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• W2071551139 abstract "Proceedings: AACR 104th Annual Meeting 2013; Apr 6-10, 2013; Washington, DCDinaciclib is a potent inhibitor of cyclin dependent kinases (CDKs) 1, 2, 5, and 9 and is currently in Phase 3 for the treatment of refractory chronic lymphocytic leukemia (CLL). To further understand the mechanism of action, identify predictive biomarkers, and find additional cancer types which may benefit from dinaciclib, we evaluated cell viability following 24 hours treatment across a panel of ∼500 cells lines. Hematopoietic cell lines were on average 3-times more sensitive than solid tumor lines. In agreement with previous findings, mRNA expression of the anti-apoptotic family member BCL-xL or the ratio of MCL1-to-BCL-xL continue to be the best predictor of dinaciclib sensitivity in both hematopoietic and solid tumor cell lines. MCL1 appears to be an important target of dinaciclib particularly in MCL1 amplified cell lines. Dependence on MCL1 was established in a panel of 19 breast, NSCLC and SCLC cell lines by depletion of the protein by either dinaciclib treatment or MCL1 RNAi. The NSCLC line H23 was highly dependent on MCL1, as RNAi knockdown decreased viability to 80% tumor regression. Cell lines which lacked pro-apoptotic proteins BAX / BAK or harbored a BAX mutation were insensitive to the inhibitor. Using apoptosis defective lines we demonstrate that 24 hours of dinaciclib treatment still impacted cell count by blocking cell cycle progression as measured by FACS. These data demonstrate that both cell cycle block and induction of apoptosis contribute to dinaciclib's mechanism of action. However, the observation that MCL1 and BCL-xL were top genes associated with sensitivity suggests that induction of apoptosis is the predominant mechanism of dinaciclib's anti-tumor effect and warrants further investigation of MCL1 amplification as a predictive biomarker in future clinical studies.Citation Format: Harold Hatch, Robert Booher, Samanthi Perera, Thi Nguyen, Brian Dolinski, Samer Al-Assaad, Lauren Harmonay, Alwin Schuller, Minilik Angagaw, Brian Long, Xianlu Qu, Nathan Miselis, Mark Ayers, Michael Nebozhyn, Heather Hirsch, Danielle Greenawalt, Andrey Loboda, Thorseten Graef, Ellie Im, Rebecca Blanchard, Leigh Zawel, Peter Strack. MCL1 dependent cells are sensitive to the CDK inhibitor Dinaciclib. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 698. doi:10.1158/1538-7445.AM2013-698" @default.
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• W2071551139 date "2013-04-15" @default.
• W2071551139 modified "2023-09-27" @default.
• W2071551139 title "Abstract 698: MCL1 dependent cells are sensitive to the CDK inhibitor Dinaciclib." @default.
• W2071551139 doi "https://doi.org/10.1158/1538-7445.am2013-698" @default.
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