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. 1991 Sep 1;88(17):7580–7584. doi: 10.1073/pnas.88.17.7580

Transformed mammalian cells are deficient in kinase-mediated control of progression through the G1 phase of the cell cycle.

H A Crissman 1, D M Gadbois 1, R A Tobey 1, E M Bradbury 1
PMCID: PMC52345  PMID: 1652754

Abstract

To investigate the role of kinase-mediated mechanisms in regulating mammalian cell proliferation, we determined the effects of the general protein kinase inhibitor staurosporine on the proliferation of a series of nontransformed and transformed cultured rodent and human cells. Levels of staurosporine as low as 1 ng/ml prevented nontransformed cells from entering S phase (i.e., induced G1 arrest), indicating that kinase-mediated processes are essential for commitment to DNA replication in normal cells. At higher concentrations of staurosporine (50-75 ng/ml), nontransformed mammalian cells were arrested in both G1 and G2. The period of sensitivity of nontransformed human diploid fibroblasts to low levels of the drug commenced 3 hr later than the G0/G1 boundary and extended through the G1/S boundary. Interference with activity of the G1-essential kinase(s) caused nontransformed human cells traversing mid-to-late G1 at the time of staurosporine addition to be "set back" to the initial staurosporine block point, suggesting the existence of a kinase-dependent "G1 clock" mechanism that must function continuously throughout the early cycle in normal cells. The initial staurosporine block point at 3 hr into G1 corresponds to neither the serum nor the amino acid restriction point. In marked contrast to the behavior of nontransformed cells, neither low nor high concentrations of staurosporine affected G1 progression in transformed cultures; high drug concentrations caused transformed cells to be arrested solely in G2. These results indicate that kinase-mediated regulation of DNA replication is lost as the result of neoplastic transformation, but the G2-arrest mechanism remains intact.

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Selected References

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