FD223 is a potent, selective phosphoinositide 3-kinase delta (PI3Kδ) inhibitor with a marked affinity (IC50=1 nM), demonstrating notable selectivity against other isoforms (IC50s: α=51 nM, β=29 nM, γ=37 nM). This compound effectively suppresses the proliferation of acute myeloid leukemia (AML) cell lines by inhibiting p-AKT Ser473, thereby inducing G1 phase cell cycle arrest. FD223 holds promise for leukemia research, particularly in AML[1].

PI3Kα:51 nM (IC50), PI3Kβ:29 nM (IC50), PI3Kγ:37 nM (IC50), PI3Kδ:1 nM (IC50)

FD223 exhibits notable anti-proliferative activities in the p110δ-positive AML cell lines HL-60, MOLM-16, EOL-1 and KG-1, with the IC50 of 2.25 μM, 0.87 μM, 2.82 μM, and 5.82 μM, respectively. FD223 shows weak anti-proliferative activity against p110δ unexpressed MM.1R cell line, with the IC50 value of 23.13 μM[1].FD223 (MOLM-16 cells; 0.1-5 μM; 16 hours) dose-dependently reduces phosphorylation of Akt (Ser473), which is consistent with the positive control Idelalisib, illustrating that the activity of PI3K/Akt pathway in MOLM-16 cell is blocked[1].FD223 (MOLM-16 cells; 24 hours; 1-5 μM) arrests the cell cycle at the G1 phase similar to that of positive control Idelalisib[1].FD223 (1-5 μM; 48 hours) dose-dependently induces cellular apoptosis[1].

FD223 (20 and 40 mg/kg; p.o, per day for 14 consecutive days) displays potent antitumor efficacy in MOLM-16 xenograft model with the tumor volume reduction of 49% at a dose of 40 mg/kg/day (po), and shows no significant toxicity in the preliminary safety assessment[1].FD223 (i.v.; dose of 2 mg/kg; p.o.; 10 mg/kg rats) shows a moderate plasma clearance rate after intravenous administration with C =0.191 L?h-1?kg-1. In the po route, it shows a half-life (t1/2) of 3.74 h and a Cmax of 1104 ng/mL, good oral plasma exposures (AUC0-∞>9000 h?ng/mL) and acceptable oral bioavailability (17.6%)[1].