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Biomedical subjects

V N Sokolov

Publications and source records attributed to V N Sokolov.

15 recordsLinked to original sources
PubMed1978

[Changes in ATPase activity of dog kidney nuclear membrane under the effect of polyenic antibiotics].

Effect of amphotericin B and nistatin on ATPase activity of dog kidney nuclear membranes is studied in vivo and in vitro. Long-term intravenous injections of the antibiotics do not change the ATPase activity of kidney nuclear membranes. However, short-term injections of polyenic antibiotics have some effect on ATPase activity on nuclear membranes: amphotericin B, considerably activates the enzyme . In vitro incubation of isolated dog kidney nuclei with amphotericin and nistatin at concentrations of 1 and 10 mcg/ml does not affect the activity of nuclear membrane ATPase, while increased concentrations of polyenic antibiotics, (up to 200 mcg/ml) results in a slight inhibition of the enzyme activity. The role of the data obtained for solving molecular basis of the toxic effect of polyenic antibiotics.

Adenosine Triphosphatases↗
PubMed1977

[Penetration of polyene antibiotics into human embryonic kidney tissue cell cultures].

Penetration of 14C-amphotericin AM-2 into the cells of the tissue culture of the human embryon kidneys was studied by means of light autoradiography after incubation with the antibiotic. Microscopic examination of the autographs of the cell slices revealed the presence of the radioactive label in the cytoplasm and nucleoplasm of the cells. The revealed intracellular localization of the label was evident of the antibiotic penetration into the cells.

Amphotericin B↗
PubMed1977

[Distribution of polyene antibiotics in the cells of a tissue culture of puppy kidney].

The results of the studies on interacellular distribution of amphotericin AM-2, a wate soluble derivative of amphotericin in the cells of the puppy kidney tissue culture exposed to the antibiotic in a concentration of 50 gamma per 1 ml medium for 17 hours are presented. It was found that the antibiotic was firmly bound with the kidney cells: 15.4 per cent of the initial amount of the antibiotic was detected in the washed cells. Analysis of the antibiotic distribution in separate subcellular components showed that sorption of amphotericin AM-2 by the plasmic membranes, nuclei and cytoplasm was respectively 18.3, 35.6 and 9.7 per cent of the amount absorbed by the cells. Binding of a significant amount of the antibiotic absorbed by the plasmic membranes and nuclei with the above fractions was reversible. The results of the study provided a supposition that amphotericin AM-2 penetrated into the cells of the kidney tissue which adds some new findings to the studies on the mechanism of action of polyenic antibiotics in cells.

Amphotericin B↗
PubMed1975

[Study of the action of nystatin on the plasmatic membranes of the liver of rabbits].

The effect of mystatin on the plasmic membranes of the rabbit liver after intravenous administration of the antibiotic to the animals in a dose of 5 mg/kg was studied. It was found that intravenous administration of nystatin had no effect on the quantitative content of protein, lipids and nucleic acids in the plasmic membranes of the liver. The method of electrophoresis in polyacrylamide gel revealed significant changes in the composition of the liver membrane protein due to the treatment with nystatin. The effect of nystatin on the composition of lipids and fatty acids contained in the membrane lipids was also investigated. The data of the thin layer chromatography showed that nystatin did not affect the qualitative composition and the content of separate lipid fractions in the lipids of the liver plasmic membranes. However, the fatty acid analysis of the membrane lipids after intravenous administration of nystatin revealed a number of qualitative and quantitative differences in the composition of the lipid fatty acids of the membranes tested. The results showed that nystatin affected the membrane structures of the rabbit liver cells.

Animals↗
PubMedDate not supplied

[Concept of labile protein and the adaptation of nitrogen metabolism in protein deficiency in man].

Investigations involving 30 healthy males, who for 45 days consumed standard semisynthetic diets differing in the caseine content (from 0 to 15.1 g of nitrogen per day) and serving as a sole source of protein, furnished data on the nitrogen excretion kinetics and nitrogen balance. Mathematical analysis of these data allowed it to find the existence of general regularity in the nitrogen excretion and to deduce an integral equation of its losses at different levels of nitrogen consumption. Pertinent calculations have ascertained that by the labile protein one should understand not the specific proportion of the total protein in the organism, but the actual rate of its metabolism, manifesting itself in the routine lag-phase during adaptation of the nitrogen metabolism to a new level of the protein allowances in the organism. The data thus made available permitted it, at the same time, to propose a criterion for estimating the optimal requirements of man in proteins.

Adaptation, Physiological↗
PubMedDate not supplied

[Method of calculating endogenous protein losses by the human body].

Investigations conducted with participation of 30 examinees in whom the state of proteinic deficiency or protein fasting was provoked by different protein content in their diets a general regularity in the nature of passage of total nitrogen with urine, faces and summarily through other routes was educed and described mathematically. The endogenous excretion of total nitrogen with urine in young males was found to comprise 2.5 +/- 0.08, with feces--0.75 +/- 0.03 and summarily via other routes--0.59 +/- 0.36 g per day. The mentioned results correlated closely enough with corresponding figures in pertinent literature sources.

Adolescent↗
PubMedDate not supplied

[Biochemical changes in cytoplasmic membranes in dog liver during experimental viral hepatitis].

The composition of cytoplasmic membranes isolated from livers of dogs infected with virus of infectious hepatitis of carnivora (IHC) was studied. Inoculation with IHC virus was found not to cause any marked changes in the contents of proteins, lipids and nucleic acids of the membranes under study, but considerable differences in the composition of membrane proteins, lipids and fatty acids of virus-affected cells were demonstrated. The experimental data suggest that the virus infection exerts a considerable effect on the protein-lipid complex of the cytoplasmic membranes of the cell.

Animals↗