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Anti-leishmanial, anti-inflammatory and antimicrobial activities of phenolic derivatives from Tibouchina paratropica.

Phytotherapy research : PTR (2014-11-25)
María I Tracanna, Antonio M Fortuna, Angel V Contreras Cárdenas, Alexandra K Marr, W Robert McMaster, Anaximandro Gómez-Velasco, Eugenio Sánchez-Arreola, Luis Ricardo Hernández, Horacio Bach
ABSTRACT

A new phenolic derivative, 2,8-dihydroxy-7H-furo[2,3-f]chromen-7-one (1), together with isoquercitrin (2), was isolated from the aerial parts of Tibouchina paratropica. Compound structures were elucidated by spectroscopic methods. Both compounds show antimicrobial activity towards a panel of bacterial and fungal pathogens, and compound 1 displayed potent anti-parasitic activity against Leishmania donovani (IC50  = 0.809 µg/mL). In addition, an 85% reduction in the secretion of the pro-inflammatory cytokine IL-6 was recorded when macrophages challenged with lipopolysaccharide were exposed to compound 1, but no effect on the anti-inflammatory IL-10 was observed. Compound 2 showed neither anti-parasitic nor anti-inflammatory properties. In addition, no cytotoxic activities were observed against the human-derived macrophage THP-1 cells.

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