PMID: 3319231Nov 1, 1987Paper

Modification of human serum low density lipoprotein by oxidation--characterization and pathophysiological implications

Chemistry and Physics of Lipids
G JürgensH Esterbauer

Abstract

Plasma low density lipoprotein (LDL) can undergo free radical oxidation either catalyzed by divalent cations, such as Cu2+ or Fe2+ or promoted by incubation with cultured cells such as endothelial cells, smooth muscle cells and monocytes. The content of vitamin E, beta-carotene and unsaturated fatty acids is decreased in oxidized LDL. A breakdown of apolipoprotein-B (apoB), hydrolysis of the phospholipids, an increase of thiobarbituric acid reactive substances and the generation of aldehydes also occur. Changes in the ratio of lipid to protein, the electrophoretic mobility and the fluorescent properties have also been reported to accompany oxidation of this lipoprotein. The functional changes of oxidized LDL include its recognition by the scavenger receptor on macrophages, its cytotoxicity especially to proliferating cells, its chemotactic properties with respect to monocyte-macrophages and its regulation of platelet-derived growth factor-like protein (PDGFc) production by endothelial cells. In this article we summarize some of the contributions to this topic and present speculations relating oxidized LDL to pathological conditions such as atherosclerosis.

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