Cited by 67Antioxidant Activity and Oxidative StressRedox biology and oxidative stressMetal-Catalyzed Oxygenation Mechanisms

The influence of medium components on Cu2+-dependent oxidation of low-density lipoproteins and its sensitivity to superoxide dismutase

Thomas, Craig E.·1992·Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism

Abstract

The extent of in vitro Cu(2+)-dependent oxidation of low-density lipoproteins (LDL) has been reported to vary widely depending upon reaction conditions. In this study, the effect of proteins and amino acids on Cu(2+)-induced LDL oxidation was examined. Treatment of LDL with 5 microM CuSO4 for 18 h in either phosphate-buffered saline (PBS) or Ham's F-10 medium resulted in extensive oxidation as determined by the content of thiobarbituric acid reactive substances (TBARS) and by increased lipoprotein electronegativity. In PBS, oxidation was entirely blocked by histidine and the tripeptide, gly-his-lys (GHK). Oxidation was also prevented by bovine serum albumin, but superoxide dismutase (SOD) provided only 20% protection. Both proteins bound similar amounts of Cu2+, but albumin appeared to be a more effective peroxyl radical trap as evidenced by its ability to prevent LDL oxidation induced by 2,2'-azo-bis(2-amidinopropane hydrochloride). In F-10 medium, SOD had marked inhibitory effects, in contrast to PBS. The addition of disulfides to PBS markedly enhanced the ability of SOD to inhibit oxidation. These results indicate that medium components which affect Cu2+ availability influence LDL oxidation and suggest that albumin is ideally suited as a plasma antioxidant to prevent oxidative modification of LDL. Furthermore, in certain instances, the inhibitory effects of SOD may be attributable to effects such as Cu2+ binding rather than dismutation of superoxide.

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Crossref · 10.1016/0005-2760(92)90256-u

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Authors
Thomas, C. E.
Corresponding author
Thomas, Craig E.
Venue
Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism
Publisher
Elsevier BV
Published
1992-09
Volume
1128
Issue
1
Pages
50-57
ISSN
0005-2760 (ISSN-L)
OpenAlex
W2031221948
Cited by
67
References
45
Citations by year
2024: 1 · 2022: 1 · 2019: 2 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 3 · 2014: 1
FWCI
4.06
Type
journal article
Language
en
Open access
closed
Locations
  • Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
LDL oxidation, superoxide dismutase, bovine serum albumin, histidine, disulfides, copper binding, plasma antioxidants, lipid peroxidation
MeSH terms
Copper, Cystine, Dithiothreitol, Glutathione, Humans, Kinetics, Lipoproteins, LDL, Oxidation-Reduction, Protein Binding, Reference Values, Serum Albumin, Bovine, Superoxide Dismutase, Vitamin E, Glutathione Disulfide

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