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Nedisertib (M3814) is a potent and selective inhibitor of DNA-dependent Protein Kinase (DNA-PK), with an IC50 of <3 nM.

Nedisertib (Compound 136) is a potent and selective inhibitor of DNA-PK, with an IC50 of <3 nM for DNA-PK and <0.5 μΜ for cellular pDNA-PK[3].

In combination with IR, Nedisertib shows efficacy in all of the 6 mouse models of human cancer. In all models, a dose of 2 Gy administered daily for 1 week in combination with Nedisertib induces statically significant tumor growth inhibition compare to IR alone. Nedisertib, alone or in combination with IR, does not induce significant weight loss or visual signs of toxicity in the mice in any study[1].

The efficacy of Nedisertib in combination with IR is evaluated in 6 human xenograft models (HCT116, FaDu, NCI-H460, A549, Capan-1, BxPC3) in mice representing 4 different cancer types (colon, head and neck, lung, and pancreas). Tumor cells are injected s.c. into nude mice, and treatment starts when palpable tumors are established (~100 to 200 mm3 ). Nedisertib is given orally at different doses (25 to 300 mg/kg) 10 min prior to IR. IR is applied using a radiation therapy device for small rodents calibrated to deliver 2 Gy. Autophosphorylation of DNA-PK (serine2056 ) in FaDu tumor lysates is measured by immunoassay to assess pharmacological inhibition by Nedisertib[1].

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