title: Amylin blunts hyperphagia and reduces weight and fat gain during recovery in socially stressed rats.
abstract: During recovery from social stress in a visible burrow system (VBS), during which a dominance hierarchy is formed among the males, rats display hyperphagia and gain weight preferentially as visceral adipose tissue. By proportionally increasing visceral adiposity, social stress may contribute to the establishment of metabolic disorder. Amylin was administered to rats fed ad libitum during recovery from VBS stress in an attempt to prevent hyperphagia and the resultant gain in body weight and fat mass. Amylin treatment reduced food intake, weight gain, and accumulation of fat mass in male burrow rats, but not in male controls that spent time housed with a single female rather than in the VBS. Amylin did not alter neuropeptide Y (NPY), agouti-related peptide (AgRP), or proopiomelanocortin (POMC) mRNA expression in the arcuate nucleus of the hypothalamus as measured at the end of the recovery period, nor did it affect plasma corticosterone or leptin. Amylin exerted most of its effect on food intake during the first few days of recovery, possibly through antagonism of NPY and/or increasing leptin sensitivity. The potential for chronic social stress to contribute to metabolic disorder is diminished by amylin treatment, though the neuroendocrine mechanisms behind this effect remain elusive.
authors: Department of Behavioral Psychiatry, University of Cincinnati Medical Center, Ohio, USA.
authors: Michael
authors: M
authors: Smeltzer
authors: Karen
authors: K
authors: Scott
authors: Susan
authors: S
authors: Melhorn
authors: Eric
authors: E
authors: Krause
authors: Randall
authors: R
authors: Sakai
mesh_terms: D000273:Adipose Tissue / Q000187:drug effects*; D054369:Agouti-Related Protein / Q000235:genetics / Q000378:metabolism; D000818:Animals; D001111:Arcuate Nucleus of Hypothalamus / Q000187:drug effects / Q000378:metabolism; D004435:Eating / Q000187:drug effects; D005260:Female; D005786:Gene Expression Regulation / Q000502:physiology; D006963:Hyperphagia / Q000188:drug therapy*; D058228:Islet Amyloid Polypeptide / Q000494:pharmacology*; D008297:Male; D009478:Neuropeptide Y; D011333:Pro-Opiomelanocortin / Q000235:genetics / Q000378:metabolism; D051381:Rats; D012919:Social Behavior; D013315:Stress, Psychological / Q000378:metabolism*; D013997:Time Factors; D015430:Weight Gain / Q000187:drug effects*
chemical_list: D054369:Agouti-Related Protein; D058228:Islet Amyloid Polypeptide; D009478:Neuropeptide Y; D011333:Pro-Opiomelanocortin