Journal of Lipid Research, Vol. 6, 363-368, July 1965
Copyright © 1965 by Lipid Research, Inc.
Kinetics of linoleic and arachidonic acid incorporation and eicosatrienoic depletion in the lipids of fat-deficient rats fed methyl linoleate and arachidonate
Rodolfo R. Brenner and Anibal M. Nervi
Cátedra de Bioquímica, Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
Changes induced by dietary methyl linoleate and arachidonate in the fatty acid composition of liver phosphatidyl choline, phosphatidyl ethanolamine, cholesterol esters, and triglycerides were investigated in essential fatty acid-deficient rats. The esters were fed for 0, 24, 50, 96, 192, and 360 hr. The lipids were fractionated by thin-layer chromatography and the fatty acid composition was estimated by gas liquid chromatography. Acids bound to the 
'- and ßbeta;-carbons of phosphatides were separated by lipolysis with phospholipase A.
From the compositions found it was deduced that both dietary linoleate and arachidonate inhibited eicosatrienoate synthesis from oleate but that only arachidonate replaced eicosatrienoate quantitatively in the ßbeta;-position of lecithin and cephalin. Both dietary acids displaced some of the ßbeta;-positioned oleate. Monoenoic: saturated acid ratios were also decreased by both esters both in triglycerides and in '-bound acids in phosphatides. In triglycerides this change preceded any significant incorporation of linoleate or arachidonate. Arachidonate effects seemed to be more rapid and more marked than those of linoleate and although final compositions were similar, because of the conversion of linoleate into arachidonate, a different pattern of reactions led to these results.
Supplementary key words kinetics • linoleic • arachidonic • incorporation • eicosatrienoic depletion • liver lipids • rat • choline glycerophosphatides • ethanolamine glycerophosphatides • phospholipase A • triglycerides
Submitted on July 30, 1964
Accepted on February 1, 1965
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