Cited by 71Regulation of Appetite and ObesityHypothalamic control of reproductive hormonesNeuropeptides and Animal Physiology

Gonadotropin-releasing hormone 2 suppresses food intake in the zebrafish, Danio rerio

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Nishiguchi, Ryo, Azuma, Morio, Yokobori, Eri, Uchiyama, Minoru, Matsuda, Kouhei·2012·Frontiers in Endocrinology

Abstract

Gonadotropin-releasing hormone (GnRH) is an evolutionarily conserved neuropeptide with 10 amino acid residues, of which several structural variants exist. A molecular form known as GnRH2 ([His(5) Trp(7) Tyr(8)]GnRH, also known as chicken GnRH II) is widely distributed in vertebrates except for rodents, and has recently been implicated in the regulation of feeding behavior in goldfish. However, the influence of GnRH2 on feeding behavior in other fish has not yet been studied. In the present study, therefore, we investigated the role of GnRH2 in the regulation of feeding behavior in a zebrafish model, and examined its involvement in food intake after intracerebroventricular (ICV) administration. ICV injection of GnRH2 at 0.1 and 1 pmol/g body weight (BW) induced a marked decrease of food consumption in a dose-dependent manner during 30 min after feeding. Cumulative food intake was significantly decreased by ICV injection of GnRH2 at 1 pmol/g BW during the 30-min post-treatment observation period. The anorexigenic action of GnRH2 was completely blocked by treatment with the GnRH type I receptor antagonist Antide at 25 pmol/g BW. We also examined the effect of feeding condition on the expression level of the GnRH2 transcript in the hypothalamus. Levels of GnRH2 mRNA obtained from fish that had been provided excess food for 7 days were higher than those in fish that had been fed normally. These results suggest that, in zebrafish, GnRH2 acts as an anorexigenic factor, as is the case in goldfish.

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Authors
Nishiguchi, R., Azuma, M., Yokobori, E., Uchiyama, M., & Matsuda, K.
Affiliations
University of Toyama (JP)
Corresponding author
Matsuda, Kouhei
Venue
Frontiers in Endocrinology
Published
2012
Volume
3
Pages
122-122
ISSN
1664-2392 (ISSN-L)
OpenAlex
W2097516054
Cited by
71
References
51
Citations by year
2026: 4 · 2025: 1 · 2024: 4 · 2023: 1 · 2022: 4 · 2021: 6 · 2020: 12 · 2019: 13 · 2018: 7 · 2017: 3 · 2016: 4 · 2015: 4 · 2014: 3 · 2013: 4 · 2012: 1
FWCI
1.71
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Endocrinology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
University of Toyama (21370025)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
chicken GnRH-II, dietary intake, feeding behavior, anorexigenic peptides, antide, zebrafish, intracerebroventricular administration

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