title: Intracerebroventricular injection of glucagon-like peptide-1 changes lipid metabolism in chicks.
abstract: Glucagon-like peptide-1 (GLP-1), derived from proglucagon, is thought to act as a negative regulator of energy homeostasis in mammals, since intracerebroventricular (ICV) injection of GLP-1 inhibits feeding behavior and enhances energy expenditure. The anorexigenic effect of GLP-1 is also observed in chicks, but whether brain GLP-1 enhances energy expenditure has not been investigated. The aim of the present study was to clarify the effect of ICV injection of GLP-1 on energy expenditure as well as metabolic changes in chicks. The injection of GLP-1 did not affect energy expenditure calculated from oxygen consumption and carbon dioxide production. On the other hand, the injection of GLP-1 significantly decreased respiratory quotient, suggesting that brain GLP-1 shifted the use of energy sources from carbohydrates to lipids. In support of this, ICV injection of GLP-1 increased plasma non-esterified fatty acid concentration while plasma glucose concentration was decreased. In conclusion, GLP-1 appears to act in the brain as a metabolic modulator rather than as a regulator of total energy expenditure in chicks.
authors.affiliation: Laboratory of Advanced Animal and Marine Bioresources, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka 812-8581, Japan. tetsu@agr.ehime-u.ac.jp
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tachibana
authors.forename: Daichi
authors.initials: D
authors.lastname: Oikawa
authors.forename: Nami
authors.initials: N
authors.lastname: Adachi
authors.forename: Tim
authors.initials: T
authors.lastname: Boswell
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Furuse
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D002245:Carbon Dioxide / Q000378:metabolism; D002645:Chickens / Q000378:metabolism*; D004734:Energy Metabolism / Q000187:drug effects; D005230:Fatty Acids, Nonesterified / Q000097:blood; D052216:Glucagon-Like Peptide 1 / Q000008:administration & dosage* / Q000494:pharmacology*; D007276:Injections, Intraventricular; D050356:Lipid Metabolism / Q000187:drug effects*; D008297:Male; D010101:Oxygen Consumption / Q000187:drug effects; D012119:Respiration / Q000187:drug effects; D014280:Triglycerides / Q000097:blood
chemical_list: D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D014280:Triglycerides; D002245:Carbon Dioxide; D052216:Glucagon-Like Peptide 1