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    Brief exposures of resting fibroblasts to okadaic acid stimulate DNA synthesis [Text] / N. A. Setkov, O. I. Epifanova // Cell Prolif. - 1997. - Vol. 30, Is. 1. - P. 7-19, DOI 10.1111/j.1365-2184.1997.tb00912.x. - Cited References: 32 . - ISSN 0960-7722
РУБ Cell Biology
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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Держатели документа:
VA ENGELHARDT MOL BIOL INST,MOSCOW 117984,RUSSIA
RUSSIAN ACAD SCI,INST BIOPHYS,SIBERIAN BRANCH,KRASNOYARSK,RUSSIA
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Setkov, N.A.; Epifanova, O.I.

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