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BMS-911543 is a selective small-molecule inhibitor of JAK2 with IC50 value of 1.1nM [1].

BMS-911543 is a reversible pyrrolopyridine ATP-competitive JAK2 inhibitor with a high selectivity. In the in vitro assay using human recombinant JAK enzyme, BMS-911543 displays an IC50 value of 1.1nM against JAK2 and the Ki value is 0.48nM. The inhibition activity and affinity against JAK2 are both much higher than those against JAK1 and JAK3. Besides that, BMS-911543 also has efficacy against other kinases, such as Lyn and the c-FMS receptor tyrosine kinase. In JAK-dependent cells such as SET2 or Ba/F3, the treatment of BMS-911543 causes an anti-proliferative effect with IC50 values of 60 and 70nM, respectively. The cell lines depending on other JAK family members do not show significant anti-proliferative response to BMS-911543. The colony growth assays prove that BMS-911543 can suppress the growth of MPN patient-derived cells and is more potent in the JAK2V617F pathway compared with the JAK2WT pathway. BMS-911543 is also found to be potent in vivo in both the JAK2WT pathway and the JAK2V617F pathway through suppressing pSTAT5 induction [1].

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