Nongenotoxic 3-Nitroimidazo[1,2-<i>a</i>]pyridines Are NTR1 Substrates That Display Potent <i>in Vitro</i> Antileishmanial Activity
作者:Cyril Fersing、Louise Basmaciyan、Clotilde Boudot、Julien Pedron、Sébastien Hutter、Anita Cohen、Caroline Castera-Ducros、Nicolas Primas、Michèle Laget、Magali Casanova、Sandra Bourgeade-Delmas、Mélanie Piednoel、Alix Sournia-Saquet、Valère Belle Mbou、Bertrand Courtioux、Élisa Boutet-Robinet、Marc Since、Rachel Milne、Susan Wyllie、Alan H. Fairlamb、Alexis Valentin、Pascal Rathelot、Pierre Verhaeghe、Patrice Vanelle、Nadine Azas
DOI:10.1021/acsmedchemlett.8b00347
日期:2019.1.10
Twenty nine original 3-nitroimidazo[1,2-a]pyridine derivatives, bearing a phenylthio (or benzylthio) moiety at position 8 of the scaffold, were synthesized. In vitro evaluation highlighted compound 5 as an antiparasitic hit molecule displaying low cytotoxicity for the human HepG2 cell line (CC50 > 100 mu M) alongside good antileishmanial activities (IC50 = 1-2.1 mu M) against L. donovani, L. infantum, and L. major; and good antitrypanosomal activities (IC50 = 1.3-2.2 mu M) against T. brucei brucei and T. cruzi, in comparison to several reference drugs such as miltefosine, fexinidazole, eflornithine, and benznidazole (IC50 = 0.6 to 13.3 mu M). Molecule 5, presenting a low reduction potential (E degrees = -0.63 V), was shown to be selectively bioactivated by the L. donovani type 1 nitroreductase (NTR1). Importantly, molecule 5 was neither mutagenic (negative Ames test), nor genotoxic (negative comet assay), in contrast to many other nitroaromatics. Molecule 5 showed poor microsomal stability; however, its main metabolite (sulfoxide) remained both active and nonmutagenic, making 5 a good candidate for further in vivo studies.