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Antimicrobial Agents and Chemotherapy, October 1998, p. 2584-2589, Vol. 42, No. 10
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Rapid, Transient Fluconazole Resistance in
Candida albicans Is Associated with Increased mRNA Levels
of CDR
Kieren A.
Marr,1,2,*
Christopher
N.
Lyons,3
Tiger
Rustad,2
Raleigh A.
Bowden,1,2,4 and
Theodore C.
White3,5
Departments of
Medicine,1
Pediatrics,4 and
Pathobiology,5
University of
Washington, Fred Hutchinson Cancer Research
Center,2 and
Seattle Biomedical Research
Institute,3 Seattle, Washington
Received 2 April 1998/Returned for modification 13 May
1998/Accepted 29 June 1998
Fluconazole-resistant Candida albicans, a cause of
recurrent oropharyngeal candidiasis in patients with human
immunodeficiency virus infection, has recently emerged as a cause of
candidiasis in patients receiving cancer chemotherapy and marrow
transplantation (MT). In this study, we performed detailed molecular
analyses of a series of C. albicans isolates from an MT
patient who developed disseminated candidiasis caused by an
azole-resistant strain 2 weeks after initiation of fluconazole
prophylaxis (K. A. Marr, T. C. White, J. A. H. vanBurik, and R. A. Bowden, Clin. Infect. Dis. 25:908-910, 1997).
DNA sequence analysis of the gene (ERG11) for the azole
target enzyme, lanosterol demethylase, revealed no difference between
sensitive and resistant isolates. A sterol biosynthesis assay revealed
no difference in sterol intermediates between the sensitive and
resistant isolates. Northern blotting, performed to quantify mRNA
levels of genes encoding enzymes in the ergosterol biosynthesis pathway
(ERG7, ERG9, and ERG11) and genes
encoding efflux pumps (MDR1, ABC1,
YCF, and CDR), revealed that azole resistance
in this series is associated with increased mRNA levels for members of
the ATP binding cassette (ABC) transporter superfamily, CDR
genes. Serial growth of resistant isolates in azole-free media resulted
in an increased susceptibility to azole drugs and corresponding
decreased mRNA levels for the CDR genes. These results
suggest that C. albicans can become transiently resistant
to azole drugs rapidly after exposure to fluconazole, in association
with increased expression of ABC transporter efflux pumps.
*
Corresponding author. Mailing address: Fred Hutchinson
Cancer Research Center, 1100 Fairview Ave. N. D3-100, Seattle, WA
98109. Phone: (206) 667-2995. Fax: (206) 667-4411. E-mail:
kmarr{at}u.washington.edu.
Antimicrobial Agents and Chemotherapy, October 1998, p. 2584-2589, Vol. 42, No. 10
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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