Biomedical subjects
Publications and source records attributed to N A Askarkhodzhaev.
The influence of calcium chloride in production of interferon and biosynthesis of cell proteins, RNA and DNA in the cultures of chick embryo fibroblast cells and murine cells L-929 in response to induction of the cells by poly(I).poly(C) was studied. It was shown that calcium ions in concentrations of 10 to 30 mM markedly increased formation of interferon in the cell cultures.
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A repressor of interferon production is contained in the hyaloplasm of the chick embryo fibroblast cells in the state of hyporeactivity. A factor stimulating interferon production (FSIP) was found in the hyaloplasm of the cells subjected to single or double induction with poly (pI) x poly (pC) followed by exposure to actinomycin D. Both preparations were of the protein nature and possessed high biological activity. They repressed or stimulatd interferon production at a dilution of 1:512-1:1024. The preparations had tissue and inductor specificity, did not affect the Venezuelan equine encephalomyelitis virus and interferon antiviral activity. Unlike the repressor, the FSIP proved to be thermolabile and pH-sensitive in acid media. The half lives of the repressor and stimulator were about 10 and 5 hours respectively.
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Data on the effect of some factors on interferon production in vitro are presented The kinetics of interferon synthesis in response to superinduction was similar to the respective curve of the effect of UV-radiation on the cell. Possible similarity in the effect of these factors on the mechanisms controlling interferon production is noted. An increase in interferon synthesis under the effect of ascorbic acid in cells of chick embryo fibroblast and L-929 was found. Combined use of the inductors provided an increase in the tests of interferon.
A factor stimulating interferon production (FSIP) has been isolated from cells treated once or twice (at an interval of 6-8 hours) with poly(rI).poly(rC) followed by actinomycin D (2 microgram/ml) or dehydrorifampicin (50 microgram/ml). In a dilution 1:512 the preparation stimulated interferon production 4-fold. In higher concentrations, the preparation induced interferon yields of 1280-2560 IE50/ml, i.e. exceeded the control values 16-fold. The factor does not affect the antiviral activity of interferon and has the tissue specificity. Its stimulating effect was not manifested with inducers of other nature. All the properties of FSIP studied show it to be similar with homologous interferon and repressor of its production but, unlike the latter, it was thermolabile and sensitive to acid pH.