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Antileishmanial Activities of (Z)-2-(Nitroimidazolylmethylene)-3 (2H)-Benzofuranones: Synthesis, in Vitro Assessment, and Bioactivation by Ntr 1 and 2 Publisher Pubmed



Navidpour L1 ; Lima ML2 ; Milne R2 ; Wyllie S2 ; Hadjesfandiari N1 ; Choudhary MI3 ; Khan S3 ; Yousuf S3
Authors

Source: Antimicrobial Agents and Chemotherapy Published:2022


Abstract

The antileishmanial activity of a series of (Z)-2-(heteroarylmethylene)-3(2H)- benzofuranone derivatives, possessing 5-nitroimidazole or 4-nitroimidazole moieties, was investigated against Leishmania major promastigotes and some analogues exhibited prominent activities. Compounds with IC50 values lower than 20 mM were further examined against L. donovani axenic amastigotes. Evaluated analogues in 5-nitroimidazole subgroup demonstrated significantly superior activity (;17-88-folds) against L. donovani in comparison to L. major. (Z)-7-Methoxy-2-(1-methyl-5-nitroimidazole-2-ylmethylene)-3 (2H)-benzofuranone (5n) showed the highest L. donovani anti-axenic amastigote activity with IC50 of 0.016 mM. The cytotoxicity of these analogues was determined using PMM peritoneal mouse macrophage and THP-1 human leukemia monocytic cell lines and high selectivity indices of 26 to 431 were obtained for their anti-axenic amastigote effect over the cytotoxicity on PMM cells. Further studies on their mode of action showed that 5-nitroimidazole compounds were bioactivated predominantly by nitroreductase 1 (NTR1) and 4-nitroimidazole analogues by both NTR1 and 2. It is likely that this bioactivation results in the production of nitroso and hydroxylamine metabolites that are cytotoxic for the Leishmania parasite. © 2022 American Society for Microbiology.
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