Biomedical subjects

A I Kuz'menko

Publications and source records attributed to A I Kuz'menko.

22 records · Page 2Linked to original sources

PubMedDate not supplied

[Characteristics of antioxidant properties of 20-hydroxyecdysone in low density lipoproteins by kinetic parameters of chemiluminescence].

20-Hydroxyecdysone is capable to terminate the lipid free-radical oxidation in low density lipoprotein in vitro as displayed by the kinetic chemiluminescence parameters. In concentrations interval from 2 x 10(-6) mol/l up to 8 x 10(-6) mol/l it statistically reliably reduces maximum of the first flash intensity of the low density lipoprotein Fe(2+)-initiated chemiluminescence. It testifies about Fe(2+)-initiated lipid peroxide process decomposition in low density lipoprotein slowing down by 20-hydroxyecdysone. In concentration of 20-hydroxyecdysone 8 x 10(-6) mol/l the statistically reliable reduction of angle tangent of an ascending branch of the second flash of low density lipoprotein Fe(2+)-initiated chemiluminescence was found. This is a result of free-radical lipid oxidation rate reduction in the low density lipoprotein at the 20-hydroxyeodysone presence. The equations of the kinetic parameters linear dependences Fe(2+)-initiated chemiluminescence in low density lipoprotein on the concentration of 20-hydroxyeodysone and hydroquinone have been received. The correlation factors in the interval from 0.8980 up to 0.6789 have been calculated. Thus, the assumption has been forwarded that 20-hydroxyeodysone has antioxidizing properties. However, its antioxidizing activity in free radical lipid oxidation of is low density lipoprotein is as less as for hydroquinone.

Animals↗

PubMedDate not supplied

[Vitamin D3 and 20-hydroxyecdysone -- inhibitors of free radical lipid oxidation during D-hypervitaminosis].

Under D-hypovitaminosis (control) conditions the statistically reliable increase of blood serum lipids free radical oxidation was revealed in comparison with the intact animals. Administration of vitamin D3 to the animals suffering from D-hypovitaminosis leads for statistically reliable decrease of blood serum lipids free radical oxidation, while 20-hydroxyecdysone in quantity of 0.02 mg per 1 kg of the animal body weight displays the antioxidative properties. Its antioxidative effect is characterized by a statistically reliable increase of Tind chemiluminescence kinetical parameter as compared with the control. Under D-hypovitaminosis conditions in the mitochondrial membranes the products of lipids free radical oxidation--dien conjugates are accumulated. In the case of administrating to the animals suffering from D-hypovitaminosis D3 or 20-hydroxyecdysone these oxidation products are absent. 20-Hydroxyecdysone under these conditions have been revealed as inducing accumulation in the mitochondrial and microsomal membranes of the substances with lambda 225 nm.

Animals↗

PubMedDate not supplied

[Cu(2+) complexes as inhibitors of free radical oxidation of lipids].

Cu(2+) complexes of chelate ligands have been studied for their effect on oxidation of rat blood plasma lipids, sphingomyelin, lecithin by the method of chemoluminescence. The studied Cu(2+) complexes have been shown to possess pro-oxidant and antioxidant properties depending on their concentration. Antioxidant activity of alpha-tocopherol, ionol (2,6-di(tert)-butyl-4-methylphenol) and Cu(2+) complexes by the lipid oxidation has been compared.

Animals↗

PubMedDate not supplied

[Effect of carbon dioxide on free radical processes as affected by artificial hypobiosis in rats].

High CO2 concentrations in the inspired air have been studied for their effect on the free-radical oxidation of lipids in the lipids in the blood, its serum and mitochondria of the rat liver under artificial hypobiosis. Kinetics of free-radical oxidation of lipids was estimated from the changes in chemiluminescence parameters as well as the content of products which react with thiobarbituric acid. It is found that in animals in the state of artificial hypobiosis the intensity of free-radical oxidation of lipids was rather less as compared with animals which did not fall into hypobiosis because of the exclusion of CO2 from the inspired air. The data obtained permit concluding that the increase of CO2 concentration in the inspired air prevents from the development of the oxidative stress. It is evident that the increase of CO2 in the inspired air occurs before the formation of the adaptational mechanisms, directed to the preventing of lesion of membrane lipids under artificial hypobiosis.

Adaptation, Physiological↗