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Cell and Tissue Research

, Volume 379, Issue 2, pp 349–372 | Cite as

Distribution of Kiss2 receptor in the brain and its localization in neuroendocrine cells in the zebrafish

  • Satoshi Ogawa
  • Mageswary Sivalingam
  • Rachel Anthonysamy
  • Ishwar S. ParharEmail author
Regular Article
  • 287 Downloads

Abstract

Kisspeptin is a hypothalamic neuropeptide, which acts directly on gonadotropin-releasing hormone (GnRH)-secreting neurons via its cognate receptor (GPR54 or Kiss-R) to stimulate GnRH secretion in mammals. In non-mammalian vertebrates, there are multiple kisspeptins (Kiss1 and Kiss2) and Kiss-R types. Recent gene knockout studies have demonstrated that fish kisspeptin systems are not essential in the regulation of reproduction. Studying the detailed distribution of kisspeptin receptor in the brain and pituitary is important for understanding the multiple action sites and potential functions of the kisspeptin system. In the present study, we generated a specific antibody against zebrafish Kiss2-R (=Kiss1Ra/GPR54-1/Kiss-R2/KissR3) and examined its distribution in the brain and pituitary. Kiss2-R-immunoreactive cell bodies are widely distributed in the brain including in the dorsal telencephalon, preoptic area, hypothalamus, optic tectum, and in the hindbrain regions. Double-labeling showed that not all but a subset of preoptic GnRH3 neurons expresses Kiss2-R, while Kiss2-R is expressed in most of the olfactory GnRH3 neurons. In the posterior preoptic region, Kiss2-R immunoreactivity was seen in vasotocin cells. In the pituitary, Kiss2-R immunoreactivity was seen in corticotropes, but not in gonadotropes. The results in this study suggest that Kiss2 and Kiss2-R signaling directly serve non-reproductive functions and indirectly subserve reproductive functions in teleosts.

Keywords

Kisspeptin GnRH GPR54 Reproduction Teleost 

Notes

Author contributions

SO and ISP designed research; SO and ISP created antiserum for zebrafish Kiss2 receptor; MS and RA performed and analyzed the ISH and ICC experiments; MS performed Western blot analysis; MS and SO analyzed the data; and SO, MS, and ISP wrote the paper.

Funding

This work was supported by grants from the Malaysian Ministry of Higher Education, FRGS/2/2010/ST/MUSM/03/2, FRGS/1/2014/ST03/MUSM/02/1 (to S.O.), FRGS/1/2016/STG03/MUSM/01/1 (to I.S.P) and Monash University Malaysia, SO-10-01 (to S.O.), IP-09-01 (to I.S.P).

Compliance with ethical statements

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All experimental procedures were performed under the guidelines of the Animal Ethics Committee of Monash University (approval number: MARP/2012/120).

Supplementary material

441_2019_3089_Fig12_ESM.png (1.6 mb)
Supplementary Figure 1.

Photomicrographs of immunoreactivity of the mouse anti-human POMC antibody (POMC-Ab, A) and DIG-in situ hybridization of pomc mRNA (B) in the pituitary of zebrafish. In the RPD region, very weak POMC-immunoreactivity were observed (arrows). Scale bars: 100 μm (PNG 1606 kb)

441_2019_3089_MOESM1_ESM.tif (16.6 mb)
High resolution image (TIF 17026 kb)

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Copyright information

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

Authors and Affiliations

  • Satoshi Ogawa
    • 1
  • Mageswary Sivalingam
    • 1
  • Rachel Anthonysamy
    • 1
  • Ishwar S. Parhar
    • 1
    Email author
  1. 1.Brain Research Institute, Jeffrey Cheah School of Medicine and Health SciencesMonash University MalaysiaBandar SunwayMalaysia

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