Abstract
Rat hepatocytes in monolayer cultures take up and degrade cholesteryl ester of isolated chylomicron remnants. The cholesteryl ester of native chylomicrons was metabolized at a slower rate. The uptake of cholesteryl ester was decreased by the presence of serum. The hydrolysis of cholesteryl ester but not the uptake or binding of chylomicron remnants by the cells was inhibited by chloroquine, which is known to inhibit the lysosomal degradation of protein and of low density lipoproteins by fibroblasts. Colchicine, which inhibits the hydrolysis of chylomicron cholesteryl ester after the uptake by the liver in vivo, had the same effect in hepatocyte monolayers.
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