AS-604850 is a selective and ATP-competitive PI3Kγ inhibitor (IC50= 2.5 μM), with over 30-fold selectivity for PI3Kδ and PI3Kβ, and 18-fold selectivity over PI3Kα. [1]

PI3K (phosphatidylinositol-4,5-bisphosphate 3-kinase) is a family of enzymes involved in cellular functions such as cell growth, proliferation, differentiation, motility, survival and intracellular trafficking, which in turn are involved in cancer. It plays a key role in PI3K/Akt(PKB)/mTOR pathway.

In rat hepatocytes, AS-604850 pretreatment abolished GCDC-induced phosphorylation of Akt by 50% and inhibited apoptosis by reducing GCDC/TCDC/TLC-induced caspase-3 cleavage. [2] In PI3KCG-/-monocytes and THP-1 (human monocytic cell line), AS-604850 inhibited the PKB phosphorylation activated by MCP-1, it also blocked the MCP-1-mediated chemotaxis in a concentration dependent manner. In RAW264 mouse macrophages, C5a-mediated PKB phosphorylation was inhibited by AS-604850. [1]

In the thioglycollate-induced peritonitis model that induced multiple chemokine in vivo, oral administration of 10 mg/kg AS-604850 showed a 31% decrease of neutrophil recruitment. [1]

References:
1.  Camps M, Rückle T, Ji H et al. Blockade of PI3K-gamma suppresses joint inflammation and damage in mouse models of rheumatoid arthritis. Nat Med. 2005 Sep;11(9):936-43.
2.  Hohenester S, Gates A, Wimmer R et al. Phosphatidylinositol-3-kinase p110γ contributes to bile salt-induced apoptosis in primary rat hepatocytes and human hepatoma cells. J Hepatol. 2010 Nov;53(5):918-26.