Dual Mechanism of Action of 5-Nitro-1,10-Phenanthroline against Mycobacterium tuberculosis
作者:Saqib Kidwai、Chan-Yong Park、Shradha Mawatwal、Prabhakar Tiwari、Myung Geun Jung、Tannu Priya Gosain、Pradeep Kumar、David Alland、Sandeep Kumar、Avinash Bajaj、Yun-Kyung Hwang、Chang Sik Song、Rohan Dhiman、Ill Young Lee、Ramandeep Singh
DOI:10.1128/aac.00969-17
日期:2017.11
New chemotherapeutic agents with novel mechanisms of action are urgently required to combat the challenge imposed by the emergence of drug-resistant mycobacteria. In this study, a phenotypic whole-cell screen identified 5-nitro-1,10-phenanthroline (5NP) as a lead compound. 5NP-resistant isolates harbored mutations that were mapped to fbiB and were also resistant to the bicyclic nitroimidazole PA-824
迫切需要具有新颖作用机制的新型化学治疗剂,以应对耐药性分枝杆菌的出现所带来的挑战。在这项研究中,表型全细胞筛选确定了5-硝基-1,10-菲咯啉(5NP)为先导化合物。耐5NP的分离株具有映射到fbiB的突变,并且对双环硝基咪唑PA-824也具有抗性。机理研究证实5NP以F420依赖性方式被激活,导致形成1,10-菲咯啉和1,10-菲咯啉-5胺作为细菌中的主要代谢产物。有趣的是,5NP还通过诱导巨噬细胞自噬而杀死了天然抗性细胞内细菌。结构活性关系研究表明,硝基对于体外活性至关重要,而类似物3-甲基-6-硝基-1 设计了与5NP相比具有改善的体外活性和体内功效的10-菲咯啉。这些发现表明,除了针对结核分枝杆菌的直接作用机制外,5NP还调节宿主机制杀死细胞内病原体。