title: Ovine corticotropin-releasing hormone (oCRH) exerts an anxiogenic-like action in the goldfish, Carassius auratus.
abstract: Corticotropin-releasing hormone (CRH) is a member of the hypothalamic neuropeptide family that includes urocortins, urotensin I and sauvagine in vertebrates. CRH and urocortin act as anorexigenic factors for satiety regulation in rodents. In a goldfish model, intracerebroventricular (ICV) administration of ovine CRH (oCRH) affects not only food intake, but also locomotor activity. However, there is no information regarding the psychophysiological roles of CRH in goldfish. Therefore, we investigated the effect of oCRH on psychomotor activity in this species. ICV administration of synthetic oCRH at 20 pmol/g body weight (BW) enhanced locomotor activity. Since intact goldfish prefer the lower to the upper area of a tank, we developed a method for measuring the time taken for fish to move from the lower to the upper area. ICV administration of oCRH at 20 pmol/g BW and the central-type benzodiazepine receptor inverse agonist FG-7142 (an anxiogenic agent) at 1-4 pmol/g BW both increased the time taken to move from the lower to the upper area. This anxiogenic-like effect of oCRH was abolished by the CRH receptor antagonist α-helical CRH(9-41) (100 pmol/g BW). These results indicate that CRH can potently affect locomotor and psychomotor activities in goldfish.
authors: Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan. kmatsuda@sci.u-toyama.ac.jp
authors: Kouhei
authors: K
authors: Matsuda
authors: Yasunari
authors: Y
authors: Hagiwara
authors: Haruki
authors: H
authors: Shibata
authors: Atsushi
authors: A
authors: Sakashita
authors: Kohei
authors: K
authors: Wada
mesh_terms: D000818:Animals; D014151:Anti-Anxiety Agents / Q000494:pharmacology*; D002243:Carbolines / Q000494:pharmacology; D003346:Corticotropin-Releasing Hormone / Q000494:pharmacology*; D006054:Goldfish / Q000502:physiology*; D008124:Locomotion / Q000187:drug effects; D012756:Sheep
chemical_list: D014151:Anti-Anxiety Agents; D002243:Carbolines; C035874:FG 7142; D003346:Corticotropin-Releasing Hormone