YKL-5-124 TFA is a potent, selective, irreversible and covalent inhibitor of CDK7 (IC50s of 53.5 nM and 9.7 nM for CDK7 and CDK7 Mat1 CycH, respectively).
Samuraciclib (CT7001) is a potent, selective, and orally active inhibitor of CDK7, with an ATP-competitive nature. It effectively inhibits CDK7 with an IC 50 value of 41 nM. Furthermore, Samuraciclib demonstrates remarkable selectivity ratios, with 45-fold, 15-fold, 230-fold, and 30-fold selectivity over CDK1, CDK2 (IC 50 of 578 nM), CDK5, and CDK9, respectively. Notably, Samuraciclib has been found to inhibit the growth of breast cancer cell lines, exhibiting GI 50 values ranging between 0.2-0.3 μM. Additionally, Samuraciclib has been observed to possess anti-tumor effects [1] [2].
Ibulocydine is a potent CDK inhibitor. Ibulocydine has high activity against Cdk7 cyclin H Mat1 and Cdk9 cyclin T. Ibulocydine inhibited the growth of HCC cells more effectively than other Cdk inhibitors, including olomoucine and roscovitine, whereas ibulocydine as well as the other Cdk inhibitors and BMK-Y101 minimally influenced the growth of normal hepatocyte cells. Ibulocydine induced apoptosis in HCC cells, most likely by inhibiting Cdk7 and Cdk9. In vitro treatment of HCC cells with ibulocydine rapidly blocked phosphorylation of the carboxyl-terminal domain (CTD) of the large subunit of RNA polymerase II, a process mediated by Cdk7 9. Anti-apoptotic gene products such as Mcl-1, survivin, and X-linked IAP (XIAP) are crucial for the survival of many cell types, including HCC. Following the inhibition of RNA polymerase II phosphorylation, ibulocydine caused rapid down-regulation of Mcl-1, survivin, and XIAP, thus inducing apoptosis. Furthermore, ibulocydine effectively ind......