title: Changes in orexin-A and neuropeptide y expression in the hypothalamus of obese and lean Zucker Diabetic Fatty rats.
abstract: This study was carried out to investigate the changes of orexin-A (OXA) and neuropeptide Y (NPY) expression in the hypothalamus of the obese and lean Zucker Diabetic Fatty (ZDF) rats which have a missense mutation in the leptin receptor gene. The mean body weights (MBW) between the obese and lean ZDF rats were significantly different at 28 and 70 postnatal days. However, at 14 postnatal day, there was no significant difference in the MBW between the obese and lean ZDF rats in both male and female. The OXA immunoreactivities were not significantly different between the obese and lean ZDF rats in both sexes at 14, 28, and 70 postnatal days, respectively. The NPY immunoreactivity was higher in the obese than in the lean ZDF rats in both male and female at 28 and 70 postnatal days, whereas there was no significant difference between the obese and lean ZDF rats at 14 postnatal day. These results indicate that both OXA and NPY might halt their roles for food intake in the obese phenotype of the male and female ZDF rats in the preweaning period of 14 postnatal day, whereas NPY might play a main role in the obesity of these rats in the weaning period of 28 and 70 postnatal days.
authors.affiliation: Department of Anatomy and Cell Biology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, South Korea.
authors.forename: Eun Sung
authors.initials: ES
authors.lastname: Park
authors.forename: Je Kyung
authors.initials: JK
authors.lastname: Seong
authors.forename: Seong Joon
authors.initials: SJ
authors.lastname: Yi
authors.forename: Jin Sang
authors.initials: JS
authors.lastname: Kim
authors.forename: Heungshik S
authors.initials: HS
authors.lastname: Lee
authors.forename: In Se
authors.initials: IS
authors.lastname: Lee
authors.forename: Yeo Sung
authors.initials: YS
authors.lastname: Yoon
mesh_terms: D000367:Age Factors; D000818:Animals; D001835:Body Weight; D005260:Female; D015870:Gene Expression; D005838:Genotype; D007031:Hypothalamus / Q000378:metabolism*; D007150:Immunohistochemistry; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D008297:Male; D020125:Mutation, Missense / Q000235:genetics; D009474:Neurons / Q000378:metabolism; D009478:Neuropeptide Y / Q000378:metabolism*; D009479:Neuropeptides / Q000378:metabolism*; D064446:Orexin Receptors; D000068797:Orexins; D051381:Rats / Q000235:genetics / Q000378:metabolism*; D011924:Rats, Zucker; D011956:Receptors, Cell Surface / Q000235:genetics*; D043562:Receptors, G-Protein-Coupled; D054411:Receptors, Leptin; D018013:Receptors, Neuropeptide; D014886:Weaning
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D009478:Neuropeptide Y; D009479:Neuropeptides; D064446:Orexin Receptors; D000068797:Orexins; D011956:Receptors, Cell Surface; D043562:Receptors, G-Protein-Coupled; D054411:Receptors, Leptin; D018013:Receptors, Neuropeptide