syk in 4

Syk-IN-4 is a potent, selective, and orally bioavailable inhibitor of SYK, with an IC50 of 0.31 nM, targeting SYK, a potential therapeutic target for autoimmunity and hematological cancers[1].

1. Glaucocalyxin A (Leukamenin F)-SBE-β-CD could be useful with a better solubility and sustained function in drug delivery. 2. Glaucocalyxin A activates caspase-3, decreases BAD phosphorylation, and reduces the expression of X-linked inhibitor of apoptosis protein. 3. Glaucocalyxin A inhibits Akt phosphorylation, suppresses proliferation, and promotes apoptosis in a dose-dependent manner, but not in normal glial cells. 4. Glaucocalyxin A inhibits collagen-stimulated tyrosine phosphorylation of Syk, LAT, and phospholipase Cγ2, the signaling events in collagen receptor GPⅥ pathway. 5. Glaucocalyxin A could potentially be developed as an antiplatelet and antithrombotic agent, can inhibit platelet p-selectin secretion and integrin activation by convulxin, is a GPVI selective ligand.

Gusacitinib, also known as ASN-002 and EN-3351, is a potent dual inhibitor of SYK JAK kinases. ASN002 showed strong antitumor activity in both hematological and solid tumor xenograft models. ASN002 strongly suppressed the SYK and JAK family kinase signaling pathways as measured in pLAT and pSTAT assays, respectively. When profiled in a panel of 178 cell lines, ASN002 showed strong anti-proliferative activity in many lymphoid leukemia cell lines, including SU-DHL-6, SU-DHL-4, OCI-LY10, H929 and Pfeiffer.

Streptochlorin is a bacterial metabolite originally isolated from Streptomyces sp. SF2583 that has diverse biological activities, including antiangiogenic, antiproliferative, and anti-allergic properties. It inhibits TNF-α-induced NF-κB transcriptional activity and decreases proliferation of human umbilical vein endothelial cells (HUVECs) when used at concentrations ranging from 5 to 20 μM. Streptochlorin (12 μg/ml) decreases viability of, as well as induces apoptosis and increases the production of reactive oxygen species (ROS) in, Hep3B human hepatocellular carcinoma cells. It does not induce cytotoxicity in RBL-2H3 mast cells at concentrations up to 100 μM. Streptochlorin prevents degranulation in antigen-stimulated mast cells, as well as inhibits Syk kinase and the Src family kinases LYN and Fyn and reduces the secretion of TNF-α and IL-4 induced by dinitrophenyl-human serum album (DNP-HSA) in RBL-2H3 mast cells. It also decreases swelling and reduces scratching behavior in a mouse model of allergic dermatitis induced by dinitrofluorobenzene (DNFB).

TAS05567 is a potent, highly selective, and ATP-competitive Syk inhibitor (IC50: 0.37 nM), showing >70% inhibition of Syk and four other kinases [FLT3 (IC50: 10 nM), JAK2 (IC50: 4.8 nM), KDR (IC50: 600 nM), RET (IC50: 29 nM)] in a panel of 192 kinases.