CDK12-IN-E9 is a potent and selective covalent CDK12 inhibitor and a non-covalent CDK9 inhibitor, while avoiding ABC transporter-mediated efflux. CDK12-IN-E9 has weak binding ability to CDK7/CyclinH complex with an IC50> 1 μM[1].
CDK12-IN-E9 (E9; 10 nM-10 μM; 72 hours; Kelly, LAN5, SK-N-BE2, PC-9, NCI-H82 and NCI-H3122 cells) treatment shows potent antiproliferative activity in THZ1R NB and lung cancer cells, with IC50 values ranging from 8 to 40 nM[1].CDK12-IN-E9 (E9; 0-3000 nM; 6 hours; Kelly, PC-9, and NCI-H82 cells) treatment leads to a dose-dependent decrease in phosphorylated and total RNAPII in THZ1r NB and lung cancer models, accompanied by decreased MYC and MCL1 expression[1].CDK12-IN-E9 also results in increased PARP cleavage, and an increase in the subGI population in THZ1r lung cancer cells, while in NB cells, more of a G2/M arrest is seen after a 24-hr exposure to CDK12-IN-E9[1]. Cell Proliferation Assay[1] Cell Line: Kelly, LAN5, SK-N-BE2, PC-9, NCI-H82 and NCI-H3122 cells
[1]. Gao Y, et al. Overcoming Resistance to the THZ Series of Covalent Transcriptional CDK Inhibitors. Cell Chem Biol. 2018 Feb 15;25(2):135-142.e5.