J. Lipid Res.
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Journal of Lipid Research, Vol 24, 731-736, Copyright © 1983 by Lipid Research, Inc.

ARTICLES

Apolipoprotein A-I isoforms in human lymph: effect of fat absorption

G Ghiselli, EJ Schaefer, JA Light and HB Brewer Jr

The effect of fat feeding (100 g of cream) on the apoA-I isoproteins distribution has been analyzed by two-dimensional gel electrophoresis in the chylomicrons, VLDL, LDL, and HDL isolated from the thoracic duct lymph of patients undergoing lymph drainage for immunosuppression, Isoforms apoA-I3 and apoA-I4 are the most abundant apoA-I isoproteins in plasma lipoproteins as well as in lymph lipoproteins collected in the fasting state. Fat feeding, on the other hand, results in a marked change in the apoA-I isoform pattern in lymph chylomicrons and VLDL, with a significant increase in the relative concentration of the apoA- I1 isoform. As a result the total concentration of this isoprotein in the lymph increased. The data indicate that fat feeding is associated with major changes in the distribution of the apoA-I isoforms in the lymph (d less than 1.006 g/ml lipoproteins), which may be of significance in their plasma catabolism.
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Copyright © 1983 by the American Society for Biochemistry and Molecular Biology.