Abnormalities of high density lipoproteins in abetalipoproteinemia

The Journal of Clinical Investigation
J W Jones, P O Ways

Abstract

DETAILED STUDIES OF THE HIGH DENSITY LIPOPROTEINS FROM THREE PATIENTS WITH ABETALIPOPROTEINEMIA HAVE REVEALED THE FOLLOWING PRINCIPAL ABNORMALITIES: 1) High density lipoprotein 3 (HDL3) is reduced in both absolute and relative concentration, although HDL2 is present in normal amounts. 2) The phospholipid distribution of both HDL fractions is abnormal, with low concentrations of lecithin and an increased percentage (though normal absolute quantity) of sphingomyelin. 3) In both HDL fractions, lecithin contains less linoleate and more oleate than normal. The cholesteryl esters are also low in linoleic acid, and the sphingomyelin is high in nervonic acid. Dietary intake influences the linoleic acid concentration within 2 weeks, and perhaps sooner, but the elevated sphingomyelin nervonic acid is little affected by up to 6 months of corn oil supplementation. Qualitatively similar changes in fatty acid composition, but not phospholipid distribution, are also found in other malabsorption states. The available evidence suggests that the abnormally low levels of HDL3 and the deranged phospholipid distribution are more specific for abetalipoproteinemia than the fatty acid abnormalities. However, the absence of these abnormalities in oblig...Continue Reading

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