Modulation of amphotericin B activity by association with mannose ester

Area of Science:

• Biochemistry
• Pharmacology
• Immunology

Background:

• Amphotericin B (AmB) is a potent antifungal agent with significant toxicity.
• Developing safer and more effective AmB formulations is crucial for treating invasive fungal infections.

Purpose of the Study:

• To investigate the biological and molecular properties of a novel Amphotericin B formulation complexed with palmitoyl mannose.
• To assess the impact of palmitoyl mannose on AmB's toxicity, efficacy, and inflammatory potential.

Main Methods:

• In vitro and in vivo studies were conducted.
• Evaluated cytotoxicity against mammalian cells and fungi.
• Assessed effects on macrophage activity, inflammatory properties, and acute toxicity in mice.
• Analyzed spectral behavior in the presence of serum or propanol.

Main Results:

• The AmB-palmitoyl mannose complex showed decreased cytotoxicity to both fungal and mammalian cells.
• Fungistatic potential of AmB was increased in the complex.
• Inflammatory properties were conserved, and acute toxicity in mice was significantly diminished.
• Complex formation likely impedes AmB interaction with serum or cell membranes.

Conclusions:

• The new AmB formulation demonstrates a potentially improved therapeutic profile with reduced toxicity.
• The complex may enhance immunoadjuvant properties and localize inflammation, leading to better treatment outcomes.
• This formulation offers a promising strategy for safer and more effective antifungal therapy.