Characterization of very-low-density lipoproteins isolated from baboons, and fractionated using heparin-Sepharose chromatography

David L. Rainwater, Rampratap S. Kushwaha

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    4 Scopus citations

    Abstract

    Plasma very-low-density lipoproteins (VLDL) (d< 1.006 g/ml) were purified from baboons by repeated ultracentrifugation. The weight composition of VLDL purified from these animals was 59% triacylglycerol, 17% phospholipid, 13% cholesterol plus cholesteryl esters, and 11% protein. When purified VLDL was fractionated using heparin-Sepharose chromatography, an average of 33% of the total recovered proteins were unbound in a saline solution, and 67% (range, 31 to 92%) were bound by the column, but could be eluted with 3 M NaCl. Recoveries of starting protein and the major classes of lipids in the two fractions were 70-80%. The two fractions differed in both apolipoprotein and lipid compositions. Analysis of sodium dodecyl sulfate-treated apolipoproteins using 3-21.5% acrylamide gradient gel electrophoresis indicated that both VLDL fractions contained apolipoprotein B, but only the bound fraction possessed significant amounts of apolipoprotein E. On a weight percent basis, the apolipoprotein-E-rich (bound) VLDL fraction contained significantly more cholesterol and cholesteryl esters (P < 0.001) and less phospholipids (P < 0.005) compared to the apolipoprotein E-poor (unbound) VLDL. Apolipoprotein-E-poor VLDL had shorter retention times than E-rich VLDL upon gel filtration chromatography, suggesting a larger size. There was no significant correlation between plasma levels of apolipoprotein-E-poor VLDL and levels of apolipoprotein B. These results demonstrate that baboons possess VLDL which can be separated into apolipoprotein-E-poor and E-rich fractions and these fractions differ in protein and lipid composition and in size.

    Original languageEnglish (US)
    Pages (from-to)416-423
    Number of pages8
    JournalBiochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism
    Volume958
    Issue number3
    DOIs
    StatePublished - Feb 19 1988

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    Keywords

    • (Baboon)
    • Apolipoprotein E
    • Heparin-Sepharose
    • Lipoprotein
    • VLDL

    ASJC Scopus subject areas

    • Biophysics
    • Biochemistry
    • Endocrinology

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