Effective combinatorial antifungal therapy using a host defense peptide mimic that self-assembles into delivery...

Area of Science:

• Biomaterials Science
• Antimicrobial Drug Delivery
• Mycology

Background:

• Systemic fungal infections remain a significant health threat with high mortality rates.
• Challenges in treating fungal infections include the distinct in vivo distribution of combined antifungal drugs.
• Developing strategies for consistent drug delivery is crucial for effective antifungal therapy.

Purpose of the Study:

• To design a polymer-based micelle system for co-delivering antifungal agents.
• To achieve temporal and spatial consistency in drug delivery for synergistic antifungal effects.
• To reduce the toxicity and improve the therapeutic window of amphotericin B (AmB).

Main Methods:

• Synthesis of an antifungal polymer mimicking host defense peptides.
• Encapsulation of amphotericin B (AmB) into polymer micelles (AmBmicelles).
• In vitro and in vivo evaluation of AmBmicelles in mouse models of candidiasis and cryptococcal meningitis.

Main Results:

• The developed polymer micelles demonstrated synergistic effects with AmB.
• AmBmicelles exhibited reduced toxicity and an expanded therapeutic window due to slow drug release.
• Selective targeting of fungal pathogens via charge interactions with fungal membranes was observed.
• Significant increases in survival rates (67-100%) were achieved in mouse models compared to existing treatments.

Conclusions:

• The novel AmB-encapsulated micelle system offers a promising strategy for combating systemic fungal infections.
• This approach enhances the efficacy and safety of antifungal therapy, potentially addressing drug-resistant fungal pathogens.
• The findings suggest broad applicability for this delivery system against various fungal diseases, including meningitis.