Cell experiment:

50% from the initial screen are performed using 10-dose, three-fold serial dilutions of TP-3654 starting with 10 μM at Km ATP concentrations for each kinase[1].-->1 μM TP-3654 is tested against 336 kinases at a concentration of 10 μM ATP. IC50 determinations of phosphoinositide 3-kinase (PI3K) (α, β, δ, and γ) and all kinases inhibited by >50% from the initial screen are performed using 10-dose, three-fold serial dilutions of TP-3654 starting with 10 μM at Km ATP concentrations for each kinase[1].

Animal experiment:

When tumors of mice reaches 100 to 200 mm3 by caliper measurement, mice are randomized, and oral dosing of TP-3654 or vehicle control began and continued every day for 5 days with 2 days off for 18 to 21 days. Tumor volumes and body weights were determined twice a week[1].

TP-3654 is a second-generation Pim kinase inhibitor with Ki values of 5 and 42 nM for Pim-1 and Pim-3, respectively.

TP-3654 demonstrates potent PIM-1 specific cellular activity in the PIM-1/BAD overexpression system with an average EC50 of 67 nM. TP-3654 treatment reduces levels of phospho-BAD in vitro using the bladder cancer cell line UM-UC-3. TP-3654 reduces colony growth of T24 and UM-UC3 cells, confirming the PIM-1-dependent growth for both cell lines[1].

Oral dosing of 200 mg/kg TP-3654 significantly reduces both UM-UC-3 and PC-3 tumor growth measured by volume (caliper) and by final tumor weight, with no significant changes in body weight or gross adverse toxicity[1].

References:
[1]. Foulks JM, et al. A small-molecule inhibitor of PIM kinases as a potential treatment for urothelial carcinomas. Neoplasia. 2014 May;16(5):403-12.