Development of benzimidazole-based derivatives as antimicrobial agents and their synergistic effect with colistin against gram-negative bacteria
作者:Eman M.E. Dokla、Nader S. Abutaleb、Sandra N. Milik、Daoyi Li、Karim El-Baz、Menna-Allah W. Shalaby、Rawan Al-Karaki、Maha Nasr、Christian D. Klein、Khaled A.M. Abouzid、Mohamed N. Seleem
DOI:10.1016/j.ejmech.2019.111850
日期:2020.1
Gram-negative bacteria pose a distinctive risk worldwide, especially with the evolution of major resistance to carbapenems, fluoroquinolones and colistin. Therefore, development of new antibacterial agents to target Gram-negative infections is of utmost importance. Using phenotypic screening, we synthesized and tested thirty-one benzimidazole derivatives against E. coli JW55031 (TolC mutant strain). Compound 6c showed potent activity with MlC value of 2 mu g/ml, however, it lacked activity against several Gram-negative microbes with intact efflux systems, including E. coli BW25113 (wild-type strain). Combination of 6c with colistin partially restored its antibacterial activity against wild strains (MlC range, 8-16 mu g/ml against E. coli, K. pneumoniae, A. baumannii, and P. aeruginosa). 6c exhibited no cytotoxicity against two mammalian cell lines. Therefore, compound 6c represents a promising lead for further optimization to overcome Gram-negative resistance alone or in combination therapy. (C) 2019 Elsevier Masson SAS. All rights reserved.