AS-605240 is a selective PI3K γ inhibitor with an IC50 of 8 nM. [1]

PI3Ks are a family of enzymes, which phosphorylate the 3’- OH position of the inositol ring of phosphoinositides.They have been divided into three classes on the basis of structural features and in vitro lipid substrate specificity. The three class-Ia PI3-kinases (p110 α / β / δ ) and the sole class-Ib PI 3-kinase (p110 γ ) couple growth factor receptors and G-protein-coupled receptors, respectively, to a wide range of downstream pathways. Signal transduction via the PI3K/Akt pathway is essential for regulating cellular responses, including proliferation, survival, migration, motility and tumorigenesis, in a variety of cell types. The key selectivity features were identified by co-crystallization with PI3Kγ, which revealed that thiazolidinedione nitrogen makes a salt – bridge interaction with the side chain of Lys-833, and also forms the link to Val-882.[1,2]

AS-605240 is a cell permeable inhibitor for PI3Ks and inhibits p110 α/β/γ/δ in vitro?with IC50 values of 0.06, 0.27, 0.008 0.3 μΜ, respectively. AS-605240 was tested its ability to inhibit C5a-mediated PKB phosphorylation in RAW264 mouse macrophages and AS-605240 showed an IC50 of 0.09 mM. [1]

As in many in?ammatory processes, neutrophils are predominant in the initial in?ux of leukocytes, followed by monocytes-macrophages and lymphocytes. in vivo efficacy in blocking leukocyte migration assays were conducted, AS-605240 was tested in two different mouse models of peritonitis, including RANTES-induced or thioglycollate, the outcome showed ED50 of 9.1 mg/kg and 10 mg/kg respectively. AS-605240 also show that it is an orally active, selective PI3Kγ inhibitor suppresses joint inflammation and damage in a mouse model of collagen-induced arthritis.[1]

References:[1].  Camps M, Rückle T, Ji H, et al. Blockade of PI3Kγ suppresses joint inflammation and damage in mouse models of rheumatoid arthritis[J]. Nature medicine, 2005, 11(9): 936-943.[2].  Marone R, Cmiljanovic V, Giese B, et al. Targeting phosphoinositide 3-kinase—moving towards therapy[J]. Biochimica et Biophysica Acta (BBA)-Proteins and Proteomics, 2008, 1784(1): 159-185.