title: Peptide YY(3-36) inhibits gastric emptying and produces acute reductions in food intake in rhesus monkeys.
abstract: Peptide YY3-36 [PYY(3-36)], a gastrointestinal peptide that is released into the circulation in response to ingesting a meal, has recently been suggested to play a role in controlling food intake. PYY(3-36) has been reported to inhibit food intake following peripheral administration in rodents and in human subjects. To more fully characterize the potential feeding actions of PYY(3-36), we examined the ability of a dose range of PYY(3-36) (0.3-3.0 nmol/kg) to affect liquid gastric emptying and daily 6-h food intake in male rhesus monkeys. Intramuscular PYY(3-36) produced a dose-related inhibition of saline gastric emptying that was maximal at a dose of 3 nmol/kg. Intramuscular PYY(3-36) administered before daily 6-h food access produced significant feeding reductions at doses of 1 and 3 nmol/kg. Analyses of the patterns of food intake across the 6-h period of food access revealed that PYY(3-36) increased the latency to the first meal and reduced average meal size without altering meal number. Although single doses of PYY(3-36) reduced intake, a suppressive effect on food intake was not sustained over multiple administrations across successive days. Together, these data suggest that PYY(3-36) has the ability to reduce food intake in acute test situations in nonhuman primates. Whether this is a physiological action of the endogenous peptide remains to be determined.
authors.affiliation: Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Ross 618, 720 Rutland Ave., Baltimore, MD 21205, USA. tmoran@jhmi.edu
authors.forename: Timothy H
authors.initials: TH
authors.lastname: Moran
authors.forename: Ulrika
authors.initials: U
authors.lastname: Smedh
authors.forename: Kimberly P
authors.initials: KP
authors.lastname: Kinzig
authors.forename: Karen A
authors.initials: KA
authors.lastname: Scott
authors.forename: Susan
authors.initials: S
authors.lastname: Knipp
authors.forename: Ellen E
authors.initials: EE
authors.lastname: Ladenheim
mesh_terms: D000818:Animals; D001069:Appetite Regulation / Q000187:drug effects / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D005746:Gastric Emptying / Q000187:drug effects / Q000502:physiology*; D008253:Macaca mulatta; D010446:Peptide Fragments; D019894:Peptide YY / Q000494:pharmacology / Q000502:physiology*
chemical_list: D010446:Peptide Fragments; D019894:Peptide YY; C061785:peptide YY (3-36)