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pubmed-article:16012789pubmed:abstractTextFlavopiridol and UCN-01 are two novel protein kinase inhibitors with diverse cellular effects that may complement each other with regards to induction of apoptosis. HeLa cells engineered to overexpress human survivin (HeLa-S) were at least approximately 4.8-fold resistant to UCN-01 relative to proliferation observed in control HeLa cells (HeLa-V). Flavopiridol cytotoxicity as measured using the MTT assay was unaffected in HeLa-S cells when compared with HeLa-V cells. Similarly, simultaneous treatment of HeLa-V cells with flavopiridol and UCN-01 for 72 hours did not result in synergistic inhibition of proliferation; however, in HeLa-S cells, this combination resulted in synergistic inhibition of cell proliferation. Flavopiridol and UCN-01 augmented apoptosis in HeLa-S cells (as compared with HeLa-V cells) as measured by caspase-3 cellular activity assay, DNA fragmentation and PARP cleavage by western blot. In HeLa-V and -S cells, combination treatment resulted in caspase-8 cleavage. Caspase-9 was expressed in HeLa-V cells; however, there was a marked reduction of caspase-9 content in HeLa-S cells only. Combination treatment resulted in a significant reduction in survivin abundance in HeLa-S and SKBR3-UR cells, but not in their respective parental lines. The synergy of Flavopiridol and UCN-01 are selectively toxic to survivin-overexpressing cell lines and the mechanism of toxicity involves caspase-dependent cell death.lld:pubmed
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pubmed-article:16012789pubmed:authorpubmed-author:WangChenguang...lld:pubmed
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pubmed-article:16012789pubmed:articleTitleA study of cytotoxic synergy of UCN-01 and flavopiridol in syngeneic pair of cell lines.lld:pubmed
pubmed-article:16012789pubmed:affiliationAlbert Einstein Comprehensive Cancer Center, Department of Medicine, Albert Einstein College of Medicine, Chanin 302, 1300 Morris Park Avenue, Bronx, NY 10461, USA.lld:pubmed
pubmed-article:16012789pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16012789pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:16012789pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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