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The content of lipoperoxidation products in normal and atherosclerotic human aorta

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Abstract

To evaluate the role of lipid oxidation in atherogenesis the levels of lipid- and protein-bound products of peroxidation in normal and atherosclerotic areas of human aorta were investigated. The level of fluorescent (360/430 nm) lipid products was measured in chloroform-methanol extracts of aortic tissue. Normal intima, initial lesions and fatty streaks had a similar content of fluorescent substances. On the other hand, high level of fluorescent products was found in atherosclerotic plaques. Cholesterol covalently bound to proteins, which serve as a marker of lipoperoxidation, was measured by high performance liquid chromatography after mild alkaline hydrolysis of delipidated tissue protein samples. The levels of protein-bound cholesterol in initial lesions and fatty streaks were close to its content in uninvolved intima (59 ± 18 and 92 ± 18 vs 70 ± 13 nmol/g protein). The content of covalently bound cholesterol in atherosclerotic plaques was dramatically higher (90-fold) than in the normal tissue. In addition to protein-bound cholesterol, considerable amount of lipofuscin was revealed in the cells of atherosclerotic plaques, but not in the cells of normal intima, initial lesions or fatty streaks. Thus, the contents of all investigated lipid- and protein-bound products of lipoperoxidation in earlier atherosclerotic lesions were similar to their levels in normal tissue. It can be due to a low rate of oxidized product formation and/or high rate of its degradation in or elimination from the vessel wall.

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Authors and Affiliations

  1. V.V. Tertov, Institute of Experimental Cardiology, Cardiology Research Center, 121552, Moscow, Russia

    Vladimir V. Tertov

  2. Institute for Atherosclerosis Research, Academy of Natural Sciences, Moscow, Russia

    Vladimir V. Tertov, V.V. Kaplun, I.A. Mikhailova, I.V. Suprun & A.N. Orekhov

  3. Institute of Experimental Cardiology, Cardiology Research Center, Moscow, Russia

    V.V. Kaplun, I.A. Mikhailova, I.V. Suprun & A.N. Orekhov

Authors
  1. Vladimir V. Tertov
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  2. V.V. Kaplun
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  3. I.A. Mikhailova
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  4. I.V. Suprun
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  5. A.N. Orekhov
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Correspondence to Vladimir V. Tertov.

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Tertov, V.V., Kaplun, V., Mikhailova, I. et al. The content of lipoperoxidation products in normal and atherosclerotic human aorta. Mol Cell Biochem 225, 21–28 (2001). https://doi.org/10.1023/A:1012267520932

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