Isolation of antibodies to hypochlorite-modified low-density lipoproteins from human serum and study of their specificity
- Authors: Grigoryeva K.N.1,2, Dmitrieva A.A.2, Ivanova A.A.2, Denisenko A.D.2
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Affiliations:
- Peter the Great Saint Petersburg Polytechnic University
- Institute of Experimental Medicine
- Issue: Vol 24, No 2 (2024)
- Pages: 61-68
- Section: Original research
- URL: https://journals.rcsi.science/MAJ/article/view/271131
- DOI: https://doi.org/10.17816/MAJ630075
- ID: 271131
Cite item
Abstract
BACKGROUND: Modified low-density lipoproteins have immunogenic properties and induce the production of antibodies. In this case, HOCl promotes the formation of subsequent active halogen-containing compounds interacting with proteins and lipid parts of low-density lipoproteins, which leads to their modification and the production of antibodies to them.
AIM: The aim of this work is to isolate antibodies to hypochlorite modified low-density lipoproteins from human blood sera and study their specificity.
MATERIALS AND METHODS: Malondialdehyde, acetic anhydride and sodium hypochlorite were used to obtain modified low-density lipoproteins. IgG antibodies to hypochlorite modified low-density lipoproteins were isolated by affinity chromatography. The total IgG fraction antibodies was previously isolated from human blood serum using MabSelect Xtra. The specific antibodies to hypochlorite modified low-density lipoproteins were isolated from this IgG pool by affinity chromatography. CNBr-Sepharose 4B conjugated with human serum albumin modified with NaOCl was used as a sorbent. The specificity of antibodies against hypochlorite modified low-density lipoproteins was tested using a competitive enzyme-linked immunosorbent assay. The competitors were hypochlorite modified low-density lipoproteins, acetic anhydride modified low-density lipoproteins and malondialdehyde modified low-density lipoproteins in concentrations (1–250 μg/ml).
RESULTS: IgG antibodies against hypochlorite-modified proteins that interact with hypochlorite modified low-density lipoproteins were detected in human blood. According to ELISA date the binding of the isolated antibodies to hypochlorite modified low-density lipoproteins was almost completely inhibited only by appropriately modified low-density lipoproteins, that is, hypochlorite modified low-density lipoproteins, but not native low-density lipoproteins or acetic anhydride modified low-density lipoproteins. Malondialdehyde modified low-density lipoproteins also showed some competitive activity, but much weaker than hypochlorite modified low-density lipoproteins. Hypochlorite modified low-density lipoproteins itself and, to a lesser extent, malondialdehyde modified low-density lipoproteins competed for binding with antibodies of human serum to hypochlorite modified low-density lipoproteins. Acetic anhydride modified low-density lipoproteins and native low-density lipoproteins did not reduce the efficiency of antibody binding to their antigen.
CONCLUSIONS: Hypochlorite modified low-density lipoproteins forms epitopes independent of other low-density lipoproteins modifications studied. These epitopes are responsible for the formation of specific antibodies.
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##article.viewOnOriginalSite##About the authors
Ksenia N. Grigoryeva
Peter the Great Saint Petersburg Polytechnic University; Institute of Experimental Medicine
Email: ks_grigorieva24@mail.ru
ORCID iD: 0009-0005-3818-9835
Student
Russian Federation, Saint Petersburg; Saint PetersburgAlexandra A. Dmitrieva
Institute of Experimental Medicine
Email: aleksandra-2001@mail.ru
ORCID iD: 0000-0003-2680-4069
SPIN-code: 3009-2698
Junior Researcher of the Department of Biochemistry
Russian Federation, Saint PetersburgAnna A. Ivanova
Institute of Experimental Medicine
Author for correspondence.
Email: anna.ivantcova@gmail.com
ORCID iD: 0000-0002-8673-9628
SPIN-code: 5306-1995
Junior Researcher of the Department of Biochemistry
Russian Federation, Saint PetersburgAlexander D. Denisenko
Institute of Experimental Medicine
Email: add@iem.sp.ru
ORCID iD: 0000-0003-1613-0654
SPIN-code: 7496-1449
MD, Dr. Sci. (Medicine), Professor, Head of the Laboratory of Regulation of Lipid Metabolism
Russian Federation, Saint PetersburgReferences
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