Therapies against murine Candida guilliermondii infection, relationship between in vitro antifungal pharmacodynamics and outcome

Katihuska Paredes, Francisco Javier Pastor, Javier Capilla, Deanna A. Sutton, Emilio Mayayo, Annette W. Fothergill, Josep Guarro

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Background: Candida guilliermondii has been recognized as an emerging pathogen showing a decreased susceptibility to fluconazole and considerably high echinocandin MICs. Aims: Evaluate the in vitro activity of anidulafungin in comparison to amphotericin B and fluconazole against different isolates of C. guilliermondii, and their efficacy in an immunosuppressed murine model of disseminated infection. Methods: The in vitro susceptibility of four strains against amphotericin B, fluconazole and anidulafungin was performed by using a reference broth microdilution method and time-kill curves. The in vivo efficacy was evaluated by determination of fungal load reduction in kidneys of infected animals receiving deoxycholate AMB at 0,8. mg/kg i.v., liposomal amphotericin B at 10. mg/kg i.v., fluconazole at 50. mg/kg, or anidulafungin at 10. mg/kg. Results: Amphotericin B and anidulafungin showed fungicidal activity, while fluconazole was fungistatic for all the strains. In the murine model, liposomal amphotericin B at 10. mg/kg/day was effective in reducing the tissue burden in kidneys of mice infected with any of the tested strains. However, amphotericin B, anidulafungin and fluconazole were only effective against those strains showing low MIC values. Conclusions: Liposomal amphotericin B showed the higher activity and efficacy against the two strains of C. guilliermondii, in contrast to the poor effect of fluconazole and anidulafungin. Further studies with more isolates of C. guilliermondii representing a wider range of MICs should be carried out to assess whether there is any relationship between MIC values and anidulafungin efficacy.

Original languageEnglish (US)
Pages (from-to)34-39
Number of pages6
JournalRevista Iberoamericana de Micologia
Volume32
Issue number1
DOIs
Publication statusPublished - Jan 1 2015

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Keywords

  • Animal model
  • Candida guilliermondii
  • Fungal infection

ASJC Scopus subject areas

  • Microbiology
  • Infectious Diseases

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