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Biomedical subjects

A I Svirnovskiĭ

Publications and source records attributed to A I Svirnovskiĭ.

At least 19 recordsLinked to original sources
PubMed1998

[Unstable chromosome aberrations in lymphocytes of liquidators of the Chernobyl accident consequences].

AIM: Analysis of peripheral blood lymphocytes for detecting unstable chromosome aberrations in liquidators of the Chernobyl disaster consequences and in residents of territories contaminated after the accident. MATERIALS AND METHODS: Peripheral blood lymphocytes were tested for unstable chromosome aberrations in 216 subjects who worked for different periods after the Chernobyl accident in 1986-1987 in the 30-km zone and at adjacent territories. The results were correlated to the duration of stay in the zone, terms of examination after the work, exposure dose fixed in the files, deviations in the health status and blood values, and with similar data on 21 residents of the stringent control regions of the Gomel district and 265 patients with different hematological diseases and donor blood samples exposed in vitro. RESULTS: Chromosome aberrations detected in the examined group are represented by dicentrics, paired and nonpaired fragments, acentric rings, and gaps. CONCLUSION: Although not everything is yet clear, we consider that detection of unstable chromosome aberrations of the dicentric type in lymphocytes of subjects who participated in liquidation of the accident consequences in remote periods after exposure persuasively proves that a radiation exposure, no matter what its dose was, took place, and hence, there are good grounds for including the subjects with aberrations in the high risk group. On the other hand, the absence of such aberrations does not rule out the detrimental effect of radiation on the organism.

Cell Culture Techniques↗
PubMed1996

[Regenerating hematopoietic tissue as a source for a low molecular weight factor that inhibits leukemic cell proliferation].

Using a successive set of chromatographic methods, a low molecular weight factor inhibiting leukemic cells proliferation has been isolated from an aqueous extract of regenerating hematopoietic tissue. This factor inhibits DNA synthesis in leukemic cells about 1000-fold more effectively than the original extract. The factor activity does not change after treatment by proteinase K; however, successive action of endo-alpha-N-acetylgalactose aminidase and proteinase K significantly decreases the efficiency of the factor action. This factor whose molecular mass is less than 3 kDa seems to be of glycopeptide origin.

Amino Acids↗
PubMed1990

[Oxygen activation by lymphocytes during interaction of HLA antibodies with HLA antigens].

The method of luminol-dependent chemiluminescence was used to detect oxygen activation during interaction of HLA antibodies with HLA antigens expressed on lymphocyte surface. Introduction of specific anti-HLA serum into the lymphocyte suspension leads to a rapid decrease of intensity in chemiluminescence intensity follows. The maximum yield of induced chemiluminescence in case of using a specific antiserum is significantly lower than in the control. The method could be used for detection of HLA antigens on lymphocyte surface.

Antigen-Antibody Reactions↗
PubMed1989

[Use of the antioxidant complex of vitamins A, E and C in murine leukemia].

A study was made of the content of ubiquinone, vitamins A, E, ascorbic, dehydroascorbic and diketogulonic acids (DKGA), and malonic dialdehyde (MDA) in the liver, of the content of glutathione, the activity of superoxide dismutase (SOD) and glutathione reductase in red blood cells, of the content of vitamins A, E and ubiquinone in the spleen of C57Bl/6jG mice with inoculated leukemia La. It was found that in red blood cells of the animals with leukemia, the content of vitamin E and DKGA reduced, the MDA level increased, and the content of glutathione dropped whereas SOD activity rose. Application of the antioxidant complex of vitamins A, E, C appreciably improved the characteristics of enzymatic and non-enzymatic antioxidant protection of the liver and red blood cells of the leukemic animals without exerting any noticeable effect on the content of vitamin E and ubiquinone in the leukemic spleen tissue.

Animals↗
PubMed1988

[Mechanisms of the interaction of the leukemic cell with endogenous regulators of the proliferation of hematopoietic tissue].

A substance inhibiting DNA synthesis in mouse leukemic cells was isolated from the regenerating calf spleen. When added to a suspension of leukaemic cells, this substance is adsorbed on their surface. The following changes in cell features being noticed: 1) a minute decrease in electrophoretic cell motility, 2) a decrease in esterase activity of the cells, 3) an increase in microviscosity of membrane lipids, 4) an increase in the intracellular pH values. With a longer contact with this substance, changes in nuclear chromatin structure were noticed, with special reference to weakened bonds between DNA and proteins. The data obtained are of significance for revealing molecular mechanisms of hematopoietic mediator action on target cells.

Adsorption↗
PubMed1988

[Induction of the antileukemic activity in nonimmune allogeneic splenocytes using spleen hemoregulators].

The leukemic mice treated with cyclophosphamide were injected twice a week with the allogenic splenocytes treated for 4 h with the substance isolated from the calf spleen. The leukemia growth inhibition was observed. Syngenic splenocytes were inactive. Allogenic but not syngenic splenocytes manifested a certain antileukemic activity observed in the Winn neutralization and 51Cr release tests, however this activity did not correlate quantitatively with more pronounced antileukemic action of cells in vivo.

Animals↗
PubMed1987

[Anti-leukemia resistance and growth-regulating molecules in hematopoietic tissue].

The analyzed data from literature suggest that the growth-regulating molecules of the hematopoietic tissue are a part of the antileukemic defence system of the body. This component of the antitumour resistance is the first one formed during the multicellular organism evolution. It is of special significance in the tissue stimulated to proliferation in which the number of antiblastic defence cell effectors diminishes in the regenerating tissue while the number of progenitor cells having the oncogenic potential increases.

Growth Substances↗
PubMed1985

[Effect of a substance isolated from the regenerating spleen on the chromatin structural organization and the leukosogenic activity of transplanted cells].

When leukemic cells in vitro are treated with the substance isolated from the regenerating calf spleen, incorporation of 3H-thymidine into DNA is rapidly inhibited. The completeness of DNA synthesis restoration after washing off cells from the substance depends on the duration of the previous contact with the substance. It is the change in the structural organization of chromatin but not the very fact of inhibition of the ability of the cells to the DNA synthesis that is important for a decrease of transplantability of mice cells treated by the substance. The quicker the stability of the DNA/protein interaction in chromatin weakens due to the effect of the substance, the earlier the leukosogenic potential of the treated cells decreases.

Animals↗
PubMed1979

[Effect of RNA and histone preparations on the properties of lymphoid cells].

Preparations of RNA and histones change the electrophoretic mobility of lymphoid cells, the intensity of their respiration and anaerobic glycolysis, and thermo-merchanical properties of DNA-complexes isolated from lymphoid cells. RNA and histones exert their influence on the properties of DNP-systems and the rate of anaerobic glycolysis in the opposite manner. But both these preparations depress the electrophoretic mobility and oxygen consumption.

Animals↗