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The Pim protein kinases are frequently overexpressed in prostate cancer and certain forms of leukemia and lymphoma. 5-(3-Trifluoromethylbenzylidene)thiazolidine-2,4-dione (4a) was identified by screening to be a Pim-1 inhibitor and was found to attenuate the autophosphorylation of tagged Pim-1 in intact cells. Although 4a is a competitive inhibitor with respect to ATP, a screen of approximately 50 diverse protein kinases demonstrated that it has high selectivity for Pim kinases. Computational docking of 4a to Pim-1 provided a model for lead optimization, and a series of substituted thiazolidine-2,4-dione congeners was synthesized. The most potent new compounds exhibited IC(50)s of 13 nM for Pim-1 and 2.3 microM for Pim-2. Additional compounds in the series demonstrated selectivities of more than 2500-fold and 400-fold for Pim-1 or Pim-2, respectively, while other congeners were essentially equally potent toward the two isozymes. Overall, these compounds are new Pim kinase inhibitors that may provide leads to novel anticancer agents.

Synthesis and Evaluation of Novel Inhibitors of Pim-1 and Pim-2 Protein Kinases