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• W2015414530 abstract "Oxidation of low-density lipoprotein (LDL), the major cholesterol carrier in plasma, is thought to promote atherogenesis via several mechanisms. One proposed mechanism involves fusion of oxidized LDL in the arterial wall; another involves oxidation-induced amyloid formation by LDL apolipoprotein B. To test these mechanisms and to determine the effects of oxidation on the protein secondary structure and lipoprotein fusion in vitro, we analyzed LDL oxidized by nonenzymatic (Cu2+, H2O2, and HOCl) or enzymatic methods (myeloperoxidase/H2O2/Cl- and myeloperoxidase/H2O2/NO2-). Far-UV circular dichroism spectra showed that LDL oxidation induces partial unfolding of the secondary structure rather than folding into cross-β amyloid conformation. This unfolding correlates with increased negative charge of oxidized LDL and with a moderate increase in thioflavin T fluorescence that may result from electrostatic attraction between the cationic dye and electronegative LDL rather than from dye binding to amyloid. These and other spectroscopic studies of low- and high-density lipoproteins, which encompass amyloid-promoting conditions (high protein concentrations, high temperatures, acidic pH), demonstrate that in vitro lipoprotein oxidation does not induce amyloid formation. Surprisingly, turbidity, near-UV circular dichroism, and electron microscopic data demonstrate that advanced oxidation inhibits heat-induced LDL fusion that is characteristic of native lipoproteins. Such fusion inhibition may result from the accumulation of anionic lipids and lysophospholipids on the particle surface and/or from protein cross-linking upon advanced lipoprotein oxidation. Consequently, oxidation alone may prevent rather than promote LDL fusion, suggesting that additional factors, such as albumin-mediated removal of lipid peroxidation products and/or LDL binding to arterial proteoglycans, facilitate fusion of oxidized LDL in vivo." @default.
• W2015414530 created "2016-06-24" @default.
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• W2015414530 date "2007-04-20" @default.
• W2015414530 modified "2023-10-14" @default.
• W2015414530 title "Effects of Oxidation on the Structure and Stability of Human Low-Density Lipoprotein" @default.
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• W2015414530 doi "https://doi.org/10.1021/bi700225a" @default.
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