WAY-600 is a potent, ATP-competitive, and selective mTOR inhibitor with an IC₅₀ of 9 nM for recombinant mTOR enzyme. WAY-600 blocks mTOR complex 1/2 (mTORC1/2) assemble and activation. IC50 & Target: IC50: 9 nM (mTOR)^[1]
mTORC1/2^[2] In Vitro: WAY-600 exhibits a concentration-dependent and time-dependent inhibition of f HepG2 and Huh-7 cells viability. Following WAY-600 (1-1000 nM) treatment, the number of HepG2 cell colonies is dramatically decreased. Meanwhile, BrdU incorporation in HepG2 cells is also inhibited with WAY-600 treatment. WAY-600 dose-dependently increases the activity of caspase-3 and caspase-9 in HepG2 cells. WAY-600 disrupts assemble of mTORC1 (mTOR-Raptor association) and mTORC2 (mTOR-Rictor association). Activation of mTORC1 (indicated by p-S6K1 and p-4E-BP1) and mTORC2 is almost blocked by WAY-600 (100 nM)^[2]. In Vivo: Administration of WAY-600 (10 mg/kg, daily) inhibits HepG2 tumor growth in nude mice. Daily HepG2 tumor growth of WAY-600-administrated mice is significantly lower than that of vehicle control mice. Importantly, the in vivo anti-cancer activity by WAY-600 is further potentiated with the co-administration of MEK-162 (2.5 mg/kg, p.o. daily)^[2].