Document Detail


Influence of dietary fat on metabolism of (14-14C)erucic acid in the perfused rat liver. Distribution of metabolites in lipid classes.
MedLine Citation:
PMID:  3736348     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Two groups of rats were fed diets containing 20% by weight of either partially hydrogenated marine oil supplemented with sunflower seed oil (PHMO) or palm oil (PO) for 8 wk. Using a liver perfusion system, the effect of dietary long chain monoenoic fatty acids on the uptake and metabolism of [14-14C]erucic acid was studied. The perfusion times were 15 and 60 min, respectively. The two groups showed equal ability for erucic acid uptake in the liver but differed in the channeling of the fatty acids into various metabolic pathways. A higher metabolic turnover of 22:1 in the PHMO livers relative to the PO livers was demonstrated by an increased recovery of total [14C]labeling in the triglyceride (TG) and phospholipid (PL) fractions, already evident after 15 min of perfusion. The chain-shortening capacity was highest in the PHMO group, reflected by a higher [14C]18:1 incorporation in both TG and PL, and increasing from 15 to 60 min of perfusion. The amount of [14C]18:1 found in PL and TG after 60 min of perfusion of livers from rats fed PO corresponded to that shown for the PHMO group after 15 min. The PL demonstrated a discrimination against 22:1 compared to TG, and, when available, 18:1 was highly preferred for PL-synthesis. The total fatty acid distribution in the TG, as determined by gas liquid chromatography (GLC), reflected the composition of the dietary fats. In the total liver PL, 22:1 and 20:1 were present in negligible amounts, although the PHMO diet contained 12-13% of both 22:1 and 20:1. In the free fatty acid fraction (FFA), the major part of the radioactivity (approximately 80%) was [14-14C]erucic acid, and only small amounts of [14C]18:1 (less than 2%) were present, even after 60 min of perfusion. The shortened-chain 18:1 was readily removed from the FFA pool and preferentially used for lipid esterification.
Authors:
G Hølmer; R Rønneberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Lipids     Volume:  21     ISSN:  0024-4201     ISO Abbreviation:  Lipids     Publication Date:  1986 Jun 
Date Detail:
Created Date:  1986-09-17     Completed Date:  1986-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0060450     Medline TA:  Lipids     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  395-400     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Carbon Radioisotopes
Dietary Fats / pharmacology*
Erucic Acids / metabolism*
Fatty Acids / analysis
Fatty Acids, Unsaturated / metabolism*
Liver / drug effects,  metabolism*
Male
Oils
Perfusion
Rats
Rats, Inbred Strains
Chemical
Reg. No./Substance:
0/Carbon Radioisotopes; 0/Dietary Fats; 0/Erucic Acids; 0/Fatty Acids; 0/Fatty Acids, Unsaturated; 0/Oils; 1072-39-5/erucic acid

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


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