%0 Journal Article 
%A de Sousa, Gilberto
%A Lim, William Gustavo
%A dos Santos, Flávio José
%A Macías Domínguez, Francisco Antonio
%A González Molinillo, José María
%A Gonçalves Teixeira-Neto, Rafael
%A de Siqueira, João Máximo
%A da Silva, Eduardo Sérgio
%T Toxicity and Anti-promastigote Activity of Benzoxazinoid Analogs Against Leishmania (Viannia) braziliensis and Leishmania (Leishmania) infantum
%D 2020
%@ 2228-5881

%U http://hdl.handle.net/10498/22223
%X Purpose: Here, we aim to evaluate the antileishmanial activity of compounds with a benzoxazinoid (BX) skeleton, previously synthesized by our group, against Leishmania (Viannia) braziliensis and Leishmania (Leishmania) infantum promastigotes.

Methods: Anti-promastigote activity, as well as cytotoxicity, were determined using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) colorimetric assays. The selectivity index (SI) for each compound was calculated using a ratio of the cytotoxicity of compounds and the geometric mean (GM) of antileishmanial concentrations to each species tested. The comparisons between groups were carried out using a t test or analysis of variance (one-way ANOVA). A P value of less than 0.05 was considered significant.

Results: All the compounds tested were active, with IC50 falling between 92 +/- 6.19 mu g/mL and 238 +/- 6.57 mu g/mL for L. braziliensis, and 89 +/- 6.43 mu g/mL and 188 +/- 3.58 mu g/mL against L. infantum. Bex2, Bex3, Pyr1, Pyr2, and Pyr4 were compounds that showed activity similar to the drug Glucantime (R), exhibited low cytotoxicity against splenic hamster cells (CC50 raging between >400 and 105.7 +/- 2.26 mu g/mL) and had favorable selectivity indices (SI 1.12 to 3.96).

Conclusion: The analogs in question are promising prototypes for the pharmaceutical development of novel, safer and more effective leishmanicidal agents.
%K Benzoxazinone core
%K Leishmanicidal agents
%K Neglected disease
%K Pharmacology
%K Pyridoxazinone core
%K Splenic hamster cells
%~ Universidad de Cádiz