Inhibitory effect of chicken gonadotropin-releasing hormone II on food intake in the goldfish, Carassius auratus

Gonadotropin-releasing hormone (GnRH) is an evolutionarily conserved neuropeptide with 10 amino acid residues, which possesses some structural variants. A molecular form known as chicken GnRH II ([His 5 Trp 7 Tyr 8] GnRH, cGnRH II) is widely distributed in vertebrates, and has recently been implicat...

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Veröffentlicht in:Hormones and behavior 2008-06, Vol.54 (1), p.83-89
Hauptverfasser: Matsuda, Kouhei, Nakamura, Kouta, Shimakura, Sei-Ichi, Miura, Tohru, Kageyama, Haruaki, Uchiyama, Minoru, Shioda, Seiji, Ando, Hironori
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container_issue 1
container_start_page 83
container_title Hormones and behavior
container_volume 54
creator Matsuda, Kouhei
Nakamura, Kouta
Shimakura, Sei-Ichi
Miura, Tohru
Kageyama, Haruaki
Uchiyama, Minoru
Shioda, Seiji
Ando, Hironori
description Gonadotropin-releasing hormone (GnRH) is an evolutionarily conserved neuropeptide with 10 amino acid residues, which possesses some structural variants. A molecular form known as chicken GnRH II ([His 5 Trp 7 Tyr 8] GnRH, cGnRH II) is widely distributed in vertebrates, and has recently been implicated in the regulation of sexual behavior and food intake in an insectivore, the musk shrew. However, the influence of cGnRH II on feeding behavior has not yet been studied in model animals such as rodents and teleost fish. In this study, therefore, we investigated the role of cGnRH II in the regulation of feeding behavior in the goldfish, and examined its involvement in food intake after intracerebroventricular (ICV) administration. ICV-injected cGnRH II at graded doses, from 0.1 to 10 pmol/g body weight (BW), induced a decrease of food consumption in a dose-dependent manner during 60 min after treatment. Cumulative food intake was significantly decreased by ICV injection of cGnRH II at doses of 1 and 10 pmol/g BW during the 60-min post-treatment observation period. ICV injection of salmon GnRH ([Trp 7 Leu 8] GnRH, sGnRH) at doses of 0.1–10 pmol/g BW did not affect food intake. The anorexigenic action of cGnRH II was completely blocked by treatment with the GnRH type I receptor antagonist, Antide. However, the anorexigenic action of cGnRH II was not inhibited by treatment with the corticotropin-releasing hormone (CRH) 1/2 receptor antagonist, α-helical CRH (9−41), and the melanocortin 4 receptor antagonist, HS024. These results suggest that, in the goldfish, cGnRH II, but not sGnRH, acts as an anorexigenic factor, as is the case in the musk shrew, and that the anorexigenic action of cGnRH II is independent of CRH- and melanocortin-signaling pathways.
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A molecular form known as chicken GnRH II ([His 5 Trp 7 Tyr 8] GnRH, cGnRH II) is widely distributed in vertebrates, and has recently been implicated in the regulation of sexual behavior and food intake in an insectivore, the musk shrew. However, the influence of cGnRH II on feeding behavior has not yet been studied in model animals such as rodents and teleost fish. In this study, therefore, we investigated the role of cGnRH II in the regulation of feeding behavior in the goldfish, and examined its involvement in food intake after intracerebroventricular (ICV) administration. ICV-injected cGnRH II at graded doses, from 0.1 to 10 pmol/g body weight (BW), induced a decrease of food consumption in a dose-dependent manner during 60 min after treatment. Cumulative food intake was significantly decreased by ICV injection of cGnRH II at doses of 1 and 10 pmol/g BW during the 60-min post-treatment observation period. ICV injection of salmon GnRH ([Trp 7 Leu 8] GnRH, sGnRH) at doses of 0.1–10 pmol/g BW did not affect food intake. The anorexigenic action of cGnRH II was completely blocked by treatment with the GnRH type I receptor antagonist, Antide. However, the anorexigenic action of cGnRH II was not inhibited by treatment with the corticotropin-releasing hormone (CRH) 1/2 receptor antagonist, α-helical CRH (9−41), and the melanocortin 4 receptor antagonist, HS024. 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A molecular form known as chicken GnRH II ([His 5 Trp 7 Tyr 8] GnRH, cGnRH II) is widely distributed in vertebrates, and has recently been implicated in the regulation of sexual behavior and food intake in an insectivore, the musk shrew. However, the influence of cGnRH II on feeding behavior has not yet been studied in model animals such as rodents and teleost fish. In this study, therefore, we investigated the role of cGnRH II in the regulation of feeding behavior in the goldfish, and examined its involvement in food intake after intracerebroventricular (ICV) administration. ICV-injected cGnRH II at graded doses, from 0.1 to 10 pmol/g body weight (BW), induced a decrease of food consumption in a dose-dependent manner during 60 min after treatment. Cumulative food intake was significantly decreased by ICV injection of cGnRH II at doses of 1 and 10 pmol/g BW during the 60-min post-treatment observation period. ICV injection of salmon GnRH ([Trp 7 Leu 8] GnRH, sGnRH) at doses of 0.1–10 pmol/g BW did not affect food intake. The anorexigenic action of cGnRH II was completely blocked by treatment with the GnRH type I receptor antagonist, Antide. However, the anorexigenic action of cGnRH II was not inhibited by treatment with the corticotropin-releasing hormone (CRH) 1/2 receptor antagonist, α-helical CRH (9−41), and the melanocortin 4 receptor antagonist, HS024. 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A molecular form known as chicken GnRH II ([His 5 Trp 7 Tyr 8] GnRH, cGnRH II) is widely distributed in vertebrates, and has recently been implicated in the regulation of sexual behavior and food intake in an insectivore, the musk shrew. However, the influence of cGnRH II on feeding behavior has not yet been studied in model animals such as rodents and teleost fish. In this study, therefore, we investigated the role of cGnRH II in the regulation of feeding behavior in the goldfish, and examined its involvement in food intake after intracerebroventricular (ICV) administration. ICV-injected cGnRH II at graded doses, from 0.1 to 10 pmol/g body weight (BW), induced a decrease of food consumption in a dose-dependent manner during 60 min after treatment. Cumulative food intake was significantly decreased by ICV injection of cGnRH II at doses of 1 and 10 pmol/g BW during the 60-min post-treatment observation period. ICV injection of salmon GnRH ([Trp 7 Leu 8] GnRH, sGnRH) at doses of 0.1–10 pmol/g BW did not affect food intake. The anorexigenic action of cGnRH II was completely blocked by treatment with the GnRH type I receptor antagonist, Antide. However, the anorexigenic action of cGnRH II was not inhibited by treatment with the corticotropin-releasing hormone (CRH) 1/2 receptor antagonist, α-helical CRH (9−41), and the melanocortin 4 receptor antagonist, HS024. These results suggest that, in the goldfish, cGnRH II, but not sGnRH, acts as an anorexigenic factor, as is the case in the musk shrew, and that the anorexigenic action of cGnRH II is independent of CRH- and melanocortin-signaling pathways.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><pmid>18342861</pmid><doi>10.1016/j.yhbeh.2008.01.011</doi><tpages>7</tpages></addata></record>
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subjects Animal behavior
Animals
Anorexia - chemically induced
Anorexigenic action
Antide
Behavioral psychophysiology
Biological and medical sciences
Brackish
Carassius auratus
Chicken GnRH II
Chickens
Corticotropin-Releasing Hormone - antagonists & inhibitors
Corticotropin-Releasing Hormone - pharmacology
Eating - drug effects
Eating - physiology
Female
Fish
Food intake
Freshwater
Fundamental and applied biological sciences. Psychology
Goldfish
Goldfish - physiology
Gonadotropin-Releasing Hormone - administration & dosage
Gonadotropin-Releasing Hormone - analogs & derivatives
Gonadotropin-Releasing Hormone - pharmacology
Hormone Antagonists - pharmacology
Hormones
Hormones and behavior
ICV administration
Injections, Intraventricular
Male
Marine
Oligopeptides - pharmacology
Peptide Fragments - pharmacology
Peptides, Cyclic - pharmacology
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Receptors, Corticotropin - antagonists & inhibitors
Salmonidae
Sex Characteristics
Teleostei
title Inhibitory effect of chicken gonadotropin-releasing hormone II on food intake in the goldfish, Carassius auratus
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