Isolation and characterization of lipoprotein-X from the pig

In vitro incubation of pig bile with pig whole serum resulted in the formation of "LP-X like" material migrating towards the cathode on agar-gel electrophoresis. As in all other species studied so far, LP-X occurred also in the serum of bile duct ligated pigs, however, relatively late (48-72h) after the operation. In parallel, alterations of some serum parameters and of the protein-lipid composition of the different lipoporotein fractions were observed. While the electrophoretic behaviour, the protein-lipid and apoprotein composition of pig LP-X were comparable to those found in man, dog and rat, it sedimated in most instances at the density 1.063 g/ml.