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Xanthochymol and garcinol, isoprenylated benzophenones purified fromGarcinia xanthochymus fruits, showed multiple activities againstCandida albicans biofilms. Both compounds effectively prevented emergence of fungal germ tubes and were also cytostatic, with MICs of 1 to 3 μM. The compounds therefore inhibited development of hyphae and subsequent biofilm maturation. Xanthochymol treatment of developing and mature biofilms induced cell death. In early biofilm development, killing had the characteristics of apoptosis, including externalization of phosphatidyl serine and DNA fragmentation, as evidenced by terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling (TUNEL) fluorescence. These activities resulted in failure of biofilm maturation and hyphal death in mature biofilms. In mature biofilms, xanthochymol and garcinol caused the death of biofilm hyphae, with 50% effective concentrations (EC50 s) of 30 to 50 μM. Additionally, xanthochymol-mediated killing was complementary with fluconazole against mature biofilms, reducing the fluconazole EC50 from &gt;1,024 μg/ml to 13 μg/ml. Therefore, xanthochymol has potential as an adjuvant for antifungal treatments as well as in studies of fungal apoptosis.

Garcinia xanthochymus Benzophenones Promote Hyphal Apoptosis and Potentiate Activity of Fluconazole against Candida albicans Biofilms