Hit-to-lead development of the chamigrane endoperoxide merulin A for the treatment of African sleeping sickness.
Hit-to-lead development of the chamigrane endoperoxide merulin A for the treatment of African sleeping sickness.
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DOI：
10.1371/journal.pone.0046172
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Linington RG
中科院分区：
文献类型：
--
作者：
Navarro G;Chokpaiboon S;De Muylder G;Bray WM;Nisam SC;McKerrow JH;Pudhom K;Linington RG
Human African trypanosomiasis (HAT) is an infectious disease with a large global health burden occurring primarily in Central and Eastern Africa. Most current treatments have poor blood brain barrier (BBB) penetration, which prevent them from targeting the most lethal stage of the infection. In addition, current therapeutics suffer from a variety of limitations ranging from serious side effects to difficulties with treatment administration. Therefore it is of crucial importance to find new treatments that are safe, affordable, and effective against both sub-species of Trypanosoma brucei. Semi-synthetic derivatization of the fungally-derived natural product merulin A (1) has led to the discovery of new development candidates for the protozoan parasite T. brucei, the causative agent of HAT. Creation of an initial SAR library based around the merulin scaffold revealed several key features required for activity, including the endoperoxide bridge, as well as one position suitable for further derivatization. Subsequent synthesis of a 20-membered analogue library, guided by the addition of acyl groups that improve the drug-like properties of the merulin A core, resulted in the development of compound 12 with an IC50 of 60 nM against T. brucei, and a selectivity index greater than 300-fold against HeLa and immortalized glial cells. We report the semi-synthetic optimization of the merulin class of endoperoxide natural products as development candidates against T. brucei. We have identified compounds with low nM antiparasitic activities and high selectivity indices against HeLa cells. These compounds can be produced economically in large quantities via a one step derivatization from the microbial fermentation broth isolate, making them encouraging lead candidates for further development.
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