A cell-permeable, orally bioavailable pyrimidinediamino compound with anti-inflammatory and anti-tumor properties. Acts as a potent, reversible and ATP-competitive inhibitor of Syk kinase (IC50 = 41nM; Ki = 30nM). Exhibits high selectivity over a broad panel of other protein kinases (˜300nM), ion channels, and enzymes. Blocks Syk-dependent FcR-mediated activation of monocytes/macrophages, and neutrophils and inhibits Anti-IgE-mediated degranulation in cultured human mast cells (EC50 = 56nM as measured by tryptase release). At higher concentrations, it is shown to block adenosine A3 receptors, adenosine transporter, and monoamine transporter (IC50 = 81nM, 1.84uM, and 2.74uM, respectively), and Flt3 autophosphorylation. Shown to reduce immune complex-mediated inflammation in murine models (˜10mg/kg) and diminish airway hyper-responsiveness in asthma models.
Solubility:DMSO
Primary Target:Syk kinase
Primary Target Ki:30nM
Storage and Stability:May be stored at 4°C. For long-term storage, aliquot and store at 4°C. Do not freeze. For maximum recovery of product, centrifuge the original vial prior to removing the cap. Further dilutions can be made in assay buffer.