IC50: 0.6 and 0.5 nM forCdk1/cyclin B and Cdk2/cyclin A, respectively

Cdk1/2 Inhibitor III is a Cdk inhibitor.

Cyclin-dependent kinases (CDKs) are a family members of serine-threonine protein kinases responsible for regulation of the eukaryotic cell cycle. Their timed activation guides cells via the cell cycle and ensures the accurate execution of cell division.

In vitro: Cdk1/2 Inhibitor III was identified as a cell-permeable inhibitor of Cdk1/cyclin B and Cdk2/cyclin A and could less potently inhibit CDC2-like kinases 1 and 3, VEGFR2, and GSK-3β. Cdk1/2 Inhibitor III was found to be lack of effect against a panel of other kinases. Moreover, Cdk1/2 Inhibitor III could block the growth of various cancer cell lines (IC50 values range from 20 to 92 nM) [1].

In vivo: The in-vivo efficacy of compound 3b, a structurally close Cdk1/2 Inhibitor III analog, was examined in the A375 human melanoma cell xenograft model. Doses at 125, 100, and 75 mg/kg were administered once a day for 32 days and tumor size was measured every 4 days. The results showed that in the 125 mg/kg group, there was one nontreatment-related death but the remaining four animals experienced stable disease. In addition, compound 3b administered at 100 and 75 mg/kg led to mean day of survival values of 50.1 and 48.5 days, respectively, with only one treatment-related death in the 100 mg/kg group [1].

Clinical trial: So far, no clinical study has been conducted.

Reference:
[1] Lin, R. ,Connolly, P.J.,Huang, S., et al. 1-Acyl-1H-[1,2,4]triazole-3,5-diamine analogues as novel and potent anticancer cyclin-dependent kinase inhibitors: Synthesis and evaluation of biological activities. Journal of Medicinal Chemistry 48(13), 4208-4211 (2005).