Neef, James, Hollingworth, Greg, Hall, Edward, Wuersch, Kuno, Lal, Ajay, Bellenie, Ben, Bruce, Ian, Spendiff, Matthew, Culshaw, Andrew, McDonald, Sara, Ambarkhane, Ameet, Chinn, Colin, Thomas, Matthew , Sarah , Marshall, Rosner, Elisabeth, Bracher, Marguerite , Nicklin, Paul , Marshall, Stephen , Coote, Julie , Cullen, Eva and Tessier, Clemence (2021) Discovery and Toxicological Profiling of Aminopyridines as Orally Bioavailable Selective Inhibitors of PI3-Kinase γ. Journal of Medicinal Chemistry. ISSN 15204804

Abstract

Using a novel physiologically relevant in vitro human whole blood neutrophil shape change assay, an aminopyrazine series of selective PI3Kγinhibitors was identified and prioritized for further optimization. Severe solubility limitations associated with the series leading to low oral bioavailability and poor exposures, especially at higher doses, were overcome by moving to an aminopyridine core. Compound 33, with the optimal balance of on-target activity, selectivity, and pharmacokinetic parameters, progressed into in vivo studies and demonstrated good efficacy (10 mg/kg) in a rat model of airway inflammation. Sufficient exposures were achieved at high doses to support toxicological studies, where unexpected inflammatory cell infiltrates in cardiovascular tissue prevented further compound development.

Item Type:	Article
Date Deposited:	12 Oct 2021 00:45
Last Modified:	12 Oct 2021 00:45
URI:	https://oak.novartis.com/id/eprint/44381