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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Setkov N.A., Epifanova O.I.
Заглавие : Brief exposures of resting fibroblasts to okadaic acid stimulate DNA synthesis
Колич.характеристики :13 с
Место публикации : Cell Prolif.: BLACKWELL SCIENCE LTD, 1997. - Vol. 30, Is. 1. - P7-19. - ISSN 0960-7722, DOI 10.1111/j.1365-2184.1997.tb00912.x
Примечания : Cited References: 32
Предметные рубрики: PDGF-INDUCED PROLIFERATION
HAMSTER-EMBRYO CELLS
PROTEIN-PHOSPHORYLATION
PHOSPHATASE INHIBITORS
MOUSE FIBROBLASTS
3T3 CELLS
FUSION
TRANSFORMATION
INDUCTION
ARREST
Аннотация: To study further the factors providing for cellular quiescence, we used okadaic acid (OA) at concentrations (0.1, 1, 10 or 100 nM) inhibiting type 1 and/or type 2A protein phosphatases in mammalian cell cultures. Brief (2 h) exposure of resting (0.2% serum for 72 h) NIH 3T3 mouse fibroblasts to OA with subsequent incubation of cells in a medium with 0.2% serum, stimulated DNA synthesis at all concentrations studied. Maximal stimulation was observed following pre-incubation of resting cells with 10 nM OA. Treatment of cycling cells (10% serum) with OA (2 h pulses at 12 h intervals for 72 h) prevented their exit to the resting state on transfer to a medium with 0.2% serum. Brief exposures of resting cells to OA did not affect the rate of protein synthesis. OA pulses in the late pre-replicative period had no effect on the entry of serum-stimulated cells into the S phase. Cell fusion experiments with resting (serum-deprived) and proliferating (serum-stimulated) NIH 3T3 cells, using radioautography with a double-labelling technique, revealed that pre-incubation of resting cells with OA for 2 h before and after fusion abrogates their ability to suppress the onset of DNA synthesis in the nuclei of proliferating cells in heterodikaryons. The results indicate that protein phosphatases of type 1 and/or 2A may be involved in the growth-arrest machinery that provides for cellular quiescence.
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