Document Detail

Incorporation of dietary [14C]arachidonic acid and [3H]eicosapentaenoic acid into tissue lipids during absorption of a fish oil emulsion.
MedLine Citation:
PMID:  1402398     Owner:  NLM     Status:  MEDLINE    
A preferential incorporation of dietary arachidonic acid (20:4, n-6) into chyle lipoprotein phospholipids, a relative resistance of 20:4 esters of chyle triacylglycerol (TG) to hydrolysis by lipoprotein lipase, a preferential utilization of 20:4 for phospholipid acylation, and a low rate of oxidation of 20:4 are factors that may contribute to the differences seen in the incorporation into tissue lipids between absorbed 20:4 and the predominant dietary 16-18 carbon fatty acids. In this study we fed [14C]20:4 and [3H]eicosapentaenoic acid (20:5, n-3) as free fatty acids in a fish oil emulsion to rats and analyzed the radioactivity in different tissue lipids after 1, 2, and 4 h. The purpose was to examine the degree of similarity in the fate of the two major eicosanoid precursors during the absorption of a fish oil meal. The recovery after 2 and 4 h of 14C exceeded that of 3H in lipids of small intestine, serum, liver, heart, kidneys, and spleen. The differences increased with time, e.g., the liver contained 9.7 (+/- 0.7)% 3H and 17.9 (+/- 1.4)% of the 14C (P less than 0.001), and the upper half of the small intestine 10.0 (+/- 0.8)% of the 3H and 22.8 (+/- 1.1)% of the 14C (P less than 0.001) after 4 h. The 14C and 3H radioactivity per g tissue after 4 h ranked as follows: liver and brown adipose tissue greater than kidneys greater than heart, lungs, spleen, and serum greater than colon greater than white adipose tissue and testes, the differences between tissues being up to 50-fold. There were up to fourfold variations in the 14C/3H ratios between tissues after 4 h, the highest value being observed in the heart and the lowest in white adipose tissue. Of the radioactivity retained in liver and intestine, more 14C and 3H was in phospholipids and less in triacylglycerol (TG), the differences being largest in the liver, e.g., after 4 h 57.6 (+/- 0.8)% of the 14C and 29.9 (+/- 0.9)% of the 3H (P less than 0.001) in the liver was in phosphatidylcholine (PC). In both intestine and liver the highest 14C/3H ratios were found in phosphatidylinositiol (PI). Also phosphatidylethanolamine (PE) contained more 14C than 3H but the quantitative differences were relatively small after 4 h. In heart the proportions of 3H and 14C found in PE and PI did not differ, whereas more of the 14C was in PC and more of the 3H was in cardiolipin and phosphatidylserine.(ABSTRACT TRUNCATED AT 400 WORDS)
A Nilsson; L Hjelte; B Strandvik
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of lipid research     Volume:  33     ISSN:  0022-2275     ISO Abbreviation:  J. Lipid Res.     Publication Date:  1992 Sep 
Date Detail:
Created Date:  1992-10-26     Completed Date:  1992-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376606     Medline TA:  J Lipid Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1295-305     Citation Subset:  IM    
Department of Medicine, University of Lund, Sweden.
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MeSH Terms
Arachidonic Acid / metabolism*,  pharmacokinetics
Carbon Radioisotopes
Dietary Fats / metabolism*
Eicosapentaenoic Acid / metabolism*,  pharmacokinetics
Fatty Acids / metabolism
Fish Oils / metabolism*
Intestinal Absorption
Intestines / metabolism
Lipid Metabolism*
Liver / metabolism
Myocardium / metabolism
Organ Specificity
Phosphatidylcholines / metabolism
Phosphatidylinositols / metabolism
Plasmalogens / metabolism
Rats, Sprague-Dawley
Triglycerides / metabolism
Reg. No./Substance:
0/Carbon Radioisotopes; 0/Dietary Fats; 0/Emulsions; 0/Fatty Acids; 0/Fish Oils; 0/Phosphatidylcholines; 0/Phosphatidylinositols; 0/Plasmalogens; 0/Triglycerides; 1553-41-9/Eicosapentaenoic Acid; 506-32-1/Arachidonic Acid

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