Influence of pH and concentration on the postantifungal effect and on the effects of sub-MIC concentrations of 4 antifungal agents on previously treated Candida spp.
This study investigates the impact of different pH values (5.5 and 7.4) on the postantifungal effect (PAFE) and the effect of sub-MIC concentrations (1/4 x MIC) on C. albicans and C. glabrata in the PAFE stage (PAFSE). The PAFE stage was induced by a 1.5 h pretreatment with different doses (1, 4 and 8 x MIC) of 4 antifungal agents. An increase in the pH and/or an increase in the dose of the antimycotic prolonged the duration of the PAFE induced by amphotericin B or 5-fluorocytosine and the PAFSE induced by all 4 antifungal agents in both species. 5-Fluorocytosine and amphotericin B (except for treatment with 1 x MIC at pH 5.5) induced significant PAFEs (0.5-3.0 h and 1.4-4.8 h, respectively), which were increased (to 0.9-3.2 h and 0.8-3.4 h, respectively) by posterior (PLEASE EXPLAIN WHAT YOU MEAN BY THE WORD "POSTERIOR" HERE) exposure to 1/4 X MIC of the respective antifungal agent. Although ketoconazole and fluconazole were not able to induce significant PAFEs, posterior exposure to 1/4 x MIC of each of these 2 azoles led to significant PAFSEs of up to 2.6 h in both yeast species when the concentrations and pH were high enough.
García
M T
MT
Department of Microbiology, School of Medicine, Universidad Complutense, Madrid, Spain.
Llorente
M T
MT
Mínguez
F
F
Prieto
J
J
D000666:Amphotericin B / Q000008:administration & dosage / Q000494:pharmacology; D000935:Antifungal Agents / Q000008:administration & dosage / Q000494:pharmacology*; D002175:Candida / Q000187:drug effects*; D002177:Candidiasis / Q000188:drug therapy*; D025141:Drug Resistance, Fungal; D015725:Fluconazole / Q000008:administration & dosage / Q000494:pharmacology; D005437:Flucytosine / Q000008:administration & dosage / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007654:Ketoconazole / Q000008:administration & dosage / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D013997:Time Factors
D000935:Antifungal Agents; D000666:Amphotericin B; D015725:Fluconazole; D005437:Flucytosine; D007654:Ketoconazole