Discovery of 2-[1-(4,4-Difluorocyclohexyl)piperidin-4-yl]-6-fluoro-3-oxo-2,3-dihydro-1<i>H</i>-isoindole-4-carboxamide (NMS-P118): A Potent, Orally Available, and Highly Selective PARP-1 Inhibitor for Cancer Therapy
作者:Gianluca Papeo、Helena Posteri、Daniela Borghi、Alina A. Busel、Francesco Caprera、Elena Casale、Marina Ciomei、Alessandra Cirla、Emiliana Corti、Matteo D’Anello、Marina Fasolini、Barbara Forte、Arturo Galvani、Antonella Isacchi、Alexander Khvat、Mikhail Y. Krasavin、Rosita Lupi、Paolo Orsini、Rita Perego、Enrico Pesenti、Daniele Pezzetta、Sonia Rainoldi、Federico Riccardi-Sirtori、Alessandra Scolaro、Francesco Sola、Fabio Zuccotto、Eduard R. Felder、Daniele Donati、Alessia Montagnoli
DOI:10.1021/acs.jmedchem.5b00680
日期:2015.9.10
The nuclear protein poly(ADP-ribose) polymerase-1 (PARP-1) has a well-established role in the signaling and repair of DNA and is a prominent target in oncology, as testified by the number of candidates in clinical testing that unselectively target both PARP-1 and its closest isoform PARP-2. The goal of our program was to find a PARP-1 selective inhibitor that would potentially mitigate toxicities arising from cross-inhibition of PARP-2. Thus, an HTS campaign on the proprietary Nerviano Medical Sciences (NMS) chemical collection, followed by SAR optimization, allowed us to discover 2-[1-4,4-difluorocyclohexyl)piperidin-4-yl] -6-fluoro-3-oxo-2,3-dihydro-1H-isoindole-4-carboxamide (NMS-P118, 20by). NMS-P118 proved to be a potent, orally available, and highly selective PARP-1 inhibitor endowed with excellent ADME and pharmacokinetic profiles and high efficacy in vivo both as a single agent and in combination with Temozolomide in MDA-MB-436 and Capan-1 xenograft models, respectively. Cocrystal structures of 20by with both PARP-1 and PARP-2 catalytic domain proteins allowed rationalization of the observed selectivity.