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- W2057132562 abstract "Oxidative modification of LDL is thought to be a radical-mediated process involving lipid peroxides. The small dense LDL subpopulations are particularly susceptible to oxidation, and individuals with high proportions of dense LDL are at a greater risk for atherosclerosis. An oxidatively modified plasma LDL, referred to as LDL-, is found largely among the dense LDL fractions. LDL- and dense LDL particles also contain much greater amounts of lipid peroxides compared with total LDL or the more buoyant LDL fractions. The content of LDL- in dense LDL particles appears to be related to copper- or heme-induced oxidative susceptibility, which may be attributable to peroxide levels. The rate of lipid peroxidation during the antioxidant-protected phase (lag period) and the length of the antioxidant-protected phase (lag time) are correlated with the LDL- content of total LDL. Once LDL oxidation enters the propagation phase, there is no relationship to the initial LDL- content or total LDL lipid peroxide or vitamin E levels. Beyond a threshold LDL- content of approximately 2%, there is a significant increase in the oxidative susceptibility of nLDL particles (ie, purified LDL that is free of LDL-), and this susceptibility becomes more pronounced as the LDL- content increases. nLDL is resistant to copper- or heme-induced oxidation. The oxidative susceptibility is not influenced by vitamin E content in LDL but is strongly inhibited by ascorbic acid in the medium. Involvement of LDL(-)-associated peroxides during the stimulated oxidation of LDL is suggested by the inhibition of nLDL oxidation when LDL- is treated with ebselen prior to its addition to nLDL. Populations of LDL enriched with LDL- appear to contain peroxides at levels approaching the threshold required for progressive radical propagation reactions. We postulate that elevated LDL- may constitute a pro-oxidant state that facilitates oxidative reactions in vascular components." @default.
- W2057132562 created "2016-06-24" @default.
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- W2057132562 date "1996-06-01" @default.
- W2057132562 modified "2023-09-23" @default.
- W2057132562 title "Contribution of an In Vivo Oxidized LDL to LDL Oxidation and Its Association With Dense LDL Subpopulations" @default.
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- W2057132562 doi "https://doi.org/10.1161/01.atv.16.6.784" @default.
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