Phosphatidylinositol 3-kinase (PI3K) catalyzes the phosphorylation of Pl at the 3 position to produce the second messengers PtdIns-(3,4)-P2 and PtdIns-(3,4,5)-P3. 1,2,3 PI3Kγ is a class 1B PI3K that is composed of a p110 catalytic subunit and a p101 or p84 regulatory subunit, whereas PI3Kα, β, and δ are class 1A enzymes composed of p110 and p85 subunits. AS-252424 is a potent inhibitor of phosphatidylinositol-3-kinase PI3K with selectivity for the γ isoform. It inhibits human recombinant PI3Kγ, α, β, and δ with IC50 values of 30, 940, 20,000 and 20,000 nM, respectively. AS-252424 also inhibits C5a-mediated phosphorylation of Akt in RAW 264. macrophages with an IC50 value of 0.23 µM. In a murine model of peritonitis, AS-252424 inhibited neutrophil recruitment 35% at a dose of 10 mg/kg. |
