NVP-BSK805 is a selective, ATP-competitive (Ki = 0.43 nM) Janus kinase 2 (JAK2) inhibitor (IC50 = 0.58 and 0.56 nM against full-length wild-type and V617F JAK2, respectively) with greatly reduced potency against TYK2, JAK3, JAK1 (IC50 = 10.76, 18.68, 31.63 nM against respective JAK homology domain 1) and >300-fold selectivity over a panel of 36 other kinases. BSK805 potently inhibits STAT5 phosphorylation (by >90% at 100 nM; MB-02 & SET-2 cells) and proliferation in JAK2V617F mutant cultures in vitro (GI50= 39-331 nM; 75% SET-2 growth inhibition at 150 nM) and in Ba/F3 JAK2V617F-bearing mice in vivo (150 mg/kg p.o.). BSK805 daily oral administration is also efficacious against rhEpo-induced splenomegaly and polycythemia in mice (50-100 mg/kg) and rats (25-50 mg/kg) with good pharmacokinetics and oral avilability.
Orally available, ATP-competitive Janus kinase 2 (JAK2) inhibitor with efficacy against JAK2V617F-driven leukemic disease in mice and rats in vivo.
The JAK/STAT pathway is an attractive target for breast cancer therapy due to its frequent activation, and clinical trials evaluating JAK inhibitors (JAKi) in advanced breast cancer are ongoing. Using patient biopsies and preclinical models of breast cancer, we demonstrate
Assumptions that liver immune cells and immunosuppressive pathways are similar to their counterparts in other spaces have led to gaps in our understanding of intrahepatic neoplasm aggressiveness. Myeloid-derived suppressor cells (MDSCs) are potent inhibitors of antitumor immunity and pose a
Using a three-dimensional coculture model, we identified significant subtype-specific changes in gene expression, metabolic, and therapeutic sensitivity profiles of breast cancer cells in contact with cancer-associated fibroblasts (CAF). CAF-induced gene expression signatures predicted clinical outcome and immune-related differences in the
Molecular cancer therapeutics, 9(7), 1945-1955 (2010-07-01)
The recent discovery of an acquired activating point mutation in JAK2, substituting valine at amino acid position 617 for phenylalanine, has greatly improved our understanding of the molecular mechanism underlying chronic myeloproliferative neoplasms. Strikingly, the JAK2(V617F) mutation is found in
We have designed and synthesized a novel series of 2,8-diaryl-quinoxalines as Janus kinase 2 inhibitors. Many of the inhibitors show low nanomolar activity against JAK2 and potently suppress proliferation of SET-2 cells in vitro. In addition, compounds from this series
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