期刊
ACS MEDICINAL CHEMISTRY LETTERS
卷 10, 期 1, 页码 34-39出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmedchemlett.8b00347
关键词
Leishmania ssp; imidazopyridine; nitroaromatic; nitroreductases; Ames test; comet assay
资金
- Aix-Marseille Universite
- Universite de Toulouse
- CNRS
- Wellcome Trust [WT105021]
- Universite Paul Sabatier
- Conseil Regional Occitanie
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.
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