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  • Title: Inhibitory effects of pituitary adenylate cyclase-activating polypeptide (PACAP) and vasoactive intestinal peptide (VIP) on food intake in the goldfish, Carassius auratus.
    Author: Matsuda K, Maruyama K, Nakamachi T, Miura T, Uchiyama M, Shioda S.
    Journal: Peptides; 2005 Sep; 26(9):1611-6. PubMed ID: 16112400.
    Abstract:
    Pituitary adenylate cyclase-activating polypeptide (PACAP) has a similar structure to that of vasoactive intestinal peptide (VIP) and both the polypeptides belong to the same molecular group, the secretin-glucagon superfamily. PACAP and VIP have possible potency as hypothalamic factors mediating the release of pituitary hormones in the fish pituitary. However, the roles of PACAP and VIP in the central nervous systems of fish have not yet been made clear. Recently, it was reported that PACAP and/or VIP are involved in the feeding behavior of the mouse and chick. Therefore, we investigated the effects of intracerebroventricular (ICV) and intraperitoneal (IP) administration of synthetic PACAP and VIP on food intake in the goldfish, Carassius auratus. Cumulative food intake was significantly decreased by ICV injection of PACAP (11 or 22 pmol/g body weight) or VIP (11 or 22 pmol/g) during a 60-min observation period after treatment. IP administration of PACAP (44 or 88 pmol/g) or VIP (22 or 44 pmol/g) induced a significant decrease in food intake during a 60-min observation period after treatment. These results suggest that PACAP and VIP may be involved as feeding regulators in goldfish.
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