Document Detail


The majority of dietary linoleate in growing rats is beta-oxidized or stored in visceral fat.
MedLine Citation:
PMID:  9040558     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
On a quantitative, whole-body basis, little is known about the amount of linoleate that is converted to arachidonate or the partitioning of linoleate and its longer-chain derivatives among lean and fat tissues. The aim of the present study was to examine linoleate balance and organ partitioning in rats consuming a low but adequate level of linoleate. Weanling male Sprague-Dawley rats were given free access to a semipurified diet containing 2.3% of energy as linoleate. Food intake, fecal output and body weight gain were measured for 26 d. Whole-body fatty acid balance analysis showed that 75.5% of the linoleate consumed disappeared (apparently by beta-oxidation), 18.7% was accumulated as linoleate, 3.0% was converted to (n-6) longer-chain polyunsaturated fatty acids, and 1.2% was excreted in the feces Visceral fat contained 64% of the accumulated linoleate, and 23% was in lean tissues. Comparable values for alpha-linolenate were as follows: disappearance (84.9%), accumulation (10.9%), excretion in the feces (2.2%), and conversion to (n-3) longer-chain polyunsaturated fatty acids (1.4%). Visceral fat contained 67% of the accumulated alpha-linolenate, and 23% was in lean tissues. Visceral fat also accumulated 26% of newly synthesized (n-6) longer-chain polyunsaturated fatty acids and 31% of the (n-3) longer-chain polyunsaturated fatty acids. Thus, only 6.5% of dietary linoleate consumed at a low but adequate level for rats appeared in lean tissues as linoleate or its fatty acid metabolites; the rest was beta-oxidized or stored in fat, mostly in visceral fat. These results lead us to speculate whether losses through beta-oxidation contribute to the recommended intake for linoleate in growing rats.
Authors:
S C Cunnane; M J Anderson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of nutrition     Volume:  127     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  1997 Jan 
Date Detail:
Created Date:  1997-03-19     Completed Date:  1997-03-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  146-52     Citation Subset:  IM    
Affiliation:
Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adipose Tissue / metabolism*
Animals
Body Weight / drug effects
Diet
Fatty Acids, Unsaturated / metabolism
Linoleic Acids / metabolism*,  pharmacokinetics*
Male
Oxidation-Reduction
Rats
Rats, Sprague-Dawley
Tissue Distribution
Chemical
Reg. No./Substance:
0/Fatty Acids, Unsaturated; 0/Linoleic Acids

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


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