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Journal of Lipid Research, Vol 25, 799-804, Copyright © 1984 by Lipid Research, Inc.

ARTICLES

Hepatic uptake of chylomicrons and triglyceride emulsions in rats fed diets of differing fat content

WJ Kortz, BD Schirmer, CM Mansbach 2d, F Shelburne, MR Toglia and SH Quarfordt

The hepatic removal of plasma chylomicrons was determined for rats fed the following diets: a) containing no triglyceride, b) regular chow diet with 4.5% of its mass as lipid and, c) a corn oil-supplemented chow with triglyceride accounting for 20% of the mass. The fractional hepatic uptake of either radiolabeled chylomicrons or a triglyceride emulsion was reciprocally related to the amount of lipid in the diet. The animals receiving only carbohydrate and protein calories had the most active hepatic uptake of particulate triglyceride and were observed to have a significant decrease in the plasma concentration of the C apolipoproteins. The addition of either C-I, C-II, or C-III apoproteins to the triglyceride emulsion prior to intravenous injection produced a significantly lower hepatic triglyceride recovery of emulsions containing apoC-III. When the plasma of animals fed a fat- free diet was supplemented with human C-III-1 apolipoprotein, the distribution into the liver of either enterally administered fatty acid or parenteral triglyceride was diminished. The triglyceride content in the liver of the rats fed fat-free or corn oil-supplemented diets was significantly greater than that of the control rats and composition was somewhat similar to that of lymph triglyceride. The studies indicate an important influence of dietary lipid on both the partition of plasma triglyceride into the liver and the steady state hepatic triglyceride content.
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