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PND-1186 is a reversible inhibitor of FAK (focal adhesion kinase) with IC50 value of 1.5 nM [1].

The cytoplasmic protein-tyrosine kinase FAK is associated with integrins and growth factor receptors. It modulates a variety of cellular processes when it is activated. Since the elevated expression of FAK is found in many tumors, the inhibitors of FAK are developed as anti-tumor drugs in cancer therapy. PND-1186 is one of these ATP-competitive small-molecule inhibitors. It inhibited the autophosphorylation of FAK tyrosine-397 with IC50 value of 0.1 μM in breast carcinoma cells. When the concentration was up to 1 μM, PND-1186 also inhibited more than 50% of the activities of other kinases, such as CDK2, Lck, Aurora-A and ACK1 [1].

PND-1186 at concentrations of 0.1 to 1 μM inhibited the phosphorylation of FAK Tyr-397 and increased the protein level of FAK in murine breast carcinoma 4T1 cells, ID8 ovarian carcinoma cells and human MD-MBA-231 cells. Meanwhile, PND-1186 significantly induced cell apoptosis and increased the cleavage caspase 3 in suspended but not adherent 4T1 cells. Besides that, PND-1186 is found to inhibit the movement of 4T1 cells in both the wound healing assays and the millicell chamber motility assays. Treatment of PND-1186 at 0.4 μM for 4 hours showed the maximal inhibition of about 60%. In HEY ovarian cancer cells, treatment of PND-1186 caused the decrease of pY397 FAK, β5 integrin and osteopontin. It also induced cell cycle arrest at G0-G1 phase [1, 2].

In subcutaneous 4T1 tumors, administration of PND-1186 at dose of 100 mg/kg caused inhibition of both FAK Tyr-397 phosphorylation and p130Cas Tyr-410 phosphorylation. In orthotopic 4T1 tumors, administration of 150 mg/kg PND-1186 for 16 days finally reduced 3.1-fold tumor volume. Moreover, PND-1186 is reported to have anti-inflammatory effects and can suppress the processes of spontaneous breast cancer metastasis to lung [3].

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