Vancomycin-decorated microbubbles as a theranostic agent for Staphylococcus aureus biofilms

Area of Science:

• Microbiology
• Biomedical Engineering
• Nanotechnology

Background:

• Bacterial biofilms present a significant global healthcare challenge due to persistent and difficult-to-treat infections.
• Current diagnostic and treatment methods for biofilm infections lack specificity, leading to poor outcomes.
• There is a need for novel theranostic approaches for effective biofilm infection management.

Purpose of the Study:

• To investigate the theranostic potential of vancomycin-decorated microbubbles (vMB) for Staphylococcus aureus (S. aureus) biofilm infections.
• To assess the diagnostic capability of vMB for specific bacterial detection in biofilms.
• To evaluate the therapeutic efficacy of vMB combined with ultrasound for biofilm disruption.

Main Methods:

• Vancomycin was chemically coupled to microbubbles and validated using mass spectrometry and 4Pi confocal microscopy.
• The binding specificity of vMB to S. aureus biofilms under varying shear stress conditions was tested.
• Biofilm disruption was assessed upon ultrasound exposure using time-lapse confocal microscopy and ultra-high-speed imaging.

Main Results:

• Vancomycin was successfully incorporated into the microbubble lipid shell.
• vMB demonstrated significantly higher binding to S. aureus biofilms compared to control microbubbles, even under high shear stress and in the presence of free vancomycin.
• Ultrasound exposure in combination with vMB resulted in up to a 28% reduction in biofilm area.

Conclusions:

• Vancomycin-decorated microbubbles (vMB) were successfully produced and demonstrated specific binding to S. aureus biofilms.
• vMB exhibit theranostic potential, enabling specific bacterial detection and targeted biofilm disruption via ultrasound.
• These findings support the development of vMB as a novel tool for managing S. aureus biofilm infections.