tcsc0080 Dactolisib

BEZ235 is a dual pan-class I PI3K and mTOR kinase inhibitor with IC₅₀s of 4 nM/5 nM/7 nM/75 nM, and 20.7 nM for p110α/p110γ/p110δ/p110β and mTOR, respectively. BEZ235 inhibits both mTORC1 and mTORC2.

IC50 & Target: IC50: 4 nM (p110α), 5 nM (p110γ), 7 nM (p110δ), 75 nM (p110β), 20.7 nM (mTOR)^[1]


mTORC1, mTORC2^[1]

In Vitro: BEZ235 (NVP-BEZ235) potently inhibits PI3K in an ATP Competitive Manner. NVP-BEZ235 (250 nM) significantly reduced the phosphorylation levels of the mTOR activated kinase p70S6K. NVP-BEZ235 also leads to a reduction of S235/S236P-RPS6 levels with an IC₅₀ of 6.5 nM, suggesting that NVP-BEZ235 can directly inhibit the mTOR kinase, as the kinase domain of mTOR is highly homologous to the one of class IA PI3K. The activity of NVP-BEZ235 against mTOR is confirmed using a biochemical mTOR K-LISA assay (IC₅₀, 20.7 nM)^[1]. The IC₅₀s of NVP-BEZ235 for HCT116, DLD-1, and SW480 cell lines are 14.3±6.4, 9.0±1.5, and 12.0±1.6 nM, respectively^[2].

In Vivo: BEZ235 (NVP-BEZ235) (45 mg/kg, p.o.) treatment induces colonic tumor regression in a GEM model for sporadic PIK3CA wild-type CRC^[2]. NVP-BEZ235 (45 mg/kg) is administered to MENX rats (n=2 each group) by oral gavage and animals are sacrificed 1 or 6 hours after treatment. Immunostains for P-AKT and P-S6 show considerable reduction of the two proteins, and particularly of P-S6, 6 hours after administration of NVP-BEZ235 when compares with PEG-treated rats. At 6 hours after treatment, the pituitary adenomas of NVP-BEZ235-treated rats has a proteomic profile significantly different from the tumors of placebo-treated rats^[3].