Journal
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
Volume 149, Issue 2, Pages 109-128Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpa.2007.12.004
Keywords
amphibians; birds; brain; fish; food intake; ghrelin; gut; hormones; peptides; reptiles
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In mammals, ghrelin is a non-amidated peptide hormone, existing in both acylated and non-acylated forms, produced mainly from the X/A or ghrelin cells present in the mucosal layer of the stomach. Ghrelin is a natural ligand of the growth hormone (GH) secretagogue-receptor (GHS-R), and functions primarily as a GH-releasing hormone and an orexigen, as well as having several other biological actions. Among non-mammalian vertebrates, amino acid sequence of ghrelin has been reported in two species of cartilaginous fish, seven species of teleosts, two species of amphibians, one species of reptile and six species of birds. The structure and functions of ghrelin are highly conserved among vertebrates. This review presents a concise overview of ghrelin biology in non-mammalian vertebrates. (C) 2007 Elsevier Inc. All rights reserved.
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