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NVP-BSK805 dihydrochloride is a potent and selective quinoxaline JAK2 inhibitor with IC50 values of 0.48, 0.56 and 0.58 nM for JAK2 JH1, FL JAK V617F and FL JAK2 wt respectively. Within the JAK family, NVP-BSK805 displays more than 20-fold selectivity towards JAK2 in vitro, as well as excellent selectivity in broader kinase profiling. The compound blunts constitutive STAT5 phosphorylation in JAK2(V617F)-bearing cells, with concomitant suppression of cell proliferation and induction of apoptosis. In vivo, NVP-BSK805 exhibited good oral bioavailability and a long half-life. The inhibitor was efficacious in suppressing leukemic cell spreading and splenomegaly in a Ba/F3 JAK2(V617F) cell-driven mouse mechanistic model. Furthermore, NVP-BSK805 potently suppressed recombinant human erythropoietin-induced polycythemia and extramedullary erythropoiesis in mice and rats.
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Source | Acta Haematol (2014). Figure 4. NVP-BSK805 |
| Method | Western blot | |
| Cell Lines | SET-2 and HEL cell line | |
| Concentrations | 0.01, 0.05, 0.1, 0.5, 1.0 μM | |
| Incubation Time | 24 h | |
| Results | The JAK2-positive cell line SET-2 showed suppression of STAT5a phosphorylation already at a concentration of 0.1 μ M of NVP-BSK805 and NVP-BVB808, whereas in HEL cells higher concentrations |
| Molecular Weight | 563.47 |
| Formula | C27H28F2N6O.2HCl |
| CAS Number | 1942919-79-0 |
| Solubility (25°C) | DMSO 60 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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| Momelotinib (CYT387)
Momelotinib (CYT387) is a small-molecule, ATP-competitive JAK1/JAK2 inhibitor with IC50 of 11 and 18 nM respectively. |
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| WP1130
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