IPI-3063

Human recombinant PI3K-α, PI3K-β, PI3K-δ, and PI3K-γ are used. Phosphatidylinositol 4,5 bis phosphate (diC8-PtdIns(4,5)P2) is used. PI3K-α, β, and δ are heterodimers consisting of full length p110α, p110β, or p110δ catalytic subunit and the p85α regulatory subunit. PI3K-γ is a monomer of the p110γ catalytic subunit. Samples of kinase (10 nM-α, β, and δ; 20 nM-γ) are incubated with IPI-3063 for 30 min at room temperature in reaction buffer (15 mM HEPES pH 7.4, 20 mM NaCl, 1 mM EGTA, 0.02% Tween 20, 10 mM MgCl₂, 0.2 mg/mL bovine-γ-globulins) followed by addition of ATP/diC8-PtdIns(4,5)P2 mixture to give final concentrations of 3 mM ATP and 500 µM diC8-PtdIns(4,5)P2. Reactions are incubated at room temperature for 2 h, with PI3K activity is assessed. Plates are read on plate reader in luminescence mode^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Peripheral blood mononuclear cells (PBMCs) are first purified from blood by density gradient centrifugation. Human B cells are then purified from PBMCs by negative selection. B-cell purity is increased from 4% to >70% as measured by FACS analysis using anti-CD19 PE conjugated antibody. Purified B cells are seeded at a final concentration of 0.1×10⁶ cells/mL and cultured with 2 µg/mL human CD40L+5 µg/mL anti-human IgM/IgG+100 µg/mL hIL-2+100 µg/mL hIL-21. All B cells are cultured in RPMI 1640 supplemented with 10% (vol/vol) heat-inactivated FCS, 5 mM Hepes, 2 mM L-glutamine, 100 U/mL Penicillin, 100 µg/mL Streptomycin, 50 µM 2-mercaptoethanol. Purified human B cells are pretreated with IPI-3063 (0.1, 1, 10, and 100 nM) for 30 min, then stimulated with human CD40L+anti-human IgM/IgG+human IL-2+human IL-21 for 120 h^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.