Homologous acetylenic acetogenins from Porcelia macrocarpa RE (Fries) displayed potent activity against amastigotes from Trypanosoma cruzi

Autor(es)

Brito, Ivanildo A. ; Levatti, Erica V. Castro ; Regasini, Luis O. ; Ferreira, Edgard A. ; Lopes, Flavia B. ; Fernandes, Joao Paulo S. ; Batista Jr, Joao M. ; Tempone, Andre G. ; Lago, Joao Henrique G.

• Tipo de documento: Artigo Científico
• Fonte: Phytochemistry; v. 231, p. 10-pg., 2024-12-17.

Resumo

As part of our continuous study on the Annonaceae species Porcelia macrocarpa, in the present work, eight chemically related 2-alkyl-3-hydroxy-4-methyl-gamma-lactones (1-8) were isolated. Their structures were characterised by NMR, MS, and VCD. Their antitrypanosomal activity was evaluated in vitro against intracellular amastigotes with EC50 values ranged from 13.9 to 1.1 mu M for compounds 1-3 and 6-8, while compounds 4 and 5 were inactive (EC50 > 100 mu M). Compounds 1-8 did not exert toxicity against NCTC cells at the highest tested concentration (CC50 > 200 mu M). Compared with the standard drug benznidazole (EC50 = 3.6 mu M and SI > 54.6), compound 8 proved to be the most potent gamma-lactone with an EC50 of 1.1 mu M and an SI of >181.8. Finally, the structure-activity relationship analysis suggested that flexibility and length of side chain of the related gamma-lactones 1-8 play an important role in the activity against amastigotes. The results contribute to the discovery of new molecular prototypes that can be used as scaffolds for developing drugs to treat Chagas disease. (AU)

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