Molecule

Description

Cancer

Description

AT7867 is a potent ATP-competitive inhibitor of Akt1, Akt2 and Akt3 with IC50 of 32 nM, 17 nM and 47 nM, respectively.

Targets

IC₅₀

In Vitro

AT7867 also inhibits structurally related AGC kinases p70S6K and PKA with IC50 of 20 nM and 85 nM, respectively. AT7867 shows ATP-competitive activity to Akt2 with K_i of 18 nM. AT7867 exhibits antiproliferation in cell lines with PTEN or PIK3CA mutations and shows great potent to MES-SA, MDA-MB-468, MCF-7, HCT116 and HT29 with IC50 of 0.94 μM, 2.26 μM, 1.86 μM, 1.76 μM and 3.04 μM, respectively. AT7867 also suppresses the cell growth of U87MG, PC-3 and DU145 cells with IC50 of 8.22 μM, 10.37 μM and 11.86 μM, respectively. AT7867 suppresses Akt activity by inhibiting phosphorylation of GSK-3β in human tumor cells with IC50 of 2-4 μM. AT7867 also induces the phosphorylation of the following Akt direct substrates including proapoptotic transcription factors FKHR (FoxO1a), FKHRL1 (FoxO3a) and the downstream target S6RP in U87MG cells. ^[1]

In Vivo

AT7867 shows bioavailability of 44% in mice by p.o. route. AT7867 could increase the cleaved PARP in MES-SA xenografts at 20 mg/kg i.p. or 90 mg/kg p.o.. AT7867 significantly inhibits the tumor growth in MES-SA xenografts or U87MG xenografts with T/C of 0.37 and 0.51, respectively. ^[1]

Clinical Trials

Features

In vitro kinase assays

Kinase assays for Akt2, PKA, p70S6K, and CDK2/cyclin A are all carried out in a radiometric filter binding format. Assay reactions are set up in the presence of AT7867. For Akt2, the Akt2 enzyme and 25 μM Aktide-2T peptide (HARKRERTYSFGHHA) are incubated in 20 mM MOPS (pH 7.2), 25 mM β-glycerophosphate, 5 mM EDTA, 15 mM MgCl₂, 1 mM sodium orthovanadate, 1 mM DTT, 10 μg/mL bovine serum albumin, and 30 μM ATP (1.16 Ci/mmol) for 4 hours. For PKA, the PKA enzyme and 50 μMpeptide (GRTGRRNSI) are incubated in 2 mM MOPS (pH 7.2), 25 mM β-glycerophosphate, 5 mM EDTA, 15 mM MgCl₂, 1 mM orthovanadate, 1 mM DTT, and 40 μM ATP (0.88 Ci/mmol) for 20 minutes. For p70S6K, the p70S6K enzyme and 25 μMpeptide substrate (AKRRRLSSLRA) are incubated in 10 mM MOPS (pH 7), 0.2 mM EDTA, 1 mM MgCl₂, 0.01% β-mercaptoethanol, 0.1 mg/mL bovine serum albumin, 0.001% Brij-35, 0.5% glycerol, and 15 μM ATP (2.3 Ci/mmol) for 60 min. For CDK2, the CDK2/cyclin A enzyme and 0.12 μg/mL histone H1 are incubated in 20 mM MOPS (pH 7.2), 25 mM β-glycerophosphate, 5 mM EDTA, 15 mM MgCl₂, 1 mM sodium orthovanadate, 1 mM DTT, 0.1 mg/mL bovine serum albumin, and 45 μM ATP (0.78 Ci/mmol) for 4 hours. Assay reactions are stopped by adding an excess of orthophosphoric acid, and the stopped reaction mixture is then transferred to Millipore MAPH filter plates and filtered. The plates are then washed, scintillant is added, and radioactivity is measured by scintillation counting on a Packard TopCount. IC50 values are calculated from replicate curves using GraphPad Prism software. Akt1 and Akt3 enzyme assays are carried out.

Cell Lines

MES-SA, MDA-MB-468, MCF-7, HCT116, HT29, U87MG, PC-3 and DU145 cells

Concentrations

0-100 μM , dissolved to a 10 mM stock in DMSO

Incubation Time

72 hours

Methods

Cells are plated in 96-well microplates at 5 × 10³ per well in medium supplemented with 10% fetal bovine serum and grown for 24 hours before treatment with AT7867. AT7867 or vehicle control is added to the cells for 72 hours. Following this, Alamar Blue solution is added. The IC50 value for AT7868 is calculated in GraphPad Prism using nonlinear regression analysis and a sigmoidal dose-response (variable slope) equation.

Animal Models

Human MES-SA uterine sarcoma cells or U87MG human glioblastoma cells are injected s.c. in the right flank of BALB/c mice.

Formulation

Formulated in a vehicle containing 10% DMSO, 20% water, and 70% hydroxypropyl-β-cyclodextrin (25% aqueous, w/v)

Doses

20 mg/kg (i.p.) or 90 mg/kg (p.o.) once every 3 days

Administration

Administered via i.p. or p.o.