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Capillary isotachophoresis study of lipoprotein network sensitive to apolipoprotein E phenotype. 1. ApoE distribution between lipoproteins

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Abstract

Sixteen patients differing widely in plasma triglyceride content were divided into three groups by their apolipoprotein E (apoE) phenotype—E33 homozygotes, E23, and E34 heterozygotes. The plasma lipid and apoE distribution between individual lipoproteins was followed by capillary isotachophoresis (CITP) of plasma samples pre-stained with lipid fluorescent probe NBD-C6-ceramide and by fluorescein-labeled apoE, respectively. Among 12 peaks visualized by ceramide staining, an individual peak with very low density lipoproteins (VLDL) was identified. The VLDL cholesterol and apoE content determined by CITP directly in whole plasma were significantly related to their content as determined by conventional analysis with isolated VLDL. The ceramide distribution among lipoprotein pools was insensitive to apoE phenotype (49–53 : 7–11 : 39–43% for HDL, VLDL, and IDL/LDL, respectively) while the preferential binding of apoE to VLDL was observed in E34 patients compared to E33 (62 : 19 : 20 vs. 70 : 9 : 22%). In a study of apoE/F displacement from lipoproteins at plasma titration by apoC-III in vitro, apoE was found to bind more tightly to VLDL from E34 compared to E33 patients as evidenced by both the increased non-displaceable apoE pool, the increased VLDL sorbtion capacity for apoE, and the decreased displacement parameter in a “container” model of lipoprotein binding. Two different types of apoE package in a whole lipoprotein profile were observed. ApoE structure in a particular lipoprotein may underlie the phenotype-sensitive apoE distribution and apoC-III interference in hypertriglyceridemia.

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Acknowledgments

A.D.D. thanks the Russian Foundation for Basic Research for financial support, grant 07-04-00377.

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Authors and Affiliations

  1. National Research Centre for Preventive Medicine, 10, Petroverigsky street, 101990, Moscow, Russia

    Alexander D. Dergunov & Maxim V. Mel’kin

  2. Faculte de Pharmacie, INSERM U525 - Equipe 4, EA 4003, Université Henri Poincaré, 30 rue Lionnois, 54000, Nancy, France

    Anne Ponthieux, Daniel Lambert, Sophie Visvikis-Siest & Gerard Siest

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  1. Alexander D. Dergunov
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Correspondence to Alexander D. Dergunov.

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Dergunov, A.D., Ponthieux, A., Mel’kin, M.V. et al. Capillary isotachophoresis study of lipoprotein network sensitive to apolipoprotein E phenotype. 1. ApoE distribution between lipoproteins. Mol Cell Biochem 325, 41–51 (2009). https://doi.org/10.1007/s11010-008-0018-9

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