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Clearance of Carbonyl-Modified Low-Density Lipoproteins in Rabbits

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Abstract—

The elimination kinetics of carbonyl-modified low density lipoproteins (LDL) from rabbit bloodstream was studied using isolated LDL of rabbits and humans after preliminary biotinylation or labeling with FITC. Rabbit or human blood plasma LDL were isolated using differential ultracentrifugation in a density gradient; after labeling by biotinylation or by FITC, LDL were modified with various low molecular weight natural dicarbonyls: malondialdehyde (MDA), glyoxal or methylglyoxal. Native (control) and dicarbonyl-modified biotinylated or FITC-labeled LDL were injected into the ear vein of rabbits, and blood samples were taken at certain time intervals. The content of biotinylated LDL in blood plasma was determined by an enzyme immunoassay method; FITC-labeled LDL was determined from the fluorescence spectra. It has been found that glyoxal- and methylglyoxal-modified rabbit and human LDL circulate in the bloodstream of rabbits for almost the same period as native (unmodified) LDL. In contrast to this, MDA-modified rabbit and human LDL were very quickly eliminated from the rabbit bloodstream. Dicarbonyl-modified LDL from human blood plasma is not associated with red blood cells or endothelial cells. We found that using the Oxidized LDL ELISA kits (Mercodia, Sweden) it was possible to identify mainly MDA-modified LDL. The level of MDA-modified LDL in the blood plasma of CHD patients sharply decreased during therapy with evolocumab, the hypocholesterolemic inhibitor of PCSK9 (proprotein convertase of subtilisin/kexin type 9), which activates LDL reutilization in the liver cells. These results explain the extremely rapid clearance of MDA-modified LDL in our experiments by their increased utilization in hepatocytes. The results obtained indicate a high atherogenicity of glyoxal- and methylglyoxal-modified LDL, long-term circulating in the bloodstream.

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ACKNOWLEDGMENTS

The authors are grateful to K.B. Shumaev (Dr. Biol. Sci.), G.G. Konovalova (Cand. Biol. Sci.), and M.A. Grechnikova for their help in the work and participation in the preliminary discussion of the results, as well as Yu.A. Shuvalova (Cand. Med. Sci.) for providing blood samples from patients receiving cholesterol-lowering therapy with evolocumab.

Funding

This work was partially supported by the Russian Science Foundation (project no. 14-15 00245 P).

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Authors and Affiliations

  1. National Medical Research Center (NMRC) of Cardiology, ul. 3-ya Cherepkovskaya 15a, 121552, Moscow, Russia

    A. K. Tikhaze, S. P. Domogatsky & V. Z. Lankin

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  1. A. K. Tikhaze
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  2. S. P. Domogatsky
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  3. V. Z. Lankin
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Correspondence to V. Z. Lankin.

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COMPLIANCE WITH ETHICAL STANDARDS

All animal experiments were carried out in accordance with the International Recommendations of the “European Convention for the Protection of Vertebrate Animals used for Experimental or Other Scientific Purposes” (The European Convention, 1986). All the patients involved in this study have written informed consent for participation in the study. The study protocol was approved by the Ethics Committee of the National Medical Research Center of Cardiology (Moscow).

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The authors declare that they have no conflict of interest.

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Translated by A. Medvedev

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Tikhaze, A.K., Domogatsky, S.P. & Lankin, V.Z. Clearance of Carbonyl-Modified Low-Density Lipoproteins in Rabbits. Biochem. Moscow Suppl. Ser. B 15, 119–124 (2021). https://doi.org/10.1134/S1990750821020104

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  • DOI: https://doi.org/10.1134/S1990750821020104

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