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• W2086717813 abstract "The cyclin-dependent kinase (CDK) inhibitor roscovitine is under evaluation in clinical trials for its antiproliferative properties. Roscovitine arrests cell cycle progression in G(1) and in G(2) phase by inhibiting CDK2 and CDK1, and possibly CDK7 and CDK9. However, the effects of CDK2 inhibition in S-phase cells have been not fully investigated. Here, we show that a short-term treatment with roscovitine is sufficient to inhibit DNA synthesis, and to activate a DNA damage checkpoint response, as indicated by phosphorylation of p53-Ser15, replication protein A, and histone H2AX. Analysis of DNA replication proteins loaded onto DNA during S phase showed that the amount of proliferating cell nuclear antigen (PCNA), a cofactor of DNA replication enzymes, was significantly reduced by roscovitine. In contrast, chromatin-bound levels of DNA polymerase delta, DNA ligase I and CDK2, were stabilized. Checkpoint inhibition with caffeine could rescue PCNA disassembly only partially, pointing to additional effects due to CDK2 inhibition and the presence of replication stress. These results suggest that in S-phase cells, roscovitine induces checkpoint-dependent and -independent effects, leading to stabilization of replication forks and an uncoupling between PCNA and PCNA-interacting proteins." @default.
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• W2086717813 date "2006-09-06" @default.
• W2086717813 modified "2023-09-26" @default.
• W2086717813 title "Replication-Dependent DNA Damage Response Triggered by Roscovitine Induces an Uncoupling of DNA Replication Proteins" @default.
• W2086717813 doi "https://doi.org/10.4161/cc.5.18.3235" @default.
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