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Journal of Lipid Research, Vol. 43, 453-462, March 2002
Copyright © 2002 by Lipid Research, Inc.

LDL particle subclasses in hypercholesterolemia: molecular determinants of reduced lipid hydroperoxide stability

^b Institut Fédératif de Recherche "Cur, Muscle, 91 Blvd de l'Hôpital, 75651 Paris 13, France

Correspondence to: M. John Chapman, To whom correspondence should be addressed., chapman{at}chups.jussieu.fr (E-mail)

Hypercholesterolemia is characterized by elevated plasma levels of LDL in which the cholesteryl ester (CE)-rich LDL subclasses of light and intermediate density (LDL1+2 and LDL3, respectively) typically predominate. The molecular mechanisms implicated in oxidation of LDL particle subclasses in hypercholesterolemia are indeterminate. Lipid hydroperoxides (LOOH), primary oxidation products in LDL, are implicated in atherogenesis. LOOH formation was evaluated in light (LDL1+2), intermediate (LDL3), and dense (LDL4+5) LDL subclasses from hypercholesterolemic (HC) subjects (n = 7) during copper-mediated oxidative stress, and compared with that in corresponding subclasses from normolipidemic subjects (n = 7). HC LDL subclasses were distinguished by lower polyunsaturated phospholipid--tocopherol ratios (P < 0.02), lower contents of phosphatidyl choline (PC)16:0-18:0/18:2 and PC16:0-18:0/20:4+22:6 (P < 0.002), and higher surface phospholipid-free cholesterol ratios (P < 0.04). The LDL3, LDL4, and LDL5 subclasses in HC subjects displayed low-core polyunsaturated CE--tocopherol ratios (P < 0.05), despite similar PUFA CE content. These physicochemical differences did not modify the oxidative susceptibility of HC LDL but underlie the marked instability of cholesterol linoleate hydroperoxides in HC LDL1+2, LDL3, and LDL4 subclasses.

Elevated concentrations of large, CE-rich, light, and intermediate LDL subclasses (LDL1+2, LDL3) in hypercholesterolemia may therefore act as an abundant proatherogenic source of highly unstable LOOH in the arterial wall. — Chancharme, L., P. Thérond, F. Nigon, S. Zarev, A. Mallet, E. Bruckert, and M. J. Chapman. LDL particle subclasses in hypercholesterolemia: molecular determinants of reduced lipid hydroperoxide stability. J. Lipid Res. 2002. 43: 453–462.

Supplementary key words: light, intermediate, and dense LDL, oxidative stress, copper-mediated oxidation, surface phospholipid-free cholesterol ratio, polyunsaturated cholesteryl ester--tocopherol ratio, lipophilic antioxidants, cholesteryl ester hydroperoxide stability, apoB-100 conformation, atherogenicity

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