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Enhanced susceptibility of low-density lipoproteins to oxidation in coronary bypass patients with progression of atherosclerosis

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Author: Rijke, Y.B. de · Verwey, H.F. · Vogelezang, C.J.M. · Velde, E.A. van der · Princen, H.M.G. · Laarse, A. van der · Bruschke, A.V.G. · Berkel, T.J.C. van
Type:article
Date:1995
Institution: Gaubius Instituut TNO
Source:Clinica Chimica Acta, 2, 243, 137-149
Identifier: 233105
doi: DOI:10.1016/0009-8981(95)06163-0
Keywords: Biology · apolipoprotein B · coronary artery bypass surgery · coronary atherosclerosis · lipid peroxidation · low-density lipoprotein · apolipoprotein a · apolipoprotein b · cholesterol · high density lipoprotein · low density lipoprotein · retinol · triacylglycerol · adult · aged · angiography · article · atherosclerosis · blood analysis · clinical article · controlled study · coronary artery bypass graft · human · human tissue · lipid analysis · lipid oxidation · male · priority journal · Apolipoproteins · Arteriosclerosis · Ascorbic Acid · Centrifugation, Density Gradient · Coronary Artery Bypass · Disease Progression · Follow-Up Studies · Humans · Lipoproteins, LDL · Male · Middle Aged · Oxidation-Reduction · Triglycerides · Vitamin E

Abstract

Oxidation of low-density lipoprotein (LDL) may play a causal role in atherosclerosis. In this study we analyzed whether the severity of progression of coronary atherosclerosis is related to the susceptibility of LDL to oxidative modification. On the basis of repeated coronary angiography, 28 coronary bypass patients were divided into two groups: group A, 12 patients with, and group B, 16 patients without progression of coronary atherosclerosis. The lag time, reflecting the resistance of LDL to oxidative modification, was significantly smaller in group A as compared with group B (81 ± 10 and 93 ± 15 min, respectively). Besides differences in cholesterol and apolipoprotein B concentrations, the difference in susceptibility of LDL to oxidation significantly contributes to the differences between the progression and the nonprogression group (P = 0.02). In the combined groups of patients, the lag phase of LDL for oxidation was positively correlated with LDL cholesterol ester to protein ratio (r = 0.53, P = 0.01). It is concluded that LDL samples obtained from coronary bypass patients differ with respect to their oxidizability depending on progression of atherosclerosis following coronary bypass surgery. Chemicals/CAS: Apolipoproteins; Ascorbic Acid, 50-81-7; Lipoproteins, LDL; Triglycerides; Vitamin E, 1406-18-4