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Remnants of Lipoproteins of Intestinal and Hepatic Origin in Familial Dysbetalipoproteinemia

We used the low molecular weight form of apolipoprotein B (B-48) as a marker for the identification of remnant particles formed from chyiomicrons in the plasma of patients with familial dysbetalipoproteinemia. In the serum of patients fasted 14 hours, the d < 1.006 g/cm3 lipoproteins of prebeta mobility, separated by starch block electrophoresis, contained only the primary hepatogenous species of apolipoprotein B (B-100), and their llpld composition resembled that of normal prebeta very low density lipoproteins. In contrast, the fraction with beta mobility contained both the B-48 and B-100 proteins; the B-48 protein was found primarily among the largest particles. All fractions of beta mobility were greatly enriched with choiesteryi esters. The beta fraction thus contains remnant particles which appear to originate both from chyiomicrons and hepatogenous very low density lipoproteins. It appears that these remnant particles share a common removal mechanism which is impaired in familial dysbetalipoproteinemia.