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Region-specific changes in brain kisspeptin receptor expression during estrogen depletion and the estrous cycle

  • Saeko Ozaki
  • Shimpei Higo
  • Kinuyo Iwata
  • Hidehisa Saeki
  • Hitoshi OzawaEmail author
Original Paper
  • 89 Downloads

Abstract

Kisspeptin acts as a potent neuropeptide regulator of reproduction through modulation of the hypothalamic–pituitary–gonadal axis. Previous studies revealed sex differences in brain expression patterns as well as regulation of expression by estrogen. Alternatively, sex differences and estrogen regulation of the kisspeptin receptor (encoded by Kiss1r) have not been examined at cellular resolution. In the current study, we examined whether Kiss1r mRNA expression also exhibits estrogen sensitivity and sex-dependent differences using in situ hybridization. We compared Kiss1r mRNA expression between ovariectomized (OVX) rats and estradiol (E2)-replenished OVX rats to examine estrogen sensitivity, and compared expression between gonadally intact male rats and female rats in diestrus or proestrus to examine sex differences. In OVX rats, E2 replenishment significantly reduced Kiss1r expression specifically in the hypothalamic arcuate nucleus (ARC). A difference in Kiss1r expression was also observed between diestrus and proestrus rats in the hypothalamic paraventricular nucleus (PVN), but not in the ARC. Thus, estrogen appears to have region- and context-specific effects on Kiss1r expression. However, immunostaining revealed minimal colocalization of estrogen receptor alpha (ERα) in Kiss1r-expressing neuronal populations of ARC and PVN, indicating indirect or ERα-independent regulation of Kiss1r expression. Surprisingly, unlike the kisspeptin ligand, no sexual dimorphisms were observed in either the brain distribution of Kiss1r expression or in the number of Kiss1r-expressing neurons within enriched brain nuclei. The current study reveals marked differences in regulation between kisspeptin and kisspeptin receptor, and provides an essential foundation for further study of kisspeptin signaling and function in reproduction.

Keywords

Kisspeptin receptor GPR54 Sex difference Estrogen sensitivity 

Notes

Acknowledgements

We are grateful to Dr. M.K. Park (University of Tokyo, Tokyo, Japan) for providing anti-GnRH monoclonal antibody (LRH13). The present study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (Grants-in-Aid for Scientific Research, Grant Number 15K20062 to SH, 18K06860 to HO).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interest.

Supplementary material

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Supplementary material 3 (DOCX 14 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Saeko Ozaki
    • 1
    • 2
  • Shimpei Higo
    • 1
  • Kinuyo Iwata
    • 1
  • Hidehisa Saeki
    • 2
  • Hitoshi Ozawa
    • 1
    Email author
  1. 1.Department of Anatomy and NeurobiologyGraduate School of Medicine, Nippon Medical SchoolTokyoJapan
  2. 2.Department of DermatologyGraduate School of Medicine, Nippon Medical SchoolTokyoJapan

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