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THE ENTRY INTO S-PERIOD OF NUCLEI IN HETERODIKARYONS MODIFIED BY THE CYCLOHEXIMIDE [Текст] / N. A. SETKOV, V. N. KAZAKOV, T. V. ANDREEVA // TSITOLOGIYA. - 1991. - Vol. 33, Is. 12. - P. 73-78. - Cited References: 16 . - ISSN 0041-3771

РУБ Cell Biology
Рубрики:
NIH 3T3 CELLS
   DNA-SYNTHESIS
   RESTING CELLS
   C-MYC
   FUSION
   FIBROBLASTS
   EXPRESSION
   GENES
Аннотация: Serum-deprived (0.2%) resting NIH 3T3 mouse fibroblasts were fused with serum-stimulated (10%) proliferating cells to elucidate mechanisms of entering into S-period operating in the nuclei of the heterokaryons under the effect of cycloheximide - an inhibitor of protein synthesis. Using radioautography DNA synthesis was investigated in mono-, homo- and heterodikaryons. After short (0.5-3.0 h) depressing of protein synthesis, the nuclei of stimulated cells in heterokaryons were found to enter into S-period. Under these conditions no induction of DNA synthesis was found in the nuclei of resting cells in heterodikaryons. In other experiments, resting cells were under the effect of cycloheximide during 2-4 h before the fusion, that led to a great induction of DNA synthesis in the nuclei of these cells in heterodikaryons. The data obtained are consistent with the idea of fibroblast transition to the rest under the action of labile proteins-repressors.

WOS : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
SETKOV, N.A.; KAZAKOV, V.N.; ANDREEVA, T.V.

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PROTEIN-SYNTHESIS INHIBITORS, LIKE GROWTH-FACTORS, MAY RENDER RESTING 3T3 CELLS COMPETENT FOR DNA-SYNTHESIS - A AUTORADIOGRAPHIC AND CELL-FUSION STUDY [Text] / N. A. SETKOV [et al.] // Cell Prolif. - 1992. - Vol. 25, Is. 3. - P. 181-191, DOI 10.1111/j.1365-2184.1992.tb01393.x. - Cited References: 20 . - ISSN 0960-7722

РУБ Cell Biology
Рубрики:
C-MYC
   CYCLOHEXIMIDE
   FIBROBLASTS
   EXPRESSION
   INDUCTION
   GENES
   FOS
Аннотация: Serum-deprived (0.1-0.2%) resting NIH 3T3 mouse fibroblasts pre-incubated with cycloheximide (7.5-mu-g/ml), or puromycin (10-mu-g/ml), were fused with stimulated cells taken 10 h after changing the medium to one containing 10% serum, and DNA synthesis was investigated in the nuclei of monokaryons, homodikaryons and heterodikaryons using radioautography with the double-labelling technique. Pre-incubation of resting cells with inhibitors of protein synthesis for 1-4 h abolished their ability to suppress DNA synthesis in stimulated nuclei in heterokaryons. Three hours after the removal of cycloheximide from the medium, the resting cells acquired once again the inhibitory capacity for entry of stimulated nuclei into the S period. This inhibitory influence disappeared also in the case of post-fusion cycloheximide application as well as following an 8-12 h pre-treatment of resting cells with actinomycin D (1-mu-g/ml) prior to fusion. Pre-incubation of resting cells for 12 h with PDGF (1 u/ml-1) followed by an 8-48 h incubation in serum-free medium stimulated the onset of DNA synthesis. A brief exposure (45 min) of resting cells to cycloheximide (7.5-mu-g/ml), or puromycin (7.5-mu-g/ml), exerted a similar effect, inducing by itself the entry of cells into the S period. The results support the assumption that acquirement, by resting cells, of competence for DNA replication includes as a necessary step the down-regulation of intracellular growth inhibitors whose formation depends on protein synthesis.

WOS
Держатели документа:
ACAD SCI USSR,INST BIOPHYS,KRASNOYARSK,USSR
WA ENGELHARDT MOLEC BIOL INST,MOSCOW,USSR
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
SETKOV, N.A.; KAZAKOV, V.N.; ROSENWALD, I.B.; MAKAROVA, G.F.; EPIFANOVA, O.I.

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Dynamics of activity of the key enzymes of polyhydroxyalkanoate metabolism in Ralstonia eutropha B5786 [Text] / T. G. Volova [et al.] // Appl. Biochem. Microbiol. - 2004. - Vol. 40, Is. 2. - P. 170-177, DOI 10.1023/B:ABIM.0000018921.04863.d5. - Cited References: 27 . - ISSN 0003-6838

РУБ Biotechnology & Applied Microbiology + Microbiology
Рубрики:
POLY-BETA-HYDROXYBUTYRATE
   ORGANISM ALCALIGENES-EUTROPHUS
   ESCHERICHIA-COLI
   PHB
   POLY(3-HYDROXYBUTYRATE)
   BIOSYNTHESIS
   CLONING
   GENES
   CHAIN
   H16
Аннотация: The dynamics of accumulation of polyhydroxybutyrate (PHB) and the activities of key enzymes of PHB metabolism (beta-ketothiolase, acetoacetyl-CoA reductase, PHB synthase, D-hydroxybutyrate dehydrogenase, and PHB depolymerase) in the hydrogen bacterium Ralstonia eutropha B5786 were studied under various conditions of carbon nutrition and substrate availability. The highest activities of beta-ketothiolase, acetoacetyl-CoA reductase, and PHB synthase were recorded during acceleration of PHB synthesis. The activities of enzymes catalyzing PHB depolymerization (PHB depolymerase and D-hydroxybutyrate dehydrogenase) were low, being expressed only upon stimulated endogenous PHB degradation. The change of carbon source (CO2 or fructose) did not affect the time course of the enzyme activity significantly.

WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Volova, T.G.; Kalacheva, G.S.; Gorbunova, O.V.; Zhila, N.O.

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