Abstract
Current drugs for treating leishmaniasis are still associated with significant toxicity and failure rates. Thus, new effective and less toxic antileishmanial agents are still in need. Herein, we tested a series of sulfonamide 4-methoxychalcone derivatives against L. amazonensis promastigote and amastigote forms to identify its antileishmanial profile against this species compared to L. braziliensis. In addition, we used molecular modeling tools to determine stereoelectronic features that may lead to the antileishmanial profile. Interestingly, all tested compounds were able to affect L. amazonensis promastigote form in a concentration-dependent manner and with low cytotoxicity, except for derivative 3g. However, our results showed that compound 3f (para-Cl) presents the best profile against both L. amazonensis forms (promastigote and amastigote), differently from that observed for L. braziliensis, when compound 3i was the most active. Structure–activity relationship (SAR) analysis of these derivatives pointed molecular volume, HOMO density, and conformational aspects as important characteristics for parasitic profile. Overall, sulfonamide 4-methoxychalcone derivatives may be pointed out not only as lead compounds for treating leishmaniasis (i.e., 3f) but also as experimental tools presenting parasite-selectivity (i.e., 3i).
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The authors thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico/CNPq (Brazil), Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and Universidade Federal Fluminense (UFF) for the financial support.
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Souza, A.M.T., Castro, H.C., Brito, M.A. et al. Leishmania amazonensis Growth Inhibitors: Biological and Theoretical Features of Sulfonamide 4-Methoxychalcone Derivatives. Curr Microbiol 59, 374–379 (2009). https://doi.org/10.1007/s00284-009-9447-2
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DOI: https://doi.org/10.1007/s00284-009-9447-2