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描述 | The Janus kinases (JAK) are a class of non-receptor tyrosine kinases essential for cytokine signal transduction via the JAK/STAT pathway. BMS-911543 is a potent, selective inhibitor of JAK2 with an IC50 value of 1.1 nM. The dissociation constant (Ki) values of BMS-911543 for JAK1, JAK2 and JAK3 are 1114, 0.48 and 357 nM, respectively. BMS-911543 displayed a dose-dependent anti-proliferative effect in JAK2V617F-dependent cells such as SET2 and Ba/F3 with IC50 values of 60 and 70 nM, respectively. In Ba/FJAK2V617F cells, BMS-911543 treatment resulted in dose-dependent reduction of pSTAT5 with an IC50 value of 60 nM. In human whole-blood ex vivo assay, BMS-911543 dose-dependently inhibited TPO-stimulated pSTAT5 in human platelets. In primary hematopoetic CD34+ progenitors isolated from normal healthy volunteers, BMS-911543 inhibited EPO-mediated burst forming unit-erythroid (BFU-E) colony growth with an IC50 of approximately 1.5 μM. In cells isolated from JAK2V617F-positive MPN patient, BMS-911543 inhibited BFU-E with an IC50 of 0.3 μM in the presence of EPO compared with an IC50 of 0.075 μM in EPO-independent erythroid colony formation. A single oral dose of 30 mg/kg BMS-911543 in PD-PK mouse model fully inhibited pSTAT5 induction at 1 – 18h post treatment. In athymic mice xenografted with SET2 cells, 10 mg/kg BMS-911543 demonstrated 90 – 100% pSTAT5 inhibition up to 7h post dose. In a mouse model of antigen-induced antibody production, BMS-911543 at 10 and 30 mg/kg resulted in 65% and 85% reduction, respectively, in the level of IgG antibody[4]. | ||
作用机制 | BMS-911543 is a selective ATP-competitive inhibitor of JAK2[4]. |
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1mg | 5mg | 10mg | |
1 mM 5 mM 10 mM |
2.31mL 0.46mL 0.23mL |
11.56mL 2.31mL 1.16mL |
23.12mL 4.62mL 2.31mL |
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