Journal of Antimicrobial Chemotherapy, Vol 42, 747-753, Copyright © 1998 by The British Society for Antimicrobial Chemotherapy
S Maesaki, P Marichal, MA Hossain, D Sanglard, H Vanden Bossche and S Kohno
We investigated the effects of combining tacrolimus and azole antifungal
agents in azole-resistant strains of Candida albicans by comparing the
accumulation of [3H]itraconazole. The CDR1-expressing resistant strain C26
accumulated less itraconazole than the CaMDR- expressing resistant strain
C40 or the azole-sensitive strain B2630. A CDR1-expressing Saccharomyces
cerevisiae mutant, DSY415, showed a marked reduction in the accumulation of
both fluconazole and itraconazole. A CaMDR-expressing S. cerevisiae mutant,
DSY416, also showed lower accumulation of fluconazole, but not of
itraconazole. The addition of sodium azide, an electron-transport chain
inhibitor, increased the intracellular accumulation of itraconazole only in
the C26 strain, and not in the C40 or B2630 strains. Addition of
tacrolimus, an inhibitor of multidrug resistance proteins, resulted in the
highest increase in itraconazole accumulation in the C26 strain. The
combination of itraconazole and tacrolimus was synergic in azole- resistant
C. albicans strains. In the C26 strain, the MIC of itraconazole decreased
from >8 to 0.5 mg/L when combined with tacrolimus. Our results showed
that two multidrug resistance phenotypes (encoded by the CDR1 and CaMDR
genes) in C. albicans have different substrate specificity for azole
antifungal agents and that a combination of tacrolimus and azole antifungal
agents is effective against azole-resistant strains of C. albicans.
Synergic effects of tactolimus and azole antifungal agents against azole-resistant Candida albican strains [In Process Citation]
The Second Department of Internal Medicine, Nagasaki University School of Medicine, Japan.
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