Journal ArticleDOI
Ghrelin: Structure and Function
Masayasu Kojima,Kenji Kangawa +1 more
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TLDR
The discovery of ghrelin indicates that the release of GH from the pituitary might be regulated not only by hypothalamic GH-releasing hormone, but also by gh Relin derived from the stomach, which plays important roles for maintaining GH release and energy homeostasis in vertebrates.Abstract:
Small synthetic molecules called growth hormone secretagogues (GHSs) stimulate the release of growth hormone (GH) from the pituitary. They act through the GHS-R, a G protein-coupled receptor whose ligand has only been discovered recently. Using a reverse pharmacology paradigm with a stable cell line expressing GHS-R, we purified an endogenous ligand for GHS-R from rat stomach and named it "ghrelin," after a word root ("ghre") in Proto-Indo-European languages meaning "grow." Ghrelin is a peptide hormone in which the third amino acid, usually a serine but in some species a threonine, is modified by a fatty acid; this modification is essential for ghrelin's activity. The discovery of ghrelin indicates that the release of GH from the pituitary might be regulated not only by hypothalamic GH-releasing hormone, but also by ghrelin derived from the stomach. In addition, ghrelin stimulates appetite by acting on the hypothalamic arcuate nucleus, a region known to control food intake. Ghrelin is orexigenic; it is secreted from the stomach and circulates in the bloodstream under fasting conditions, indicating that it transmits a hunger signal from the periphery to the central nervous system. Taking into account all these activities, ghrelin plays important roles for maintaining GH release and energy homeostasis in vertebrates.read more
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References
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Journal ArticleDOI
Ghrelin is a growth-hormone-releasing acylated peptide from stomach.
TL;DR: The occurrence of ghrelin in both rat and human indicates that GH release from the pituitary may be regulated not only by hypothalamic GHRH, but also by ghrelIn, a peptide specifically releases GH both in vivo and in vitro.
Journal ArticleDOI
Central nervous system control of food intake
TL;DR: A model is described that delineates the roles of individual hormonal and neuropeptide signalling pathways in the control of food intake and the means by which obesity can arise from inherited or acquired defects in their function.
Journal ArticleDOI
Orexins and Orexin Receptors: A Family of Hypothalamic Neuropeptides and G Protein-Coupled Receptors that Regulate Feeding Behavior
Takeshi Sakurai,Akira Amemiya,Makoto Ishii,Ichiyo Matsuzaki,Richard M. Chemelli,Hirokazu Tanaka,S. Clay Williams,James A. Richardson,Gerald P. Kozlowski,Shelagh Wilson,Jonathan R.S. Arch,Robin E. Buckingham,Andrea C. Haynes,Steven A. Carr,Roland S. Annan,Dean E. McNulty,Wu Schyong Liu,Jonathan A. Terrett,Nabil Elshourbagy,Derk J. Bergsma,Masashi Yanagisawa +20 more
TL;DR: Two novel neuropeptides are identified, both derived from the same precursor by proteolytic processing, that bind and activate two closely related (previously) orphan G protein-coupled receptors in the hypothalamus of rats.
Journal ArticleDOI
Ghrelin induces adiposity in rodents.
TL;DR: It is proposed that ghrelin, in addition to its role in regulating GH secretion, signals the hypothalamus when an increase in metabolic efficiency is necessary, suggesting an involvement in regulation of energy balance.
Journal ArticleDOI
A role for ghrelin in the central regulation of feeding.
Masamitsu Nakazato,Noboru Murakami,Yukari Date,Masayasu Kojima,Hisayuki Matsuo,Kenji Kangawa,Shigeru Matsukura +6 more
TL;DR: It is shown that ghrelin is involved in the hypothalamic regulation of energy homeostasis and probably has a function in growth regulation by stimulating feeding and release of growth hormone.
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