2017年11月
Multi-azole-resistant strains of Cryptococcus neoformans var. grubii isolated from a FLZ-resistant strain by culturing in medium containing voriconazole
MEDICAL MYCOLOGY
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- ,
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- 巻
- 55
- 号
- 8
- 開始ページ
- 877
- 終了ページ
- 882
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1093/mmy/myw101
- 出版者・発行元
- OXFORD UNIV PRESS
A Cryptococcus neoformans var. grubii strain, NUBS14020, was the first fluconazole (FLZ)-resistant strain isolated from a feline cryptococcosis. Subsequent work demonstrated that multi-azole-resistant strains are readily isolated from FLZ-resistant strains by culturing in medium containing voriconazole (VRZ). The resulting clones were assessed for mutation and expression of known target genes, including the loci encoding lanosterol 14-alpha demethylase (ERG11), an ATP-binding cassette (ABC) transporter (AFR1), or a multidrug efflux pump (MEP); mutation and/or overexpression of these genes is known to be associated with azole resistance. We also examined the interaction between an efflux blocker (FK506, calcineurin inhibitor) and VRZ in themulti-azole-resistant strains. The ERG11 genes frommulti-azole-resistant strains encoded a protein with a G344S substitution. Expression levels of AFR1, ERG11, and MEP in the multi-azole-resistant strains were not higher than those in the VRZ-susceptible parent strain (NUBS14020) when cultured in Sabourad's dextrose broth containing VRZ. Synergistic effects between FK506 and VRC were observed in all of the multi-azole-resistant strains. The minimal inhibitory concentrations (MICs) of the combination of VRZ and FK506 in multi-azole-resistant strains were 4 to 8 times lower that the MICs of VRZ alone. To the best of our knowledge, this work represents the first report thatmulti-azole-resistant strains of C. neoformans encode a G344S substitution in Erg11p. Further investigation will be needed to determine the mechanism of multi-azole resistance in C. neoformans, given that feline cryptococcosis due to multi-azole-resistant strains is readily transmitted from cats to humans.
- リンク情報
- ID情報
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- DOI : 10.1093/mmy/myw101
- ISSN : 1369-3786
- eISSN : 1460-2709
- Web of Science ID : WOS:000412657700009