Antifungal and cytotoxicity activities of the fresh xylem sap of Hymenaea courbaril L. and its major constituent fisetin.

Abstract

BACKGROUND:

The great potential of plants as Hymenaea courbaril L (jatoba) has not yet been throughly explored scientifically and therefore it is very important to investigate their pharmacological and toxicological activities to establish their real efficacy and safety. This study investigated the cytotoxicity of xylem sap of Hymenaea courbaril L and its bioactivity against the fungi Cryptococcus neoformans species complex and dermatophytes.

METHODS:

The fresh xylem sap of H. courbaril was filtered resulting in an insoluble brown color precipitate and was identified as fisetin. In the filtrate was identified the mixture of fisetinediol, fustin, 3-O-methyl-2,3-trans-fustin and taxifolin, which were evaluated by broth microdilution antifungal susceptibility testing against C. neoformans species complex and dermatophytes. The fresh xylem sap and fisetin were screened for cytotoxicity against the 3T3-A31 cells of Balb/c using neutral red uptake (NRU) assay.

RESULTS:

The fresh xylem sap and the fisetin showed higher in vitro activity than the filtrate. The xylem sap of H. courbaril inhibited the growth of dermatophytes and of C. neoformans with minimal inhibition concentration (MIC) < 256 μg/mL, while the fisetin showed MIC < 128 μg/mL for these fungi. Fisetin showed lower toxicity (IC50 = 158 μg/mL) than the fresh xylem sap (IC50 = 109 μg/mL).

CONCLUSION:

Naturally occurring fisetin can provide excellent starting points for clinical application and can certainly represent a therapeutic potential against fungal infections, because it showed in vitro antifungal activity and low toxicity on animal cells.

• Authors: Maysa Paula da Costa, Marize Campos Valadares Bozinis, Wanessa Machado Andrade, Carolina Rodrigues Costa, Alessandro Lopes da Silva, Cecília Maria Alves de Oliveira, Lucília Kato, Orionalda de Fátima Lisboa Fernandes, Lúcia Kioko Hasimoto Souza, Maria do Rosário Rodrigues Silva
• Journal: BMC complementary and alternative medicine (BMC Complement Altern Med) Vol. 14 Pg. 245 (Jul 16 2014) ISSN: 1472-6882 [Electronic] England
• PMID: 25027026 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antifungal Agents
• Flavonoids
• Flavonols
• fisetin

Topics

• Animals
• Antifungal Agents (chemistry, isolation & purification, pharmacology)
• Arthrodermataceae (drug effects)
• Cell Line
• Cryptococcus neoformans (drug effects)
• Flavonoids (chemistry, isolation & purification, pharmacology)
• Flavonols
• Hymenaea (chemistry)
• Mice
• Microbial Sensitivity Tests
• Xylem (chemistry)