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Distribution of cholesteryl esters and other lipid in subcellular fractions of the adrenal gland of the pig

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Lipids

Abstract

Total lipids from whole pig adrenal glands as well as from their mitochondria, microsomes, liposomes, and cell sap were extracted and fractionated first into neutral lipids and phospholipids. The highest percentage of neutral lipids was found in the cell sap, and the lowest in the microsomal fraction. Neutral lipids were subfractionated into cholesteryl esters, free cholesterol, triglycerides, and free fatty acids. Cholesteryl esters were distributed throughout the liposomes. Free fatty acids represented a substantial part of cell sap lipids, but were present also in the mitochondria, microsomes, and liposomes. Fatty acids of all fractions were analyzed by gas liquid chromatography. Free fatty acids and cholesteryl ester fatty acids from all cellular fractions were similar in composition and were characterized by considerable quantities of linoleic and arachidonic acid. Triglycerides were characterized by an increased percentage of palmitic and a low content of arachidonic acid. Phosphatidyl choline, phosphatidyl ethanolamine, diphosphatidyl glycerol, and sphingomyelin plus phosphatidyl inositol were isolated from the lipids by preparative thin layer chromatography, and their fatty acids analyzed by gas liquid chromatography. Phosphatidyl choline and phosphatidyl ethanolamine from mitochondria, microsomes, and cell sap were very similar in respect of their fatty acid composition. Sphingomyelin plus phosphatidyl inositol was characterized by a high content of C22:2ω6. Diphosphatidyl glycerol was present in mitochondria and in the cell sap.

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Authors and Affiliations

  1. Department of Biochemistry, University of Rhodesia, Salisbury, Rhodesia

    S. H. W. Cmelik & H. Ley

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  1. S. H. W. Cmelik
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  2. H. Ley
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Cmelik, S.H.W., Ley, H. Distribution of cholesteryl esters and other lipid in subcellular fractions of the adrenal gland of the pig. Lipids 10, 707–713 (1975). https://doi.org/10.1007/BF02532765

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  • DOI: https://doi.org/10.1007/BF02532765

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