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  • Title: Comparisons between the effects of 5-HT and DL-fenfluramine on food intake and gastric emptying in the rat.
    Author: Francis J, Critchley D, Dourish CT, Cooper SJ.
    Journal: Pharmacol Biochem Behav; 1995 Apr; 50(4):581-5. PubMed ID: 7617704.
    Abstract:
    5-Hydroxytryptamine (5-HT) dose-dependently increased gastric emptying in rats, whereas DL-fenfluramine produced a biphasic dose response curve for gastric emptying. Thus, fenfluramine increased gastric emptying at a dose of 0.1 mg/kg but decreased it at doses of 1 and 3 mg/kg. Both 5-HT and DL-fenfluramine produced significant decreases in food intake. As 5-HT produced opposing effects on gastric emptying and food intake, it appears that the anorectic effect of 5-HT may not depend on changes in the rate of gastric emptying. In contrast, doses of DL-fenfluramine that decreased feeding also decreased gastric emptying, which suggests that reduced food intake may at least partly result from decreased gastric emptying. Taken together, these results suggest that the effects of 5-HT and DL-fenfluramine on feeding and gastric emptying may be mediated by different mechanisms.
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