulation of FSH signalling in the previtellogenic ovary and pituitary of the New Zealand shortfinned eel, Anguilla australis. In: General and Comparative Endocrinology. 2012 ; Vol. 176, No. 2. pp. 132-143.
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