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ANTIMICROBIAL AGENTS AND CHEMOTHERAPY |
1,2Department of Dermatology and Allergology1 and Department of Periodontology2, University of Munich, Frauenlobstr. 9-11, D-80337 München, Germany 3Robert Koch-Institut, Berlin, Germany
Correspondence Martin Schaller Martin.Schaller{at}lrz.uni- muenchen.de
Received 16 August 2002 Accepted 20 November 2002
The inhibitory effect of human immunodeficiency virus (HIV) proteinase inhibitors amprenavir and saquinavir and antifungal agents terbinafine, ketoconazole, amphotericin B and ciclopiroxolamine on aspartyl proteinases (Saps) secreted by Candida albicans was tested in an in vitro spectophotometric assay. As expected, both HIV proteinase inhibitors showed a significant inhibitory effect on Sap activity, which was comparable to that of the classical aspartyl proteinase inhibitor pepstatin A (P < 0.001). Antifungal drugs such as ketoconazole, terbinafine and amphotericin B had no, or only minor, inhibitory effects on proteolytic activity. In contrast, a significant reduction in Sap activity could be demonstrated during treatment with the antifungal agent ciclopiroxolamine (P < 0.001). These results point to a multiple effect of this antimycotic agent and might explain the reduced adherence of C. albicans to human epithelial cells at subinhibitory doses.
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