Mutual interaction of kisspeptin, estrogen and bone morphogenetic protein-4 activity in GnRH regulation by GT1-7 cells

Tomohiro Terasaka, Fumio Otsuka, Naoko Tsukamoto, Eri Nakamura, Kenichi Inagaki, Kishio Toma, Kanako Ogura-Ochi, Christine Glidewell-Kenney, Mark A. Lawson, Hirofumi Makino

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Reproduction is integrated by interaction of neural and hormonal signals converging on hypothalamic neurons for controlling gonadotropin-releasing hormone (GnRH). Kisspeptin, the peptide product of the kiss1 gene and the endogenous agonist for the GRP54 receptor, plays a key role in the regulation of GnRH secretion. In the present study, we investigated the interaction between kisspeptin, estrogen and BMPs in the regulation of GnRH production by using mouse hypothalamic GT1-7 cells. Treatment with kisspeptin increased GnRH mRNA expression and GnRH protein production in a concentration-dependent manner. The expression levels of kiss1 and GPR54 were not changed by kisspeptin stimulation. Kisspeptin induction of GnRH was suppressed by co-treatment with BMPs, with BMP-4 action being the most potent for suppressing the kisspeptin effect. The expression of kisspeptin receptor, GPR54, was suppressed by BMPs, and this effect was reversed in the presence of kisspeptin. It was also revealed that BMP-induced Smad1/5/8 phosphorylation and Id-1 expression were suppressed and inhibitory Smad6/7 was induced by kisspeptin. In addition, estrogen induced GPR54 expression, while kisspeptin increased the expression levels of ERα and ERβ, suggesting that the actions of estrogen and kisspeptin are mutually enhanced in GT1-7 cells. Moreover, kisspeptin stimulated MAPKs and AKT signaling, and ERK signaling was functionally involved in the kisspeptin-induced GnRH expression. BMP-4 was found to suppress kisspeptin-induced GnRH expression by reducing ERK signaling activity. Collectively, the results indicate that the axis of kisspeptin-induced GnRH production is bi-directionally controlled, being augmented by an interaction between ERα/β and GPR54 signaling and suppressed by BMP-4 action in GT1-7 neuron cells.

Original languageEnglish
Pages (from-to)8-15
Number of pages8
JournalMolecular and cellular endocrinology
Volume381
Issue number1-2
DOIs
Publication statusPublished - Dec 5 2013

Keywords

  • BMP
  • Estradiol
  • GPR54
  • GnRH
  • Kisspeptin
  • MAPK

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Fingerprint Dive into the research topics of 'Mutual interaction of kisspeptin, estrogen and bone morphogenetic protein-4 activity in GnRH regulation by GT1-7 cells'. Together they form a unique fingerprint.

  • Cite this