JAC Advance Access originally published online on January 13, 2008
Journal of Antimicrobial Chemotherapy 2008 61(3):577-585; doi:10.1093/jac/dkm493
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Original research |
In vitro interaction between azoles and cyclosporin A against clinical isolates of Candida albicans determined by the chequerboard method and time–kill curves
1 Department of Pharmacy, Shandong Provincial Qianfoshan Hospital, Jinan, Shandong Province, People's Republic of China 2 School of Pharmaceutical Sciences, Shandong University, Jinan, Shandong Province, People's Republic of China 3 The General Surgical Central Laboratory of Shandong Provincial Qianfoshan Hospital, Jinan, Shandong Province, People's Republic of China
Received 20 July 2007; returned 19 October 2007; revised 3 October 2007; accepted 23 November 2007
* Corresponding author. Tel: +86-531-89268366; Fax: +86-531-82961267; E-mail: sunshujuan888{at}163.com
Objectives: To investigate the in vitro interaction between three azoles (fluconazole, itraconazole and voriconazole) and cyclosporin A against five azole-susceptible (azole-S) and five azole-resistant (azole-R) clinical Candida albicans isolates.
Methods: By using a chequerboard technique and time–kill curves, synergistic, indifferent or antagonistic effects when drugs were used in combination were assessed. In the chequerboard assay, the antifungal activity of drug combinations was determined by the microdilution method based on the CLSI M27-A2 guidelines. The effects of the interactions were assessed by two non-parametric approaches (fractional inhibitory concentration index model and 
E model). In the time–kill assay, a colony counting method was employed against one azole-S strain and one azole-R strain at 0, 6, 12, 24 and 48 h of incubation at 35°C.
Results: Good concordance was found between the chequerboard method and time–kill curves. Indifference or synergism was observed for azole-S isolates in interactions of azoles and cyclosporin A, while strong synergism was observed for azole-R isolates in all drug combinations.
Conclusions: Cyclosporin A showed potent synergism when combined with the three azoles, especially against azole-R C. albicans strains, and there was good agreement between various methods used in this study.
Keywords: microdilution , spectrophotometric method , non-parametric approaches , colony counting
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