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Effect of total parenteral nutrition with linoleic acid‐rich emulsions on tissue ω6 and ω3 fatty acids in the rat
Author(s) -
Innis Sheila M.
Publication year - 1986
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02534434
Subject(s) - lipidology , clinical chemistry , clinical nutrition , parenteral nutrition , linoleic acid , food science , chemistry , fatty acid , polyunsaturated fatty acid , biochemistry , biology , medicine , endocrinology
The effect of total parenteral nutrition (TPN) with lipid emulsions containing ca. 48% 18∶2ω6 plus 8% 18∶3ω3 (Intralipid ® ) or 76% 18∶2ω6 plus 0.5% 18∶3ω3 (Liposyn ® ) on the fatty acid composition of liver and plasma triglyceride and phospholipid (PL) was studied in the rat. Plasma PL showed a clear influence of the egg PL present in the infused lipid, suggesting replacement of endogenous lipoprotein PL. The incorporation of 20 and 22 carbon ω6 and ω3 fatty acids was reduced in liver phosphatidylcholine of rats infused with either Intralipid or Liposyn. Phosphatidylethanolamine was much less affected and showed reduced 20∶4ω6 and 20∶5ω3 in the Liposyn group only. Reduction in levels of long chain essential fatty acid metabolites was compensated for by an increased content of saturated fatty acids. There was no accumulation of 18∶2ω6 or 18∶3ω3 in liver PL. The similarity between the effects of Intralipid and Liposyn supports the conclusion that 18∶2ω6, not 18∶3ω3, was responsible. The data suggest that intravenous administration of high levels of 18∶2ω6 in parenteral lipid reduces desaturation/elongation of essential fatty acids but does not competitively inhibit esterification of other fatty acids into PL.