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Overview
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Background
CGI-1746 is a selective and potent inhibitor of Bruton's tyrosine kinase (BTK) with IC50 value of 1.9 nM [1][2].Bruton’s tyrosine kinase (BTK) is a member of the Tec tyrosine kinase family and plays an important role in differentiation, proliferation and development of B cells. It is an attractive target for the treatment of immunological disorders such as B-cell malignancies, rheumatoid arthritis (RA), multiple sclerosis (MS) and lupus [3].CGI-1746 potently inhibits both auto- and transphosphorylation of BTK. It binds to un-phosphorylated BTK and stabilizes it in an inactive enzyme state. In cellular assays, CGI-1746 blocks BCR-mediated B-cell proliferation and suppresses the production of IL-6, IL-1βand TNF in macrophages [1]. In experimental mouse models, CGI-1746 shows a robust anti-arthritic activity [1]. In B10.RIII mice model, CGI1746 resulted in a significant inhibition (97%) of clinical arthritis scores, which were better than dexamethasone treatment (56% inhibition) [2].
[1]. Akinleye A, Chen Y, Mukhi N, et al. Ibrutinib and novel BTK inhibitors in clinical development. J Hematol Oncol, 2013, 6: 59.
[2]. Di Paolo JA, Huang T, Balazs M, et al. Specific Btk inhibition suppresses B cell- and myeloid cell-mediated arthritis. Nat Chem Biol, 2011, 7(1): 41-50.
[3]. Young WB, Barbosa J, Blomgren P, et al. Potent and selective Bruton's tyrosine kinase inhibitors: discovery of GDC-0834. Bioorg Med Chem Lett, 2015, 25(6): 1333-1337.
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