Document Detail


Centrally and peripherally administered ghrelin potently inhibits water intake in rats.
MedLine Citation:
PMID:  17255209     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Ghrelin is known as a potent orexigenic hormone through its action on the brain. In this study, we examined the effects of intracerebroventricular (icv) and iv injection of ghrelin on water intake, food intake, and urine volume in rats deprived of water for 24 h. Water intake that occurred after water deprivation was significantly inhibited by icv injection of ghrelin (0.1, 1, and 10 nmol/rat) in a dose-related manner, although food intake was stimulated by the hormone. The antidipsogenic effect was as potent as the orexigenic effect. Similarly, water intake was inhibited, whereas food intake was stimulated dose dependently after iv injection of ghrelin (0.1, 1, and 10 nmol/kg). The inhibition of drinking was comparable with, or even more potent than, atrial natriuretic peptide (ANP), an established antidipsogenic hormone, when administered icv, although the antidipsogenic effect lasted longer. ANP had no effect on food intake. Urine volume decreased dose relatedly after icv injection of ghrelin but not by ANP. Intravenous injection of ghrelin had no effect on urine volume. Because drinking usually occurs with feeding, food was withdrawn to remove the prandial drinking. Then the antidipsogenic effect of ghrelin became more potent than that of ANP and continued longer than when food was available. Expression of Fos was increased in the area postrema and the nucleus of the tractus solitarius by using immunohistochemistry after icv and iv injection of ghrelin. The present study convincingly showed that ghrelin is a potent antidisogenic peptide in rats.
Authors:
Hirofumi Hashimoto; Hiroaki Fujihara; Makoto Kawasaki; Takeshi Saito; Minori Shibata; Hiroki Otsubo; Yoshio Takei; Yoichi Ueta
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-25
Journal Detail:
Title:  Endocrinology     Volume:  148     ISSN:  0013-7227     ISO Abbreviation:  Endocrinology     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-19     Completed Date:  2007-04-24     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0375040     Medline TA:  Endocrinology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1638-47     Citation Subset:  AIM; IM    
Affiliation:
Department of Physiology, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan.
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MeSH Terms
Descriptor/Qualifier:
Animals
Brain / drug effects,  metabolism
Dose-Response Relationship, Drug
Drinking / drug effects*
Eating / drug effects
Ghrelin
Injections, Intravenous
Injections, Intraventricular
Male
Peptide Hormones / administration & dosage*
Proto-Oncogene Proteins c-fos / metabolism
Rats
Rats, Wistar
Time Factors
Urine
Chemical
Reg. No./Substance:
0/Ghrelin; 0/Peptide Hormones; 0/Proto-Oncogene Proteins c-fos

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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