TY - JOUR T1 - Seletalisib: Characterization of a Novel, Potent, and Selective Inhibitor of PI3K<em>δ</em> JF - Journal of Pharmacology and Experimental Therapeutics JO - J Pharmacol Exp Ther SP - 429 LP - 440 DO - 10.1124/jpet.116.237347 VL - 361 IS - 3 AU - Rodger A. Allen AU - Daniel C. Brookings AU - Mark J. Powell AU - Jean Delgado AU - Lindsay K. Shuttleworth AU - Mark Merriman AU - Ian J. Fahy AU - Roohi Tewari AU - John P. Silva AU - Louise J. Healy AU - Gareth C. G. Davies AU - Breda Twomey AU - Rona M. Cutler AU - Apoorva Kotian AU - Andrea Crosby AU - Gillian McCluskey AU - Gillian F. Watt AU - Andrew Payne Y1 - 2017/06/01 UR - http://jpet.aspetjournals.org/content/361/3/429.abstract N2 - Phosphoinositide 3-kinases (PI3K) are key signaling enzymes regulating cellular survival, development, and function. Expression of the PI3Kδ isoform is largely restricted to leukocytes and it plays a key role in immune cell development and function. Seletalisib is a novel small-molecule inhibitor of PI3Kδ that was evaluated in biochemical assays, cellular assays of adaptive and innate immunity, and an in vivo rat model of inflammation. Our findings show that seletalisib is a potent, ATP-competitive, and selective PI3Kδ inhibitor able to block protein kinase B (AKT) phosphorylation following activation of the B-cell receptor in a B-cell line. Moreover, seletalisib inhibited N-formyl peptide–stimulated but not phorbol myristate acetate–stimulated superoxide release from human neutrophils, consistent with a PI3Kδ-specific activity. No indications of cytotoxicity were observed in peripheral blood mononuclear cells (PBMCs) or other cell types treated with seletalisib. Findings from cellular assays of adaptive immunity demonstrated that seletalisib blocks human T-cell production of several cytokines from activated T-cells. Additionally, seletalisib inhibited B-cell proliferation and cytokine release. In human whole blood assays, seletalisib inhibited CD69 expression upon B-cell activation and anti-IgE-mediated basophil degranulation. Seletalisib showed dose-dependent inhibition in an in vivo rat model of anti-CD3-antibody-induced interleukin 2 release. Collectively, these data characterize seletalisib as a selective PI3Kδ inhibitor and potential therapeutic candidate for the treatment of B-cell malignancies and autoimmune diseases driven by dysregulated proinflammatory cytokine secretion. ER -