Increases in SLT2 expression and chitin content are associated with incomplete killing of Candida glabrata by caspofungin.
نویسندگان
چکیده
Incomplete killing was observed for caspofungin against Candida glabrata, which was associated with increased SLT2 expression and elevated chitin content. In contrast, fungicidal activity and no chitin increase were observed in an isogenic Delta slt2 strain, suggesting a role for SLT2 and chitin production in the response of C. glabrata to caspofungin.
منابع مشابه
Elevated chitin content reduces the susceptibility of Candida species to caspofungin.
The echinocandin antifungal drugs inhibit synthesis of the major fungal cell wall polysaccharide β(1,3)-glucan. Echinocandins have good efficacy against Candida albicans but reduced activity against other Candida species, in particular Candida parapsilosis and Candida guilliermondii. Treatment of Candida albicans with a sub-MIC level of caspofungin has been reported to cause a compensatory incr...
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Anidulafungin, caspofungin, and micafungin killing activities against Candida glabrata, Candida bracarensis, and Candida nivariensis were evaluated by the time-kill methodology. The concentrations assayed were 0.06, 0.125, and 0.5 μg/ml, which are achieved in serum. Anidulafungin and micafungin required between 13 and 26 h to reach the fungicidal endpoint (99.9% killing) against C. glabrata and...
متن کاملCharacterizing the effects of caspofungin on Candida albicans, Candida parapsilosis, and Candida glabrata isolates by simultaneous time-kill and postantifungal-effect experiments.
We measured time-kills and postantifungal effects (PAFEs) of caspofungin against Candida albicans, C. parapsilosis, and C. glabrata isolates. One-hour exposure to caspofungin during PAFE experiments accounted for the majority of killing during time-kill experiments. Regrowth of all isolates was inhibited for at least 24 h following drug washout.
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Candida species are a part of the human microbiome and can cause systemic infection upon immune suppression. Candida glabrata infections are increasing and have greater rates of antifungal resistance than other species. Here, we present a C. glabrata gastrointestinal (GI) colonization model to explore whether colonized yeast exposed to caspofungin, an echinocandin antifungal, develop characteri...
متن کاملA Candida albicans strain with high MIC for caspofungin and no FKS1 mutations exhibits a high chitin content and mutations in two chitinase genes.
We studied the cell wall of a Candida albicans laboratory mutant exhibiting a high minimum inhibitory concentration (MIC; 8 μg ml(-1)) for caspofungin without bearing FKS1 mutations. This strain showed a reduced level of ß 1,3 D glucan (0.43×) and a higher chitin content (2.3×) than a control strain even when grown without caspofungin. No significant over- or under-expression of chitin synthase...
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عنوان ژورنال:
- Antimicrobial agents and chemotherapy
دوره 52 3 شماره
صفحات -
تاریخ انتشار 2008