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Comparison of the actions of acylated and desacylated ghrelin on acid secretion in the rat stomach.
MedLine Citation:
PMID:  20571831     Owner:  NLM     Status:  In-Process    
BACKGROUND: Ghrelin, a growth-hormone-releasing peptide, has two major molecular forms: acylated (acyl) and desacylated (desacyl). Recent studies suggest different roles for these two forms. In the present study, we compared desacyl and acyl ghrelin with regard to acid secretion and histamine production in the rat stomach.
METHODS: We performed in vivo experiments using gastric lumen-perfused rats. The effects of the two forms of ghrelin on gastrin (gastrin-17)-stimulated acid secretion were also examined. Furthermore, to examine the effects of ghrelin on histamine production, histidine decarboxylase messenger ribonucleic acid in the gastric corpus mucosa was measured by reverse transcription-polymerase chain reaction.
RESULTS: Intravenous administration of acyl ghrelin at 20 μg/kg increased gastric acid secretion to 4.8 times greater than control levels. However, desacyl ghrelin had no effect on acid secretion, even at 200 μg/kg. Acyl ghrelin enhanced gastrin-stimulated acid secretion while desacyl ghrelin did not. Vagotomy markedly inhibited the enhancement of gastrin-stimulated acid secretion by acyl ghrelin. Acyl ghrelin increased histidine decarboxylase messenger ribonucleic acid concentration by 2.3 times compared with basal levels at 1 h after administration and by 2.7 times at 2 h after administration; desacyl ghrelin had no such effect. Synergism between acyl ghrelin and gastrin was seen regarding histidine decarboxylase messenger ribonucleic acid concentration.
CONCLUSIONS: The results indicate that acyl ghrelin stimulates gastric acid secretion via a mechanism involving activation of the vagus nerve and histamine release and synthesis and that desacyl ghrelin has no action on gastric acid secretion. Furthermore, the results demonstrate synergism between gastrin and acyl ghrelin in terms of gastric acid secretion via a mechanism involving histamine release and synthesis.
Tomoya Sakurada; Shoki Ro; Tsuneko Onouchi; Shino Ohno; Tohru Aoyama; Katsuya Chinen; Hidehiko Takabayashi; Shingo Kato; Kiyoshige Takayama; Koji Yakabi
Publication Detail:
Type:  Journal Article     Date:  2010-06-23
Journal Detail:
Title:  Journal of gastroenterology     Volume:  45     ISSN:  1435-5922     ISO Abbreviation:  J. Gastroenterol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9430794     Medline TA:  J Gastroenterol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1111-20     Citation Subset:  IM    
Department of Gastroenterology and Hepatology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan.
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