J Med Microbiol International Journal of Systematic and Evolutionary Microbiology
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J Med Microbiol 55 (2006), 259-262; DOI: 10.1099/jmm.0.46263-0
© 2006 Society for General Microbiology
ISSN 0022-2615

Catalase activity in Candida albicans exposed to antineoplastic drugs

Carlos E. B. Linares1, Deizi Griebeler2, Denise Cargnelutti1, Sydney H. Alves3, Vera M. Morsch1 and Maria R. C. Schetinger1

Departamento de Química, Centro de Ciências Naturais e Exatas1 , Departamento de Análises Clínicas e Toxicológicas, Centro de Ciências da Saúde2 and Departamento de Microbiologia, Centro de Ciências da Saúde3 , Universidade Federal de Santa Maria, Av. Roraima, 97105-900. Santa Maria, RS, Brazil

Correspondence
Maria R. C. Schetinger
mariarosa{at}smail.ufsm.br

Received 27 July 2005
Accepted 10 November 2005

An increased catalase activity in Candida spp. has been suggested as a mechanism that reduces amphotericin B activity. Furthermore, resistance to antifungal agents like amphotericin B has been reported in some cancer patients undergoing chemotherapy treatment. In this study we analysed the influence of chemotherapy agents on catalase activity in Candida albicans, the major species involved in yeast infections. Eight strains of C. albicans isolated from HIV-positive patients were exposed to cyclophosphamide, cytarabine, dacarbazine and methotrexate antineoplastic drugs at the concentrations used during therapy. Catalase activity was measured and compared to the control group. Very significant differences (P<0·01) were found when C. albicans was exposed to methotrexate (2 µg ml–1=4 µM). For cyclophosphamide (50 µg ml–1), cytarabine (1 µg ml–1) and dacarbazine (8 µg ml–1), no differences were found (P>0·05) between the control and drug-exposed groups. Although more extensive studies are necessary, these data do suggest that the antineoplastic drug methotrexate contributes to the resistance to antifungal drug therapy by varying catalase activity.






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