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Very-low-density lipoprotein (VLDL), labelled in vivo with [9,10-3H]oleate, was taken up rapidly by liver after injection in vivo. Initially, radioactive lipoprotein remnants in the VLDL density range were present in liver as a bound extracellular pool that could be released by perfusion with polyphosphate or heparin. The bound remnant showed a decrease in mean diameter and an increased proportion of cholesteryl ester as a function of time after injection. When VLDL of different mean diameters was injected, it was found that: (1) total uptake by liver was independent of diameter; (2) small VLDL was not taken up more rapidly than large VLDL; and (3) Large VLDL lost no more triacylglycerol before binding than did small VLDL and larger species of mean diameter greater than 40 nm were bound. It is concluded that there is no unique VLDL remnant taken up by liver in vivo. When livers were perfused after binding radioactive VLDL in vivo, the lipoprotein was metabolized, with the production of water-soluble products, and this metabolism was inhibited by chloroquine.

Heterogeneity of very-low-density lipoprotein remnants bound and taken up by liver of starved rat in vivo