title: β-Aescin at subinhibitory concentration (sub-MIC) enhances susceptibility of Candida glabrata clinical isolates to nystatin.
abstract: Aescin (escin) derived from the seeds of horse chestnut (Aesculus hippocastanum L.) is a natural mixture of triterpene saponins exhibiting a wide variety of pharmacological properties, including antiinflammatory, analgesic, and antipyretic activities. However, data concerning antifungal activities of these compounds are limited. This study aims to evaluate the in vitro antifungal susceptibility of Candida glabrata clinical isolates to α-aescin sodium, β-aescin crystalline and β-aescin sodium using the disk diffusion (DD) and broth microdilution (BMD) methods. Moreover, the influence of subinhibitory concentration (0.5×MIC) of β-aescins on the nystatin MIC was also studied. In general, the results obtained by the DD assay correlated well with those obtained by the BMD method. Both β-aescins effectively inhibited the growth of all 24 strains tested. The minimum inhibitory concentration (MIC) values ranging from 8 to 32 μg/ml for β-aescin crystalline, whereas those of β-aescin sodium were slightly lower and ranged from 4 to 16 μg/ml. In contrast, α-aescin sodium was found to be completely ineffective against the strains studied. MIC values of nystatin were reduced 2-16-fold and 2-4-fold in the presence of subinhibitory concentration of β-aescin crystalline and β-aescin sodium, respectively. Results of the present study may suggest the additive interaction between β-aescin and nystatin.
authors.affiliation: Department of Microbiology roman.franiczek@umed.wroc.pl.
authors.forename: Roman
authors.initials: R
authors.lastname: Franiczek
authors.affiliation: Department of Pharmacognosy, Wroclaw Medical University, Wroclaw, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Gleńsk
authors.affiliation: Department of Microbiology.
authors.forename: Barbara
authors.initials: B
authors.lastname: Krzyżanowska
authors.affiliation: Department of Pharmacognosy, Wroclaw Medical University, Wroclaw, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Włodarczyk
mesh_terms: D000935:Antifungal Agents / Q000494:pharmacology*; D041221:Candida glabrata / Q000187:drug effects* / Q000254:growth & development / Q000302:isolation & purification; D002177:Candidiasis / Q000382:microbiology; D004357:Drug Synergism; D004928:Escin / Q000494:pharmacology*; D006801:Humans; D008826:Microbial Sensitivity Tests; D009761:Nystatin / Q000494:pharmacology*
chemical_list: D000935:Antifungal Agents; D009761:Nystatin; D004928:Escin
keywords: Candida glabrata; aescin; minimum inhibitory concentration; nystatin