Cayman Syk Inhibitor II (hydrochloride)

Spleen tyrosine kinase (Syk) is a non-receptor tyrosine kinase that, upon phosphorylation, binds to immunoreceptor tyrosine-based activation motifs of FcRγ chains and mediates downstream signaling related to platelet function and inflammation. Syk inhibitor II is a cell-permeable, pyrimidine-carboxamide compound that selectively and reversibly blocks Syk (IC₅₀ = 41 nM) in an ATP-competitive manner.¹ It is much less potent against PKCε, PKCβII, ZAP-70, Btk, and Itk (IC₅₀s = 5.1, 11, 11.2, 15.5, and 22.6 µM, respectively).¹ Syk inhibitor II has been shown to prevent FcεRI-mediated 5-HT release in RBL-2H3 cells in vitro (IC₅₀ = 460 nM) and to inhibit passive cutaneous anaphylaxis reactions in mice (ID₅₀ = 13.2 mg/kg, s.c.).¹

WARNING This product is not for human or veterinary use.