[Correlation and composition of the plasmalogen and diacyl forms of phosphatidylethanolamine in subcellular brain fractions of the trout Salmo irideus and the frog Rana temporaria].

In myelin, nuclear, microsomal, mitochondrial and synaptosomal fractions from the brain of the trout and frog, studies have been made on the composition of fatty acids and fatty aldehydes of the plasmalogen form and fatty acids of the diacylic form of phosphatidylethanolamin. It was shown that alongside with the increase of the relative content of the plasmalogen form of phosphatidylethanolamin in subcellular fractions of the brain in the frog, especially in the myelin, changes also take place in the composition of fatty acids (the increase in the content of polyenic acids, especially of arachidonic one) and fatty aldehydes (the increase in the degree of unsaturation). Brain myelin of coldblooded vertebrates exhibits similarity with myelin from higher vertebrates in its high content of plasmalogens with a high degree of unsaturation of fatty acids and fatty aldehydes.