Serotonin infusion in the SCN reduces casein ingestion in rats

Author(s): Mok, E., Nagai, K., Wong, C. Y.

Journal/Book: Physiol Behav. 1999; 68: the Boulevard Langford Lane, Kidlington, Oxford Ox5 1GB, England. Pergamon-Elsevier Science Ltd. 37-45.

Abstract: To compare food and water intakes, adult male Wister rats were infused during 7 days with serotonin (5-HT, 2.5 nmol/24 h) or artificial cerebrospinal fluid (CSF) in the suprachiasmatic nucleus (SCN) in a three-way selection of macronutrient-rich diets. Nocturnal energy intake from the casein-rich diet was significantly lower during infusion of 5-HT than before infusion. Decrease in nocturnal casein consumption was significant in the middle dark phase. Within the infusion period, water intake was reduced by 5-HT infusion during the early, middle and late light phase. The present results reinforce the hypothesis of a serotonergic control of water intake and provide evidence for SCN 5-HT involvement in casein-specific dietary selection.

Note: Article Thibault L, McGill Univ, Sch Dietet & Human Nutr, 21111 Lakeshore Rd, St Anne De Bellevue, PQ H9X 3V9, CANADA

Keyword(s): serotonin; suprachiasmatic nuclei; infusion; macronutrient intake; water intake; circadian rhythm; DIETARY SELF-SELECTION; MACRONUTRIENT INTAKE; MEAL PATTERNS; BODY-WEIGHT; HYPOTHALAMIC SEROTONIN; ETHANOL-CONSUMPTION; FEEDING-BEHAVIOR; DL-FENFLURAMINE; FOOD-INTAKE; PROTEIN

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