Apolipoprotein E-enriched lipoprotein subclasses in normolipidemic subjects

J. C. Gibson, A. Rubinstein, P. R. Bukberg, W. V. Brown

Research output: Contribution to journalArticlepeer-review

Abstract

This study was undertaken to objectively define the lipoprotein association of apoE without ultracentrifugation and represents a description of three distinct apoE-containing lipoprotein (LP) subclasses in normal human plasma. The lipoproteins of whole plasma were fractionated in a continuous manner by molecular sieve chromatography using 4% agarose and the elution profile of apoE was compared to that of apoB, apoA-I, cholesterol, and triglyceride. The data show that all apoE in normal subjects is LP-associated and is confined to three discrete LP subfractions of characteristic size. The largest (fraction I), appears to be a subclass of very low density lipoproteins (VLDL). The other two, however, are distinct in size from the major cholesterol-carrying LP; fraction II is intermediate in size between VLDL and the major apoB-containing lipoprotein LDL; and fraction III is larger than the major apoA-I-containing lipoproteins, HDL, but smaller than LDL. Parallel chromatography supernatant supernantant and infranatant fractions obtained after ultracentrifugation of serum at each of three different densities, 1.006, 1.019, and 1.063 g/ml confirmed that fraction I is of density less than 1.006 g/ml, but that fractions II and III overlap the conventional density intervals.

Original languageEnglish
Pages (from-to)886-898
Number of pages13
JournalJournal of Lipid Research
Volume24
Issue number7
StatePublished - 1983
Externally publishedYes

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