Ponatinib

2 years -80 in solvent

Oral gavage once daily

Ba/F3 cells expressing Bcr-Abl or a range of single mutations in the kinase domain of Bcr-Abl

0-625 nM

Dissolved in 25 mM citrate buffer, pH 2.75

AP24534 potently inhibits native Abl, AblT315I, and other clinically important Abl kinase domain mutants with IC50 of 0.30 nM–2 nM. AP24534 doesn't inhibit Aurora kinase family members, nor does it inhibit insulin receptor or CDK2/cyclin E. AP24534 inhibits proliferation of Ba/F3 cells expressing Bcr-Abl with IC50 of 0.5 nM, as well as Ba/F3 cells expressing a range of Bcr-Abl mutants with IC50 of 0.5 nM–36 nM. The inhibition of proliferation by AP24534 is correlated with induction of apoptosis. [1-2] In leukemic cell lines containing activated forms of FLT3, KIT, FGFR1, and PDGFRalpha receptors, AP24534 potently inhibits receptor phosphorylation and cellular proliferation with IC50 of 0.3 nM to 20 nM. In MV4-11 (FLT3-ITD(+/+)) but not RS4, 11 (FLT3-ITD(–/–)) AML cells, AP24534 inhibits FLT3 signaling and induced apoptosis at less than 10 nM. AP24534 inhibits viability of primary leukemic blasts from a FLT3-ITD positive AML patient with IC50 of 4 nM but not those from patients with AML expressing nati [3] In Ba/F3 cells engineered to express activated FGFR1-4, AP24534 potently inhibits FGFR-mediated signaling and viability with IC50 lower than 40 nM. In cell lines representing multiple tumor types (endometrial, bladder, gastric, breast, lung, and colon), and containing FGFRs dysregulated by a variety of mechanisms, AP24534 inhibits FGFR-mediated signaling with IC50 less than 40 nM and inhibits cell growth with IC50 of 7 nM–181 nM. [4]

72 hours

Ba/F3 cell lines are distributed in 96-well plates (4x103 cells/well) and incubated with AP24534 for 72 hours. Proliferation is measured using a methanethiosulfonate (MTS)-based viability assay (CellTiter96 Aqueous One Solution). All values are normalized to the control wells with no drug. IC50 values are reported as the mean of three independent experiments performed in quadruplicate.

Ponatinib is a novel, potent multi-target inhibitor of Abl, PDGFRα, VEGFR2, FGFR1 and Src with IC50 of 0.37 nM, 1.1 nM, 1.5 nM, 2.2 nM and 5.4 nM in cell-free assays, respectively. Ponatinib (AP24534) inhibits autophagy.