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Azole drugs have differential efficacy in varied models of immunosuppression in larval zebrafish hosts

Kevin E Ayala1, Sarah Baum2,3, Savini U Thrikawala1,2

  • 1Department of Biological Sciences, Clemson University, Clemson, SC, USA.

Future Microbiology
|August 4, 2025
PubMed
Abstract

Insights

Voriconazole and posaconazole effectively treat fungal infections across varied immunosuppression models. However, isavuconazole and itraconazole show host-specific effectiveness, highlighting the need for tailored antifungal drug selection.

Area of Science:

  • Mycology
  • Immunology
  • Pharmacology

Background:

  • Fungal infections pose a significant mortality risk, especially in immunocompromised individuals.
  • Current antifungal treatments have limitations and variable efficacy.
  • Understanding drug efficacy across different immunosuppression types is crucial.

Purpose of the Study:

  • To evaluate the efficacy of four triazole antifungal drugs against Aspergillus fumigatus.
  • To compare drug performance in various immunosuppressed and immunodeficient host models.
  • To investigate host-specific drug efficacy and toxicity.

Main Methods:

  • Utilized a larval zebrafish model for Aspergillus fumigatus infection.
  • Tested four triazole drugs: voriconazole, posaconazole, isavuconazole, and itraconazole.
  • Employed five distinct immunosuppressed/immunodeficient conditions, including drug-treated and genetically modified larvae.

Main Results:

  • Voriconazole and posaconazole demonstrated high efficacy across all tested host backgrounds.
  • Isavuconazole and itraconazole exhibited variable efficacy and toxicity depending on the host.
  • Posaconazole prevented fungal spore germination but did not inhibit hyphal growth post-germination.

Conclusions:

  • The larval zebrafish model is effective for antifungal drug screening in diverse host backgrounds.
  • Drug efficacy and impact on fungal growth within the host can be determined using this model.
  • Findings underscore the importance of considering host immune status when selecting antifungal therapies.
Keywords:
Aspergillusdexamethasoneindomethacinlarval zebrafishmacrophagesneutrophilstriazoles

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