Assessing In Vivo Bacterial Extracellular Vesicle (BEV) Biodistribution Using Fluorescent Lipophilic Membrane Stains

Area of Science:

• Microbiology
• Nanotechnology
• Biotechnology

Background:

• Bacterial extracellular vesicles (BEVs) are nanoparticles involved in microbe-host interactions.
• BEVs can traverse host barriers like the blood-brain-barrier (BBB) and accumulate in various organs.
• Current methods for tracking BEVs in vivo have limitations.

Purpose of the Study:

• To develop a general, user-friendly method for labeling BEVs.
• To overcome limitations of existing BEV tracking techniques.
• To enable quantitative assessment of BEV organ trafficking.

Main Methods:

• Labeling bacterial extracellular vesicles (BEVs) using lipophilic fluorescent membrane stains.
• Implementing quantitative ex vivo tissue imaging for BEV biodistribution analysis.
• Validating the method for ease of adoption by non-expert users.

Main Results:

• A straightforward protocol for fluorescently labeling BEVs was established.
• The method allows for improved interpretation of in vivo bioimaging patterns.
• Quantitative ex vivo imaging provides robust data on BEV organ trafficking.

Conclusions:

• This labeling strategy offers a practical approach for studying BEV biodistribution.
• The method enhances the utility of BEVs in research and potential therapeutic applications.
• Accurate tracking of BEVs is crucial for understanding their biological roles.