Document Detail

Hormones and metabolites of arctic foxes (Alopex lagopus) in response to season, starvation and re-feeding.
MedLine Citation:
PMID:  10936768     Owner:  NLM     Status:  MEDLINE    
Svalbard's arctic foxes experience large seasonal variations in light, temperature and food supply throughout the year, which may result in periods of starvation. The aim of this work is to investigate if there are seasonal variations in post-absorptive plasma thyroid hormones (free thyroxin (fT(4)), free triiodothyronine (fT(3)) and reverse triiodothyronine (rT(3))) and metabolites (free fatty-acids (FFA) and beta-hydroxybutyrate (beta-OHB)) with season and their response to starvation and re-feeding. The concentrations of post-absorptive free triiodothyronine were significantly higher in November than May, while those of thyroxin, reverse triiodothyronine, free fatty-acids and beta-hydroxybutyrate remained unchanged. Possible explanations for the seasonal variations in free triiodothyronine are discussed. There were no significant changes from post-absorptive concentrations of thyroxin and reverse triiodothyronine in starved and re-fed foxes. However, free triiodothyronine concentrations decreased during starvation and increased again with re-feeding both in May and November. Starvation induced high levels of free fatty acids in both May and November, indicating increased lipolysis. There was a significant increase in beta-hydroxybutyrate in November only, indicating that arctic foxes are capable of protein conservation during starvation.
E Fuglei; M Aanestad; J P Berg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  126     ISSN:  1095-6433     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-09-29     Completed Date:  2000-09-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  287-94     Citation Subset:  IM    
Norwegian Polar Institute, N-9296, Tromso, Norway.
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MeSH Terms
3-Hydroxybutyric Acid / blood
Arctic Regions
Fatty Acids, Nonesterified / blood
Foxes / physiology*
Thyroid Hormones / blood*
Reg. No./Substance:
0/Fatty Acids, Nonesterified; 0/Thyroid Hormones; 300-85-6/3-Hydroxybutyric Acid

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