Azole resistance in Candida spp. isolated from Catú Lake, Ceará, Brazil: an efflux-pump-mediated mechanism
Braz. j. microbiol
;
47(1): 33-38, Jan.-Mar. 2016. tab, graf
Article
in English
| LILACS
| ID: lil-775105
ABSTRACT
Abstract Since, there is no study reporting the mechanism of azole resistance among yeasts isolated from aquatic environments; the present study aims to investigate the occurrence of antifungal resistance among yeasts isolated from an aquatic environment, and assess the efflux-pump activity of the azole-resistant strains to better understand the mechanism of resistance for this group of drugs. For this purpose, monthly water and sediment samples were collected from Catú Lake, Ceará, Brazil, from March 2011 to February 2012. The obtained yeasts were identified based on morphological and biochemical characteristics. Of the 46 isolates, 37 were Candida spp., 4 were Trichosporon asahii, 3 were Cryptococcus laurentii, 1 Rhodotorula mucilaginosa, and 1 was Kodamaea ohmeri. These isolates were subjected to broth microdilution assay with amphotericin B, itraconazole, and fluconazole, according to the methodology standardized by the Clinical and Laboratory Standards Institute (CLSI). The minimum inhibitory concentrations (MICs) of amphotericin B, itraconazole, and fluconazole were 0.03125–2 µg/mL, 0.0625 to ≥16 µg/mL, and 0.5 to ≥64 µg/mL, respectively, and 13 resistant azole-resistant Candida isolates were detected. A reduction in the azole MICs leading to the phenotypical reversal of the azole resistance was observed upon addition of efflux-pump inhibitors. These findings suggest that the azole resistance among environmental Candida spp. is most likely associated with the overexpression of efflux-pumps.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Azoles
/
Candida
/
Lakes
/
Drug Resistance, Fungal
/
Antifungal Agents
Type of study:
Practice guideline
/
Prognostic study
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Braz. j. microbiol
Journal subject:
Microbiology
Year:
2016
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Ceará/BR
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