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Evidence for inhibition of low density lipoprotein oxidation and cholesterol accumulation by apolipoprotein H (beta(2)-glycoprotein I)

机译:载脂蛋白H(β(2)-糖蛋白I)抑制低密度脂蛋白氧化和胆固醇积累的证据

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摘要

Low density lipoprotein (LDL) oxidation and lipid accumulation are thought to enhance the progression of atherosclerosis, Apolipoprotein H (apoH) has been implicated in the development of human atherosclerosis, However, the roles of apoH in the oxidative modification of LDL and cellular accumulation of lipid constituents remained uncharacterized, In this study, the level of plasma apoH was found to be significantly associated with the oxidative susceptibility of LDL in human subjects. Plasma levels of apoH were positively correlated with the lag time but negatively correlated with LDL oxidation rate in conjugated diene formation. By using a J774 A.1 macrophage culture system, we found that apoH could not only inhibit the formation of conjugated diene and thiobarbituric acid-reactive substances, but also reduce the electrophoretic mobility of oxidized LDL. Furthermore, apoH decreased cellular accumulation of cholesterol via a reduction in cholesterol influx and an increase in cholesterol efflux, This is the first demonstration that apoH appears to have "antioxidant"-like effects on LDL oxidation. The results also suggest that apoH can inhibit the translocation of cholesterol from extracellular pools to macrophages, suggesting that apoH may play an important role in the prevention of atherosclerosis. (C) 2001 Elsevier Science Inc. All rights reserved. [References: 55]
机译:低密度脂蛋白(LDL)的氧化和脂质蓄积被认为可以促进动脉粥样硬化的发展,载脂蛋白H(apoH)与人类动脉粥样硬化的发展有关,但是apoH在LDL的氧化修饰和细胞的蓄积中的作用脂质成分仍未表征,在这项研究中,血浆apoH的水平与人类受试者LDL的氧化敏感性显着相关。血浆apoH水平与滞后时间呈正相关,与共轭二烯形成过程中的LDL氧化速率呈负相关。通过使用J774 A.1巨噬细胞培养系统,我们发现apoH不仅可以抑制共轭二烯和硫代巴比妥酸反应性物质的形成,而且可以降低氧化的LDL的电泳迁移率。此外,apoH通过减少胆固醇流入和增加胆固醇流出而减少了胆固醇的细胞蓄积。这是apoH似乎对LDL氧化具有“抗氧化剂”作用的首次证明。结果还表明,apoH可以抑制胆固醇从细胞外池向巨噬细胞的转运,这表明apoH可能在预防动脉粥样硬化中起重要作用。 (C)2001 Elsevier Science Inc.保留所有权利。 [参考:55]

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