Cyclin-dependent kinase 2 (Cdk2) is required for centrosome duplication in mammalian cells - PubMed (original) (raw)
Cyclin-dependent kinase 2 (Cdk2) is required for centrosome duplication in mammalian cells
Y Matsumoto et al. Curr Biol. 1999.
Free article
Abstract
Centrosome duplication is indispensable for the formation of the bipolar mitotic spindle. Surprisingly, even if DNA replication or mitosis is inhibited, centrosome duplication can still occur [1] [2] [3] [4] [5]. Thus, it remains unknown how centrosome duplication is coordinated with the cell cycle. Here, we show that centrosome duplication requires cyclin-dependent kinase 2 (Cdk2) in mammalian cells. We have found that in Chinese hamster ovary (CHO) cells, whereas centrosome duplication is not inhibited by hydroxyurea (HU) treatment, which arrests the cells in S phase, it is inhibited by mimosine treatment, which arrests the cells in late G1 phase. Cdk2 activity was higher in HU-treated cells than in mimosine-treated cells. Remarkably, inhibition of the Cdk2 activity in HU-treated cells with butyrolactone I or roscovitine [6], or by expression of the Cdk inhibitor p21(Waf1/Cip1), blocked the continued centrosome duplication. Moreover, overexpression of Cdk2 reversed the inhibition of centrosome duplication by mimosine treatment. These results indicate a requirement of Cdk2 activity for centrosome duplication and therefore suggest an underlying mechanism for the coordination of centrosome duplication with the cell cycle.
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