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Ghrelin -- a new endogenous growth hormone secretagogue.

Authors
  • Rosická, M
  • Krsek, M
  • Jarkovská, Z
  • Marek, J
  • Schreiber, V
Type
Published Article
Journal
Physiological research / Academia Scientiarum Bohemoslovaca
Publication Date
Jan 01, 2002
Volume
51
Issue
5
Pages
435–441
Identifiers
PMID: 12470195
Source
Medline
License
Unknown

Abstract

Ghrelin is a new endogenous peptide, discovered in 1999 by Kojima et al., as the result of a search for an endogenous ligand for an orphan receptor of known structure and function. Ghrelin is composed of 28 amino acids and is produced mostly by cells of the stomach, hypothalamus, and hypophysis, but it has also been detected in other tissues. Its discovery is related to the development of a new hypothesis regarding the regulation of growth hormone secretion. It is an antagonist of somatostatin. Ghrelin activates the release of growth hormone from the somatotrophic cells of the hypophysis. It participates in the regulation of energy homeostasis, increases food intake, decreases energy output and exerts a lipogenetic effect. Its metabolic effects do not depend on the GH/IGF-I system, but are mediated by the NPY/Y1 and AGRP receptor system. Ghrelin influences the secretion and motility of the gastrointestinal tract, especially the stomach. The presence of ghrelin and its receptors has also been demonstrated in many other tissues. Its function in these tissues has not yet been studied, thus providing many possibilities for further research.

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