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• W2155443367 endingPage "8171" @default.
• W2155443367 startingPage "8158" @default.
• W2155443367 abstract "Treatment of tumor cells by chemotherapy activates a series of responses ranging from apoptosis to premature senescence and repair. Survival responses are characterized by inhibition of cyclin-dependent kinases. Because inhibition of cyclin-dependent kinases represents a distinctive feature of DNA damage-induced prosurvival responses, we investigated the possibility that the cyclin-dependent kinase inhibitor roscovitine modulates drug-induced responses in human adenocarcinoma cells, favoring cell survival.Sublethal concentrations of doxorubicin were used to induce premature senescence in human adenocarcinoma cells. The effect of the cyclin-dependent kinase inhibitor roscovitine on the doxorubicin-dependent cell cycle checkpoint activation and DNA repair pathways was evaluated.Roscovitine reinforces doxorubicin-dependent G(1) checkpoint in A549 and HEC1B cells leading to decreased frequency of double-strand breaks and to the preferential induction of senescence and enhanced clonogenic survival. However, in other tumor cell lines, such as HCT116 and H1299, combined treatment with doxorubicin and roscovitine increases the frequency of double-strand breaks and dramatically sensitizes to doxorubicin. This unexpected effect of roscovitine depends on a novel ability to inhibit DNA double-strand break repair processes and requires inactivation of the pRb pathway.Roscovitine, by hindering DNA repair processes, has the potential to inhibit recovery of mildly damaged tumor cells after doxorubicin treatment and to increase the susceptibility of tumor cells to chemotherapy. However, in some tumor cells, the cell cycle inhibitory function of roscovitine prevails over the DNA repair inhibitory activity, favoring premature senescence and clonogenic growth. These data indicate a novel mechanism underlying combined chemotherapy, which may have wide application in treatment of carcinomas." @default.
• W2155443367 created "2016-06-24" @default.
• W2155443367 creator A5011716393 @default.
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• W2155443367 date "2005-11-15" @default.
• W2155443367 modified "2023-10-06" @default.
• W2155443367 title "Roscovitine Modulates DNA Repair and Senescence: Implications for Combination Chemotherapy" @default.
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• W2155443367 doi "https://doi.org/10.1158/1078-0432.ccr-05-1042" @default.
• W2155443367 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16299248" @default.
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