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(Arteriosclerosis, Thrombosis, and Vascular Biology. 1995;15:1359-1368.)
© 1995 American Heart Association, Inc.

Articles

Pravastatin Modulates Cholesteryl Ester Transfer From HDL to ApoB-Containing Lipoproteins and Lipoprotein Subspecies Profile in Familial Hypercholesterolemia

Maryse Guérin; Peter J. Dolphin; Corinne Talussot; Jean Gardette; François Berthézène; M. John Chapman

From the Institut National de la Santé et de la Recherche Médicale, Unité 321, Pavillon Benjamin Delessert, Hôpital de la Pitié (M.G., M.J.C.), Rhône-Poulenc Rorer, Division Spécia, Paris (J.G.), Laboratoire du Métabolisme des Lipides, Institut National de la Santé et de la Recherche Médicale, Unité 63, Hôpital de l'Antiquaille, Lyon, France (C.T., F.B.), and The Lipoprotein Group, Department of Biochemistry, Dalhousie University, Halifax, Nova Scotia, Canada (P.J.D.).

Correspondence to Dr Maryse Guérin, INSERM U 321, Pavillion Benjamin Delessert, Hôpital de la Pitié, 83 Boulevard de l'Hôpital, 75651 Paris Cedex 13, France.

Abstract Familial hypercholesterolemia (FH) results from genetic defects in the LDL receptor, and is characterized by a marked elevation in plasma LDL and by qualitative abnormalities in LDL particles. Because LDL particles are major acceptors of cholesteryl esters (CEs) from HDL, significant changes occur in the flux of CE through the reverse cholesterol pathway. To evaluate the effects of an HMG-CoA reductase inhibitor, pravastatin, on CE transfer from HDL to apo B–containing lipoproteins and on plasma lipoprotein subspecies profile in subjects with heterozygous FH, we investigated the transfer of HDL-CE to LDL subfractions and changes in both concentration and chemical composition of the apo B– and the apo AI–containing lipoproteins. After pravastatin treatment (40 mg/d) for a 12-week period, plasma LDL concentrations (mean±SD, 745.4±51.9 mg/dL) were reduced by 36% in patients with FH (n=6). By contrast, the qualitative features of the density profile of LDL subspecies in patients with FH, in whom the intermediate (d=1.029 to 1.039 g/mL) and dense (d=1.039 to 1.063 g/mL) subspecies were significantly increased relative to a control group, were not modified by pravastatin. In addition, no significant effect on the chemical composition of individual LDL subfractions was observed. Furthermore, plasma HDL concentrations were not modified, although the density distribution of HDL was normalized. Indeed, the HDL density peak was shifted towards the HDL₂ subfraction (ratios of HDL₂ to HDL₃ were 0.7 and 1.1 before and after treatment, respectively). Evaluation of plasma CE transfer protein (CETP) mass was performed with an exogenous CE transfer assay. Under these conditions, no modification of plasma CETP protein mass was induced by pravastatin administration. However, the rate of CE transfer from HDL to LDL was reduced by 24% by pravastatin (61±17 µg CE · h^-1 · mL^-1 plasma; P<.0005), although intermediate and dense LDL subfractions again accounted for the majority (71%) of the total CE transferred to LDL. Thus, pravastatin induced reduction of plasma CETP activity without change in the preferential targeting of the transfer of HDL-CE towards the denser LDL subfractions. In conclusion, pravastatin reduces the elevated flux of CE from HDL to apo B–containing lipoproteins in subjects with heterozygous FH as a result of a reduction in the LDL particle acceptor concentration.

Key Words: LDL particle subspecies • HDL subfractions • HMG-CoA reductase inhibitor • cholesteryl ester

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