Document Detail

Physiological constraint on feeding behavior: intestinal membrane disaccharidases of the starling.
MedLine Citation:
PMID:  2916126     Owner:  NLM     Status:  MEDLINE    
Animals clearly choose what they eat and can even choose among chemically different sugars. The physiological and biochemical mechanisms that constrain feeding choices are largely unknown. In this study, European starlings (Sturnus vulgaris) preferred mixture solutions of D-glucose plus D-fructose to equimolar (double molar caloric value) solutions of sucrose. Intubation feeding of sucrose did not increase blood glucose levels. Sucrose is a useless energy source for these birds because they lack a single digestive enzyme (sucrase) on the small intestinal brush border membrane. However, the membranes possessed separate maltase and isomaltase disaccharidases. This expression pattern and expression patterns of membrane disaccharidases among mammals suggest a role for intestinal enzymes in the coevolutionary interactions between vertebrates and their plant food sources.
C Martinez del Rio; B R Stevens
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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:  Science (New York, N.Y.)     Volume:  243     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-03-14     Completed Date:  1989-03-14     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  794-6     Citation Subset:  IM    
Department of Zoology, University of Florida, Gainesville 32611.
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MeSH Terms
Birds / physiology*
Disaccharidases / physiology
Disaccharides / metabolism
Feeding Behavior / physiology*
Intestinal Mucosa / enzymology
Intestines / physiology*
Microvilli / enzymology
Sucrase / metabolism
Grant Support
Reg. No./Substance:
0/Disaccharides; EC 3.2.1.-/Disaccharidases; EC

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

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