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Dual CDK4/CDK6 inhibition induces cell-cycle arrest and senescence in neuroblastoma

Kim, Sunkyu, Caponigro, Giordano, Parasuraman, Sudha, Rader, JulieAnn, Maris, John, Russell, Mike, Hart, Lori, Nakazawa, Michael, Belcastro, Lili, Martinez, Daniel, Li, Yimei, Carpenter, Erica, Attiyeh, Edward, Schnepp, Robert, Wood, Andrew, Pawel, Bruce and Cole, Kristina (2013) Dual CDK4/CDK6 inhibition induces cell-cycle arrest and senescence in neuroblastoma. Clinical Cancer Research, 19 (22). pp. 6173-6182. ISSN 1078-0432


Purpose: Neuroblastoma is a pediatric cancer that continues to exact significant morbidity and mortality. Recently, a number of cell-cycle proteins, particularly those within the Cyclin D/CDK4/CDK6/RB network, have been shown to exert oncogenic roles in neuroblastoma, suggesting that their therapeutic exploitation might improve patient outcomes. Experimental Procedures: We evaluated the effect of dual CDK4/CDK6 inhibition on neuroblastoma viability using LEE011 (Novartis Oncology), a highly specific CDK4/6 inhibitor. Results: Treatment with LEE011 significantly reduced proliferation in 12 of 17 human neuroblastomaderived cell lines by inducing cytostasis at nanomolar concentrations (mean IC50 = 307 ± 68 nmol/L in sensitive lines). LEE011 caused cell-cycle arrest and cellular senescence that was attributed to dosedependent decreases in phosphorylated RB and FOXM1, respectively. In addition, responsiveness of neuroblastoma xenografts to LEE011 translated to the in vivo setting in that there was a direct correlation of in vitro IC50 values with degree of subcutaneous xenograft growth delay. Although our data indicate that neuroblastomas sensitive to LEE011 were more likely to contain genomic amplification of MYCN (P =0.01), the identification of additional clinically accessible biomarkers is of high importance. Conclusions: Taken together, our data show that LEE011 is active in a large subset of neuroblastoma cell line and xenograft models, and supports the clinical development of this CDK4/6 inhibitor as a therapy for patients with this disease. © 2013 American Association for Cancer Research.

Item Type: Article
Date Deposited: 14 Mar 2018 00:45
Last Modified: 25 Jan 2019 00:46