Takinib

Takinib is an inhibitor of autophosphorylated and non-phosphorylated TAK1 that binds within the ATP-binding pocket and inhibits by slowing down the rate-limiting step of TAK1 activation. At 10 μM, Takinib shows significant inhibitory activity (<10% enzyme activity after exposure) on six serine/threonine kinases, including TAK1, IRAK4, IRAK1, GCK, CLK2, and MINK1. TAK1/MAP3K7 is most potently inhibited with a half maximal inhibitory concentration (IC50) value of 9.5 nM. In cell models of rheumatoid arthritis and metastatic breast cancer, Takinib treatment results in TNF-a-dependent induction of apoptosis due to inhibition of TAK1 as a key switch between survival and cell death. Takinib does not inhibit any of the MAP2Ks or MAP3Ks family members, i.e., MKK6/MAP2K6, MEKK1/ MAP3K1, MKK1/MAP2K1. Takinib also shows no efficacy toward the TAK1-closely related MAP3K5/ASK1. Takinib potently and selectively targets TAK1 and induces apoptosis in TNF-a-stimulated breast cancer and RA in vitro models^[1].

MDA-MB-231 cells (1,000 cells/well) are seeded in a 96-well plate with 10% FBS, 5% Pen/Strep, 4g/l glucose DMEM medium. After 24h, cells are serum starved with 1% FBS, 5% Pen/Strep, 4g/l glucose DMEM medium for 4h. Cells are treated with titrations of Takinib in the presence or absence of 30 ng/mL TNFa. Plates at 0h and 24h following treatment were frozen at -80℃ after removal of media. After 24h, 100 μl ddH2O is added to each well and plates are refrozen. 1 μl from Hoechst stock [1 mg/ml in 1:4 DMSO/H2O] is dissolved in 1 ml of TNE buffer (10mM Tris, 2M NaCl, 1 mM Na2EDTA) and 100 μl of this solution is added to each well. The fluorescence is determined at 355/460 nm.

Takinib slows tumor growth in the Hodgkin lymphoma xenograft NSG mice.