The antifungal activity of KB425796-A against several fungi is shown in Table 4.
KB425796-A exhibited potent antifungal activity against A. fumigatus and a variety of micafungin-resistant fungal species Trichosporon asahii, Rhizopus oryzae, Pseudallescheria boydii and Cryptococcus neoformans, with particularly high efficiency against T. asahii, but was inactive againstCandida albicans.
Microscopic observation of A. fumigatus cells after treatment with KB425796-A revealed several morphological changes, including swelling and bulging of hyphae, in comparison with the micafungin-treated hyphae and untreated control hyphae.
The cytotoxicity (IC50) of KB425796-A for EL-4 cells was 450mgml1.