Oxidation and antioxidation of human low-density lipoprotein and plasma exposed to 3-morpholinosydnonimine and reagent peroxynitrite.
As peroxynitrite is implicated as an oxidant for low-density lipoprotein (LDL) in atherogenesis, we investigated this process using reagent peroxynitrite (ONOO-) and 3-morpholinosydnonimine (SIN-1, which produces peroxynitrite via generation of NO. and O2.-). LDL oxidation was assessed by the consumption of ubiquinol-10 (CoQ10H2) and alpha-tocopherol (alpha-TOH), the accumulation of cholesteryl ester hydro(pero)xides, the loss of lysine (Lys) and tryptophan (Trp) residues, and the change in relative electrophoretic mobility. Exposure to ONOO- or SIN-1 resulted in rapid (<1 min) and time-dependent oxidation, respectively, of LDL's lipids and protein. Manipulating the alpha-TOH content by in vivo or in vitro means showed that when ONOO- or SIN-1 was used at oxidant-to-LDL ratios of <100:1 the extent of LDL lipid peroxidation increased with increasing initial alpha-TOH content. In contrast, in vivo enrichment with the co-antioxidant CoQ10H2 decreased LDL lipid peroxidation induced by SIN-1. At oxidant-to-LDL ratios of >200:1, alpha-TOH enrichment decreased LDL lipid peroxidation for both SIN-1 and ONOO-. In contrast to lipid peroxidation, altering the alpha-TOH content of LDL did not affect Trp or Lys loss, independent of the amounts of either oxidant added. Aqueous antioxidants inhibited ONOO--induced lipid and protein oxidation with the order of efficacy: 3-hydroxyanthranilate (3-HAA) > urate > ascorbate. With SIN-1, these antioxidants inhibited Trp consumption, while only the co-antioxidants ascorbate and 3-HAA prevented alpha-TOH consumption and lipid peroxidation. Exposure of human plasma to SIN-1 resulted in the loss of ascorbate followed by loss of CoQ10H2 and bilirubin. Lipid peroxidation was inhibited during this period, though proceeded as a radical-chain process after depletion of these antioxidants and in the presence of alpha-TOH and urate. Bicarbonate at physiological concentrations decreased ONOO--induced lipid and protein oxidation, whereas it enhanced SIN-1-induced lipid peroxidation, Trp consumption, and alpha-tocopheroxyl radical formation in LDL. These results indicate an important role for tocopherol-mediated peroxidation and co-antioxidation in peroxynitrite-induced lipoprotein lipid peroxidation, especially when peroxynitrite is formed time-dependently by SIN-1. The studies also highlight differences between ONOO-- and SIN-1-induced LDL oxidation with regards to the effects of bicarbonate, ascorbate, and urate.
Thomas
S R
SR
The Biochemistry and EPR Groups, The Heart Research Institute, 145 Missenden Road, Camperdown, Sydney, NSW 2050, Australia. biochemistry@hri.edu.au
Davies
M J
MJ
Stocker
R
R
D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors*; D000328:Adult; D000975:Antioxidants / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008077:Lipoproteins, LDL / Q000737:chemistry* / Q000187:drug effects*; D008297:Male; D013058:Mass Spectrometry; D008981:Molsidomine / Q000031:analogs & derivatives* / Q000494:pharmacology; D009566:Nitrates / Q000494:pharmacology*; D016877:Oxidants / Q000494:pharmacology*; D010084:Oxidation-Reduction; D010949:Plasma / Q000737:chemistry* / Q000187:drug effects*; D014451:Ubiquinone / Q000031:analogs & derivatives / Q000494:pharmacology; D014810:Vitamin E / Q000494:pharmacology
D000975:Antioxidants; D004791:Enzyme Inhibitors; D008077:Lipoproteins, LDL; D009566:Nitrates; D016877:Oxidants; D014451:Ubiquinone; D014810:Vitamin E; C039642:peroxynitric acid; C026663:ubiquinol-10; C002385:linsidomine; D008981:Molsidomine; D000251:Adenosine Triphosphatases