Abstract
Plasma lipids, apoprotein A-I and B in serum and in lipoprotein fractions (VLDL + LDL, HDL2, and HDL3) obtained by preparative ultracentrifugation, as well as postheparin lipoprotein lipase activity (H-TGL and LPL) were evaluated in 17 subjects with primary biliary cirrhosis (stage II and III) subdivided into two groups according to the presence or absence of lipoprotein X (Lp-X). A reduction in total lipoprotein lipase activity was observed in both patient groups, compared to controls (P<0.01); the hepatic lipoprotein lipase was significantly reduced (P<0.01) only in the Lp-X-positive group. The lipid (477.8+154.3 vs 239.6±51.1; P<0.01) and protein (147.4±37.1 vs 83.3±19.7; P< 0.01) masses in the VLDL + LDL fraction of the Lp-X-positive group were increased compared to controls. In the same group, the HDL2 fraction also showed an increase in lipid (186.6±80.0 vs 77.9±21.6; P<0.01) and protein (133.9±60.0 vs 67.9±16.5; P <0.01) masses; in addition, the HDL2 percent lipid composition was different in the two patient groups, showing a decrease in esterified cholesterol (20.4±3.6 vs 25.7±2.2; P <0.01) and an increase in phospholipids (59.2±2.9 vs 54.8±2.6; p<0.01) in the Lp-X-positive group. Apo B was also increased in Lp-X-positive patients both in the serum (134.0±27.6 vs 90.9±7.3; P<0.01) and in the VLDL + LDL fraction (134.0±22.2 vs 72.5±16.5; P<0.01). The differences seen in lipoprotein concentration and composition in the two patient groups seem related, in part, to the presence of Lp-X or, better, to the stage of the disease. The reduction in hepatic lipase may play an important role in determining the increase and altered composition of the HDL2 subfraction.
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Baldo-Enzi, G., Baiocchi, M.R., Grotto, M. et al. Lipoprotein pattern and plasma lipoprotein lipase activities in patients with primary biliary cirrhosis. Digest Dis Sci 33, 1201–1207 (1988). https://doi.org/10.1007/BF01536666
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DOI: https://doi.org/10.1007/BF01536666