Cholecystokinin-decreased food intake in rhesus monkeys.
Five rhesus monkeys were infused intravenously with partially purified cholecystokinin (CCK) Just prior to a test meal of solid food after overnight food deprivation; CCK produced large, rapid, dose related suppressions of feeding. The lowest dose tested (5 Ivy U/kg body wt) produced a significant inhibition of food intake (26% suppression, P less than 0.05). Equivalent infusions of partially purified CCK or the synthetic COOH-terminal octapeptide of CCK (a pure fragment with all the biological activity of the full molecule) produced equivalent suppressions. In a second experiment, gastric preloads of a potent releaser of endogenous CCK, L-phenylalanine (L-Phe), and a weak releaser, D-phenylalanine (D-Phe) were compared for their relative abilities to suppress food intake at a test meal in nine rhesus monkeys after overnight deprivation. L-Phenylalanine produced large, rapid, dose-related suppressions of feeding, but D-Phe did not. The threshold dose of L-Phe was 0.5 g/kg (32% suppression, P less than 0.01). Neither CCK nor L-Phe caused signs of illness in these experiments. The results demonstrate that intravenous exogenous CCK suppresses feeding in rhesus monkeys and suggest that endogenous CCK has the same effect; they are consistent with the hypothesis that CCK is a satiety signal.
D000818:Animals; D002766:Cholecystokinin / Q000494:pharmacology*; D003864:Depression, Chemical; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects*; D000882:Haplorhini; D007536:Isomerism; D008253:Macaca mulatta; D008297:Male; D010649:Phenylalanine / Q000494:pharmacology
D010649:Phenylalanine; D002766:Cholecystokinin