Ribociclib (LEE011) succinate (Kisqali) is a highly specific dual inhibitor of CDK4 and CDK6 with IC50 of 10 nM and 39 nM, respectively.
Ribociclib (LEE011) succinate (Kisqali) is a highly specific dual inhibitor of CDK4 and CDK6 with IC50 of 10 nM and 39 nM, respectively.
LEE011, as dual CDK4/CDK6 inhibitor, significantly inhibits the growth of 12 of 17 neuroblastoma cell lines with mean IC50 of 307 nM. The growth inhibition of neuroblastoma cell lines is primarily cytostatic and is mediated by a G1 cell-cycle arrest and cellular senescence. [2]
LEE011 (200 mg/kg daily, p.o.) significantly causes tumor growth delay in mice harboring the BE2C or 1643 xenografts with no weight loss or other signs of toxicity. [2]
[1] Todd VanArsdale, et al. Clin Cancer Res. 2015 Jul 1;21(13):2905-10. [2] Rader J, et al. Clin Cancer Res. 2013, 19(22), 6173-6182. [3] Antonio Marra, Giuseppe Curigliano. NPJ Breast Cancer. 2019 Aug 29;5:27.
Cell experiment: | Cells are grown for 24 hours in 35 mm plates, treated with 500 nM Ribociclib for 6 days, and then fixed and stained overnight. Cells are then imaged for SA-β-gal using an Axio Observer D.1 phase contrast microscope. The percentage of SA-β-gal positive cells is determined by counting the number of positive cells present in three separate microscope frames, and then normalizing to the control. To assess apoptotic activity, cells are plated in triplicate in 96 well plates, treated with Ribociclib, and assayed for caspase 3/7 activation 16 hours after treatment with Caspase-Glo 3/7. Cells treated with SN-38 are used as a positive control[2]. |
Animal experiment: | Mice[2] The BE2C, NB-1643, or EBC1 cell line-derived xenografts are implanted subcutaneously into the right flank of CB17 SCID-/- mice. Animals bearing engrafted tumors of 200-600 mm3 are then randomized to oral treatment with 200 mg/kg Ribociclib in 0.5 % methylcellulose (n=10) or vehicle (n=10) daily for a total of 21 days. Tumor burden is determined periodically throughout treatment according to the formula (π/6)×d2, where d represents the mean tumor diameter obtained by caliper measurement. |
参考文献: [1]. VanArsdale T, et al. Molecular Pathways: Targeting the Cyclin D-CDK4/6 Axis for Cancer Treatment. Clin Cancer Res. 2015 Jul 1;21(13):2905-10. | |
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