Paradoxical effect of caspofungin: reduced activity against Candida albicans at high drug concentrations.
Resistance problems with caspofungin, an echinocandin inhibitor of fungal cell wall glucan synthesis, have been rare. We noted paradoxical turbid growth of Candida albicans isolates in broth in some high (supra-MIC) concentrations. Among isolates submitted for susceptibility testing and screened at drug concentrations up to 12.5 microg/ml, the frequency was 16%. Analysis of the turbid growth indicated slowing of growth in the presence of drug but with numbers of CFU up to 72% those of drug-free controls. Clearing of growth again by the highest drug concentrations produced a quadriphasic pattern in a tube dilution series. Cells growing at high drug concentrations were not resistant on retesting but showed the paradoxical effect of the parent. Among a selected series of isolates tested at concentrations up to 50 microg/ml, an additional 53% showed a "mini-paradoxical effect": no turbid growth but incomplete killing at high concentrations (supra-minimum fungicidal concentration). These effects were reproducible; medium dependent in extent; noted in macro- and microdilution, in the presence or absence of serum, and on agar containing drug (but not when drug concentrations were not constant, as in agar diffusion); not seen with other echinocandins and less commonly in other Candida species; and not due to destruction of drug in tubes showing the effect. Cooperative enhancement of inhibition by a second drug could eradicate the effect. We postulate that high drug concentrations derepress or activate resistance mechanisms. The abilities of subpopulations to survive at high drug concentrations could have in vivo consequences.
Stevens
David A
DA
Department of Medicine, Santa Clara Valley Medical Center, 751 S. Bascom Ave., San Jose, CA 95128-2699, USA. stevens@stanford.edu
Espiritu
Marife
M
Parmar
Rachana
R
D000935:Antifungal Agents / Q000494:pharmacology*; D002176:Candida albicans / Q000187:drug effects*; D002177:Candidiasis / Q000382:microbiology; D000077336:Caspofungin; D015169:Colony Count, Microbial; D003470:Culture Media; D004305:Dose-Response Relationship, Drug; D025141:Drug Resistance, Fungal; D054714:Echinocandins; D023381:Endpoint Determination; D005656:Fungal Proteins; D006801:Humans; D055666:Lipopeptides; D008826:Microbial Sensitivity Tests; D010455:Peptides / Q000494:pharmacology*; D010456:Peptides, Cyclic; D010641:Phenotype
D000935:Antifungal Agents; D003470:Culture Media; D054714:Echinocandins; D005656:Fungal Proteins; D055666:Lipopeptides; D010455:Peptides; D010456:Peptides, Cyclic; C007572:echinocandin B; D000077336:Caspofungin