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Journal of Lipid Research, Vol 34, 1423-1434, Copyright © 1993 by Lipid Research, Inc.

ARTICLES

Modification of spleen phospholipid fatty acid composition by dietary fish oil and by n-3 fatty acid ethyl esters

DR Robinson, LL Xu, CT Knoell, S Tateno and W Olesiak
Arthritis Unit, Massachusetts General Hospital, Boston.

We have compared the effects of diets containing purified ethyl esters of either eicosapentaenoic acid, docosahexaenoic acid, or a mixture of both of these compounds, with diets containing either purified fish oil or beef tallow on spleen phospholipid fatty acid composition. Autoimmune mice, the (NZB x NZW)F1 strain, were fed with experimental diets for 14 weeks, after which spleen phospholipids were extracted and separated into classes by HPLC, and the alkenylacyl, alkylacyl, and diacyl subclasses of glycerylphosphatidylethanolamine and glycerylphosphatidylcholine were resolved as their benzoyl esters by HPLC. Fatty acids were analyzed by capillary gas-liquid chromatography of their methyl esters. Each of the marine lipid diets suppressed n-6 fatty acids and elevated n-3 fatty acids in all phospholipids. The eicosapentaenoic acid ethyl ester diets led to high levels of eicosapentaenoic acid and docosapentaenoic acid (C22:5n-3), but little or no increase in docosahexaenoic acid. The docosahexaenoic acid ethyl ester diets elevated docosahexaenoic acid, docosapentaenoic acid, and eicosapentaenoic acid in all phospholipids, indicating that extensive retroconversion of 22 carbon n-3 fatty acids had occurred. These results document changes in the fatty acid composition of mammalian phospholipids that are induced by dietary fish oil triglycerides and by dietary long chain n-3 fatty acid ethyl esters.
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