Rational design of magnetoliposomes for enhanced interaction with bacterial membrane models

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Growing need for novel antibacterial strategies.
• Limitations of current antibiotic treatments.
• Potential of nanotechnology in targeted therapy.

Purpose of the Study:

• To develop and optimize PEGylated magnetoliposomes (MLPs@PEG) for bacterial infection treatment.
• To encapsulate superparamagnetic iron oxide nanoparticles (SPIONs) within fusogenic liposomes.
• To evaluate the targeting efficiency of MLPs@PEG towards bacterial membranes.

Main Methods:

• Box-Behnken design for optimization of liposome size and SPIONs encapsulation.
• Cytocompatibility assays (fibroblast and hemolytic tests).
• Förster resonance energy transfer (FRET) based lipid mixing assays to assess membrane interaction.
• Confocal microscopy and fluorescence lifetime measurements using giant unilamellar vesicles (GUVs).

Main Results:

• Optimized MLPs@PEG achieved a mean size of 182 nm, PDI of 0.19, and 76% SPIONs encapsulation efficiency.
• No observed toxicity in fibroblasts or hemolytic effects at tested concentrations.
• MLPs@PEG demonstrated preferential interaction with bacterial membrane models over eukaryotic models.
• Confocal microscopy and GUVs studies validated the targeted membrane interaction.

Conclusions:

• Developed MLPs@PEG are a safe and efficient nanocarrier system.
• The hybrid nanosystem exhibits enhanced targetability towards bacterial membranes.
• MLPs@PEG hold potential as an advanced drug delivery platform for combating bacterial infections.