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Whole plasma oxidation assay as a measure of lipoprotein oxidizability.

Abstract

Lipoprotein oxidation induced in vitro in whole plasma is expected to be a more relevant model of the lipoprotein oxidation in the arterial wall than the in vitro oxidation of single isolated lipoproteins, e.g., low density lipoprotein (LDL). However, it is unclear, whether the oxidizability of whole plasma may serve as an adequate measure of the oxidizability of plasma lipoproteins. We measured the oxidizability of whole plasma diluted 150-fold as an absorbance increase at 234 nm known to reflect the level of conjugated dienes in the samples. Plasma oxidation was induced by Cu(II), 2,2'-azobis-(2-amidinopropane) hydrochloride (AAPH), lipoxygenase or myeloperoxidase+H2O2. Oxidizability of human plasma measured in the presence of Cu(II) was found to correlate with the oxidizability of LDL measured in the common Cu(II)-based LDL oxidation assay. The plasma oxidizability also correlated positively with plasma oxidizable fatty acid and negatively with plasma antioxidant content. Supplementation of human plasma with different antioxidants (albumin, urate, ascorbate, bilirubin, alpha-tocopherol and ubiquinol-10) in vitro decreased its oxidizability. Supplementation of Watanabe heritable hyperlipidaemic rabbits with different antioxidants (vitamin E, ubiquinone-10, probucol, carvedilol) in vivo lowered the oxidizability of rabbit plasma in comparison with rabbits fed standard diet. When plasma from hyperlipidaemic patients with or without coronary heart disease and from age-matched healthy controls was studied, the plasma oxidizability was found to be highest in the patients with coronary heart disease and lowest in the controls. Taken together, these data indicate that the plasma oxidation assay (i) provides information similar to that obtained using the common LDL oxidation assay, (ii) upgrades the latter, taking into account the effect of hydrophilic antioxidants on lipoprotein oxidation and characterizing the oxidizability of all plasma lipoproteins, and (iii) offers important practical advantages, such as fast and simple sample processing, low amount of plasma required and avoidance of artefactual oxidation during lipoprotein isolation. We propose the measurement of plasma oxidizability at 234 nm as an adequate practical index of the oxidizability of plasma lipoproteins.

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  • Authors+Show Affiliations

    ,

    Medical Clinic, Universitätskrankenhaus Eppendorf, Hamburg, Germany.

    , , , , , , ,

    Source

    BioFactors (Oxford, England) 6:2 1997 pg 99-109

    MeSH

    Amidines
    Animals
    Antioxidants
    Carotenoids
    Copper
    Fatty Acids, Nonesterified
    Humans
    Hydrogen Peroxide
    Hyperlipidemias
    Lipoproteins
    Lipoproteins, LDL
    Lipoxygenase
    Oxidants
    Oxidation-Reduction
    Peroxidase
    Rabbits
    Regression Analysis
    Ubiquinone
    Vitamin E
    beta Carotene

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    9259991

    Citation

    Kontush, A, et al. "Whole Plasma Oxidation Assay as a Measure of Lipoprotein Oxidizability." BioFactors (Oxford, England), vol. 6, no. 2, 1997, pp. 99-109.
    Kontush A, Spranger T, Reich A, et al. Whole plasma oxidation assay as a measure of lipoprotein oxidizability. Biofactors. 1997;6(2):99-109.
    Kontush, A., Spranger, T., Reich, A., Djahansouzi, S., Karten, B., Braesen, J. H., ... Beisiegel, U. (1997). Whole plasma oxidation assay as a measure of lipoprotein oxidizability. BioFactors (Oxford, England), 6(2), pp. 99-109.
    Kontush A, et al. Whole Plasma Oxidation Assay as a Measure of Lipoprotein Oxidizability. Biofactors. 1997;6(2):99-109. PubMed PMID: 9259991.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Whole plasma oxidation assay as a measure of lipoprotein oxidizability. AU - Kontush,A, AU - Spranger,T, AU - Reich,A, AU - Djahansouzi,S, AU - Karten,B, AU - Braesen,J H, AU - Finckh,B, AU - Kohlschütter,A, AU - Beisiegel,U, PY - 1997/1/1/pubmed PY - 1997/1/1/medline PY - 1997/1/1/entrez SP - 99 EP - 109 JF - BioFactors (Oxford, England) JO - Biofactors VL - 6 IS - 2 N2 - Lipoprotein oxidation induced in vitro in whole plasma is expected to be a more relevant model of the lipoprotein oxidation in the arterial wall than the in vitro oxidation of single isolated lipoproteins, e.g., low density lipoprotein (LDL). However, it is unclear, whether the oxidizability of whole plasma may serve as an adequate measure of the oxidizability of plasma lipoproteins. We measured the oxidizability of whole plasma diluted 150-fold as an absorbance increase at 234 nm known to reflect the level of conjugated dienes in the samples. Plasma oxidation was induced by Cu(II), 2,2'-azobis-(2-amidinopropane) hydrochloride (AAPH), lipoxygenase or myeloperoxidase+H2O2. Oxidizability of human plasma measured in the presence of Cu(II) was found to correlate with the oxidizability of LDL measured in the common Cu(II)-based LDL oxidation assay. The plasma oxidizability also correlated positively with plasma oxidizable fatty acid and negatively with plasma antioxidant content. Supplementation of human plasma with different antioxidants (albumin, urate, ascorbate, bilirubin, alpha-tocopherol and ubiquinol-10) in vitro decreased its oxidizability. Supplementation of Watanabe heritable hyperlipidaemic rabbits with different antioxidants (vitamin E, ubiquinone-10, probucol, carvedilol) in vivo lowered the oxidizability of rabbit plasma in comparison with rabbits fed standard diet. When plasma from hyperlipidaemic patients with or without coronary heart disease and from age-matched healthy controls was studied, the plasma oxidizability was found to be highest in the patients with coronary heart disease and lowest in the controls. Taken together, these data indicate that the plasma oxidation assay (i) provides information similar to that obtained using the common LDL oxidation assay, (ii) upgrades the latter, taking into account the effect of hydrophilic antioxidants on lipoprotein oxidation and characterizing the oxidizability of all plasma lipoproteins, and (iii) offers important practical advantages, such as fast and simple sample processing, low amount of plasma required and avoidance of artefactual oxidation during lipoprotein isolation. We propose the measurement of plasma oxidizability at 234 nm as an adequate practical index of the oxidizability of plasma lipoproteins. SN - 0951-6433 UR - https://www.unboundmedicine.com/medline/citation/9259991/Whole_plasma_oxidation_assay_as_a_measure_of_lipoprotein_oxidizability_ L2 - https://content.iospress.com/openurl?genre=article&issn=0951-6433&volume=6&issue=2&spage=99 DB - PRIME DP - Unbound Medicine ER -