A-674563

A-674563 is a potent selective Akt1 (Protein Kinase B) inhibitor. A-674563 also shows inhibitory activity against PKA and CDK2 with IC50 values of 16nM and 46nM respectively. A-674563 has a significant effect on depolarization of purkinje fiber in an in vitro assay, and severe CV toxicity (e.g. hypotension) in vivo. A-674563 induced Akt blockade results in decreased STS cell downstream target phosphorylation and tumor cell growth inhibiton. A-674563 (0-30 µM) reduces the phosphorylation of GSK3α/β, TSC2, mTOR, and ribosomal protein S6 in a dose-dependent fashion in MiaPaCa-2 cells in vitro. Furthermore, A-674563 inhibits hERG ion channels in vitro and causes acute hypotension in vivo. A674563-treated (20 mg/kg/bid, p.o.) mice exhibits slower tumor growth and more than 50% decrease in the tumor volume at the termination of the study compared with that in control group.