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Biofilm Formation in Clinical Isolates of Fusarium
Ray Zhang1,2, Nathan Wiederhold3, Richard Calderone1
1Department of Microbiology & Immunology, Georgetown University Medical Center, Washington, DC 20057, USA.
Abstract:
Many microbial pathogens form biofilms, assemblages of polymeric compounds that play a crucial role in establishing infections. The biofilms of Fusarium species also contribute to high antifungal resistance. Using our collection of 29 clinical Fusarium isolates, we focused on characterizing differences in thermotolerance, anaerobic growth, and biofilm formation across four Fusarium species complexes commonly found in clinical settings. We investigated the role of carbon sources, temperature, and fungal morphology on biofilm development. Using fluorescence microscopy, we followed the stages of biofilm formation. Biofilms were screened for sensitivity/resistance to the antifungals voriconazole (VOR), amphotericin B (AmB), and 5-fluorocytosine (5-FC). Our findings revealed generally poor thermotolerance and growth under anaerobic conditions across all Fusarium species. VOR was more effective than AmB in controlling biofilm formation, but the combination of VOR, AmB, and 5-FC significantly reduced biofilm formation across all species. Additionally, Fusarium biofilm formation varied under non-glucose carbon sources, highlighting the species' adaptability to different nutrient environments. Notably, early stage biofilms were primarily composed of lipids, while polysaccharides became dominant in late-stage biofilms, suggesting a dynamic shift in biofilm composition over time.
Insights
This study reveals that Fusarium species exhibit poor thermotolerance and anaerobic growth, but their biofilms show varied antifungal resistance. A combination of antifungals effectively reduced Fusarium biofilms, highlighting adaptability in clinical settings.
Area of Science:
- Mycology
- Clinical Microbiology
- Infectious Diseases
Background:
- Microbial biofilms are critical for persistent infections and antifungal resistance.
- Fusarium species are increasingly recognized as significant opportunistic pathogens in clinical settings.
- Understanding Fusarium biofilm characteristics is crucial for developing effective treatment strategies.
Purpose of the Study:
- To characterize thermotolerance, anaerobic growth, and biofilm formation in clinical Fusarium isolates.
- To investigate the influence of carbon sources, temperature, and morphology on Fusarium biofilm development.
- To assess the susceptibility of Fusarium biofilms to key antifungal agents.
Main Methods:
- Characterization of 29 clinical Fusarium isolates from four species complexes.
- Assessment of thermotolerance and anaerobic growth.
- Fluorescence microscopy to visualize biofilm stages and composition (lipids, polysaccharides).
- Antifungal susceptibility testing against voriconazole, amphotericin B, and 5-fluorocytosine.
Main Results:
- Fusarium species generally displayed poor thermotolerance and limited anaerobic growth.
- Biofilm formation varied significantly based on carbon source and fungal morphology.
- Voriconazole demonstrated greater efficacy than amphotericin B against biofilms.
- A combination of voriconazole, amphotericin B, and 5-fluorocytosine markedly inhibited biofilm formation.
- Biofilm composition shifted from lipid-rich in early stages to polysaccharide-rich in later stages.
Conclusions:
- Fusarium species possess adaptable biofilm-forming capabilities influenced by environmental factors.
- Combined antifungal therapy offers a promising strategy for combating Fusarium biofilms in clinical settings.
- The dynamic compositional changes in Fusarium biofilms warrant further investigation for targeted therapeutic interventions.
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