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Low-molecular-weight aldehydes (glyoxal, methylglyoxal, 3-deoxyglucosone) generated on autooxidation of glucose under conditions of carbonyl stress react much more actively with amino groups of L-lysine and ε-amino groups of lysine residues of apoprotein B-100 in human blood plasma low density lipoproteins (LDL) than their structural analogs (malonic(More)
Effects of antioxidants and products of lipid peroxidation on hemin-induced formation of probucol radical in low density lipoproteins (LDL) from human plasma were studied by EPR-spectroscopy. Suppression of lipid peroxidation in LDL by probucol and other antioxidants (ascorbate, 6-O-palmitoylascorbate, and ubiquinol-10) prevents the formation of probucol(More)
Pathways of synthesis of the α-reactive carbonyl compound methylglyoxal (MG) in prokaryotes are described in this review. Accumulation of MG leads to development of carbonyl stress. Some pathways of MG formation are similar for both pro- and eukaryotes, but there are reactions specific for prokaryotes, e.g. the methylglyoxal synthase reaction. This reaction(More)
The oxidative modification of low density lipoprotein (LDL) is thought to play an important role in atherogenesis. Drugs of β-hydroxy-β-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) family are usually used as a very effective lipid-lowering preparations but they simultaneously block biosynthesis of both cholesterol and ubiquinone Q10(More)
The effect of adriamycin (doxorubicin) on superoxide radical formation in isolated rat heart mitochondria was studied by the spin trapping technique. The samples were placed into the cavity of EPR spectrometer in thin - wall gas - permeable capillary tubes, which allowed keeping the mitochondria of suspension in aerobic conditions. TIRON was used as a spin(More)
Destructive effect of superoxide anions O2- derived from KO(2) or xanthine-xanthine oxidase system on dinitrosyl-iron complexes bound with bovine albumin or methemoglobin (DNIC-BSA or DNIC-MetHb) was demonstrated. The sensitivity of DNIC-BSA synthesized by the addition of DNIC with cysteine, thiosulfate or phosphate (DNIC-BSA-1, DNIC-BSA-2 or DNIC-BSA-3,(More)
The EPR signal recorded in reaction medium containing L-lysine and methylglyoxal is supposed to come from the anion radical (semidione) of methylglyoxal and cation radical of methylglyoxal dialkylimine. These free radical inter-mediates might be formed as a result of electron transfer from dialkylimine to methylglyoxal. The EPR signal was observed in a(More)
It has been established that, in the presence of S-nitrosothiols, cysteine, and mitochondria, dinitrosyl iron complexes (DNIC) coupled to low-molecular-weight ligands and proteins are formed. The concentration of DNIC depended on oxygen partial pressure. It was shown that, under the conditions of hypoxia, the kinetics of the formation of low-molecular DNIC(More)
Isolated from Micrococcus lysodeikticus, 6-O-(2-deoxy-2-(N-methyl)hydroxilamino-beta-D-glucopyranosyl)-alph a-alpha- trehalose (lysodektose) is oxidized by K3Fe(CN)6 in a stepwise manner to become a nitroxyl radical and a nitrone with a double bond in the fragment O-N = CH2 which could be reduced to the original hydroxylamine form with sodium borohydride.(More)
The effect of antioxidants (vitamins C and E, quercetin, probucol, butylated hydroxytoluene) on the oxidation of beta-carotene and its conversion into retinal under the influence of beta-carotene 15,15'- dioxygenase (CDO) from rat intestinal mucosa was studied. The activity of CDO decreased in the presence of oxidants. Antioxidants protected both the(More)