Antitumor activity against human HCT116 cells xenografted in NCR athymic mouse assessed as reduction in tumor volume at 50 mg/kg, po twice daily at 12 to 14 hrs intervals measured after 12 days relative to vehicle treated control
Antitumor activity against human HCT116 cells xenografted in NCR athymic mouse assessed as growth delay at 50 mg/kg, po twice daily at 12 to 14 hrs intervals measured after 12 days relative to vehicle treated control
Cell cycle arrest in human HT-29 cells assessed as reduction at S phase at 3.3 uM up to 16 hrs measuring distribution of bromodeoxyuridine incorporation by flow cytometry
Cell cycle arrest in human HT-29 cells assessed as accumulation at G2/M phase at 3.3 uM up to 16 hrs measuring distribution of bromodeoxyuridine incorporation by flow cytometry
Kinase Assay: The compounds from the examples below were investigated for their CDK2/cyclin E, CDK1/cyclin B, CDK4/cyclin D1 and CDK7/cyclin H, ERK-2, and PKA inhibitory activity. His6-tagged recombinant human cyclin-dependent kinases CDK1/cyclin B1, CDK2/cyclin E, CDK4 and CDK7/cyclin H were expressed in sf9 cells using a baculovirus expression system. Recombinant cyclin D1 was expressed in E. coli. Proteins were purified by metal chelate affinity chromatography to greater than 90% homogeneity. Kinase assays were performed in 96-well plates using recombinant CDK/cyclins, recombinant active ERK-2 (Upstate Biotechnology), or cyclic AMP-dependent kinase (PKA) catalytic subunit (Calbiochem Cat. 539487). Assays were performed in assay buffer (25 mM beta -glycerophosphate, 20 mM MOPS, 5 mM EGTA, 1 mM DTT, 1 mM Na3VO3, pH 7.4), into which were added 2-4 ug of active enzyme with appropriate substrates (purified histone H1 for CDK2, recombinant GST-retinoblastoma protein (residues 773-928) for CDK4.
Kinase Assay: The compounds from the examples below were investigated for their CDK2/cyclin E, CDK1/cyclin B, CDK4/cyclin D1 and CDK7/cyclin H, ERK-2, and PKA inhibitory activity. His6-tagged recombinant human cyclin-dependent kinases CDK1/cyclin B1, CDK2/cyclin E, CDK4 and CDK7/cyclin H were expressed in sf9 cells using a baculovirus expression system. Recombinant cyclin D1 was expressed in E. coli. Proteins were purified by metal chelate affinity chromatography to greater than 90% homogeneity. Kinase assays were performed in 96-well plates using recombinant CDK/cyclins, recombinant active ERK-2 (Upstate Biotechnology), or cyclic AMP-dependent kinase (PKA) catalytic subunit (Calbiochem Cat. 539487). Assays were performed in assay buffer (25 mM beta -glycerophosphate, 20 mM MOPS, 5 mM EGTA, 1 mM DTT, 1 mM Na3VO3, pH 7.4), into which were added 2-4 ug of active enzyme with appropriate substrates (purified histone H1 for CDK2, recombinant GST-retinoblastoma protein (residues 773-928) for CDK4.