RO4929097 is a potent and selective γ-secretase inhibitor with IC50 value of 4nM for γ-secretase enzyme assay, as well as EC50 values of 14nM and 5nM for Aβ40 and Notch processing in engineered cell lines, respectively. As γ-secretase is the key component of the enzymatic complex cleaving and activating NOTCH, RO4929097 can also inhibit NOTCH signaling indirectly. Treatment with RO4929097 dose-dependently suppressed the production of intracellular Notch at concentration ranging in 0.1-5μM for 5 days, reduced the expression of the downstream Notch target Hes1 at concentration ranging in 0.1-1μM for 24h, and producd a less transformed morphology in A549 cells. Orally administration of RO4929097 at dose of 3, 10, 30 and 60mg/kg, qd, for 14 days achieved tumor growth inhibition by 66%, 77%, 79% and 88% in the A549 xenograft model. Treatment with 60 mg/kg RO4929097 twice daily with the 7+/14- schedule for a 21-day cycle achieved tumor growth inhibition by 91%. Inhibition of tumor growth remained prolonged and sustained up to 34 days post-treatment with reduced expression of several key angiogenic genes tested.
搜索
