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• W2043471738 abstract "Current models suggest that cyclin B1/cdk1 regulates the G2 to M transition and that its activity is maximal during the period from prophase to metaphase in mammalian cells. Although data are lacking, the idea that cyclin B1/cdk1 regulates the transit time from prophase to metaphase is reasonable. Development of small molecule inhibitors of cyclin dependent kinases (cdk’s) as cancer therapeutics presents an opportunity to evaluate the effects of inhibiting cdk’s in asynchronous cell populations. Analysis of cdk1 inhibitors is complicated by their ability to inhibit other cdk’s in vitro at higher concentrations. In this study we measured the effects of two cdk1 inhibitors on S, G2, and M transit for Hela cells and correlated these effects on cyclin B1/cdk1 and cyclin A/cdk2 activities. Dose responses demonstrate that low concentrations of both compounds inhibited the activity of cdk1 but not cdk2 in HeLa cells. The partial loss of cdk1 activity at low doses induced a prophase accumulation during a 3 h period and an increased transit time through mitosis. In addition, both inhibitors lengthened the G2 transit time with progressively greater effect on mid and late G2. High doses of both inhibitors increased the S phase time, which correlated with the inhibition of cdk2 activity. These results suggest that cdk1-cyclin activity is rate limiting for cell cycle progression during a period from mid G2 through prophase." @default.
• W2043471738 created "2016-06-24" @default.
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• W2043471738 creator A5037312131 @default.
• W2043471738 date "2004-03-01" @default.
• W2043471738 modified "2023-10-11" @default.
• W2043471738 title "Inhibition of Cdk1 by Alsterpaullone and Thioflavopiridol Correlates with Increased Transit Time from Mid G2 Through Prophase" @default.
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• W2043471738 doi "https://doi.org/10.4161/cc.3.3.680" @default.
• W2043471738 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14726692" @default.
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