title: Hypothalamic growth hormone secretagogue receptor regulates growth hormone secretion, feeding, and adiposity.
abstract: Growth hormone secretagogues (GHSs) stimulate GH secretion and food intake. GHS receptor (GHS-R) mRNA has been identified mainly in the arcuate nucleus (Arc) and ventromedial nucleus of the hypothalamus and in the pituitary. Ghrelin, an endogenous ligand for GHS-R, has recently been purified from rat stomach. Although ghrelin is also expressed in the hypothalamus, the physiological significance of the ghrelin/GHS-R system is still unknown. We have created transgenic (Tg) rats expressing an antisense GHS-R mRNA under the control of the promoter for tyrosine hydroxylase (TH), thus selectively attenuating GHS-R protein expression in the Arc. Tg rats had lower body weight and less adipose tissue than did control rats. Daily food intake was reduced, and the stimulatory effect of GHS treatment on feeding was abolished in Tg rats. GH secretion and plasma insulin-like growth factor-I levels were reduced in female Tg rats. These results suggest that GHS-R in the Arc is involved in the regulation of GH secretion, food intake, and adiposity.
authors.affiliation: Department of Medicine, Nippon Medical School, Tokyo, Japan. shuto@nms.ac.jp
authors.forename: Yujin
authors.initials: Y
authors.lastname: Shuto
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Shibasaki
authors.forename: Asuka
authors.initials: A
authors.lastname: Otagiri
authors.forename: Hideki
authors.initials: H
authors.lastname: Kuriyama
authors.forename: Hisayuki
authors.initials: H
authors.lastname: Ohata
authors.forename: Hideki
authors.initials: H
authors.lastname: Tamura
authors.forename: Jun
authors.initials: J
authors.lastname: Kamegai
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sugihara
authors.forename: Shinichi
authors.initials: S
authors.lastname: Oikawa
authors.forename: Ichiji
authors.initials: I
authors.lastname: Wakabayashi
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000818:Animals; D030801:Animals, Genetically Modified; D015153:Blotting, Western; D004247:DNA / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005260:Female; D005753:Gastric Mucosa / Q000378:metabolism; D054439:Ghrelin; D013006:Growth Hormone / Q000378:metabolism*; D007031:Hypothalamus / Q000378:metabolism; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D008024:Ligands; D008297:Male; D016376:Oligonucleotides, Antisense / Q000378:metabolism; D009842:Oligopeptides / Q000494:pharmacology; D036361:Peptide Hormones; D010455:Peptides / Q000502:physiology*; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D011956:Receptors, Cell Surface / Q000378:metabolism* / Q000502:physiology*; D043562:Receptors, G-Protein-Coupled; D054440:Receptors, Ghrelin; D012737:Sex Factors; D013997:Time Factors
chemical_list: D054439:Ghrelin; D008024:Ligands; D016376:Oligonucleotides, Antisense; D009842:Oligopeptides; D036361:Peptide Hormones; D010455:Peptides; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; D043562:Receptors, G-Protein-Coupled; D054440:Receptors, Ghrelin; D013006:Growth Hormone; D004247:DNA; C091874:growth hormone-releasing peptide-2