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Leishmania mexicana promastigote and intracellular amastigote growths were inhibited by the water-soluble furan-2-carboxamide issued from the pharmacophore 2-amino-4,6-dimethylpyridine with IC50 values of 69 +/- 2 and 89 +/- 9 microM, respectively. This compound was also tested against established L. mexicana infection in susceptible BALB/c mice; an intraperitoneal administration of 10 mg/Kg/day during five consecutive days induced a high reduction in the amastigote burden of the poplitea lymph node (81 +/- 6.4%), the spleen (80 +/- 1.6%) and the liver (73 +/- 9%). Approach of the mechanism of antileishmanial activity of this compound, assessed by the flow cytometry, showed a reduction in the protein and DNA synthesis. Finally, an actual increase of the in vitro antileishmanial activity was obtained by replacement of the amidic function by an imidazolidin-2-one moiety. In this new series, two of the N-substituted derivatives showed IC50 values of 13 +/- 0.5 and 7 +/- 3 microM in intracellular amastigotes constituting new promising compounds for further studies.

In vitroandin vivoantileishmanial activity of 2-amino-4,6-dimethylpyridine derivatives againstLeishmania mexicana