Document Detail


Glucocorticoids and parental hyperphagia in ring doves (Streptopelia risoria).
MedLine Citation:
PMID:  11863379     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
These studies explored the possibility that glucocorticoids promote parental care in ring doves by mediating, at least in part, the pronounced increase in food consumption that parent doves exhibit while provisioning their young. Plasma concentrations of the endogenous glucocorticoid corticosterone were found to be significantly higher in breeding females during the posthatching phase than during the incubation period. These differences were not observed in male breeding partners, but sex differences in daily activity rhythms are well documented in breeding doves, and blood sampling at different times of day would be required to adequately characterize the pattern of corticosterone in males during these breeding stages. In studies on nonbreeding doves, twice-daily intracerebroventricular (icv) injections of the synthetic glucocorticoid dexamethasone (DEX) increased food intake by 25-50% in both sexes, and further studies in males revealed that the increase was directly related to the dose of DEX administered. The highest dose of DEX given icv (1.0 microg/day) was not effective in stimulating feeding when given systemically, thereby suggesting that the hyperphagic action of DEX is exerted directly on the central nervous system. The icv infusion of the selective glucocorticoid receptor antagonist RU38486 blocked the hyperphagic effects of twice-daily icv injections of DEX in both sexes. Collectively, these data support the hypothesis that corticosterone contributes to the parental hyperphagia exhibited by breeding doves during the posthatching period. They also suggest that these orexigenic effects are mediated in part by CNS binding sites that resemble mammalian glucocorticoid receptors.
Authors:
Kristin A Koch; John C Wingfield; John D Buntin
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hormones and behavior     Volume:  41     ISSN:  0018-506X     ISO Abbreviation:  Horm Behav     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-02-26     Completed Date:  2002-05-01     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0217764     Medline TA:  Horm Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9-21     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 5320l, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Weight / drug effects
Columbidae / physiology*
Corticosterone / blood
Dexamethasone / pharmacology*
Dose-Response Relationship, Drug
Eating / drug effects
Female
Glucocorticoids / pharmacology*
Hormone Antagonists / pharmacology
Hyperphagia / chemically induced*,  physiopathology*
Injections, Intramuscular
Injections, Intraventricular
Male
Mifepristone / pharmacology
Nesting Behavior / drug effects
Grant Support
ID/Acronym/Agency:
MH41447/MH/NIMH NIH HHS
Chemical
Reg. No./Substance:
0/Glucocorticoids; 0/Hormone Antagonists; 50-02-2/Dexamethasone; 50-22-6/Corticosterone; 84371-65-3/Mifepristone

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


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