Targeting Extracellular Vesicles to Dendritic Cells and Macrophages.

Area of Science:

• Biotechnology
• Immunology
• Nanomedicine

Background:

• Targeting protein therapeutics to specific cells remains a significant challenge in medicine.
• Extracellular vesicles (EVs) are promising drug delivery vehicles due to their biocompatibility, stability, and ability to cross biological barriers.
• Vesicular stomatitis virus protein G (VSV-G) can enhance EV production.

Purpose of the Study:

• To develop an EV-based system for targeted protein delivery to antigen-presenting cells (APCs).
• To enhance the specificity of EV cargo delivery using engineered VSV-G.

Main Methods:

• Engineered EVs by fusing a truncated VSV-G protein with a llama nanobody targeting CD206.
• Assessed the targeting efficiency of these engineered EVs to APCs.

Main Results:

• Attachment of the llama nanobody α-CD206 to truncated VSV-G significantly increased the selectivity of EV cargo delivery to APCs.
• The engineered EVs demonstrated preferential accumulation in APCs.

Conclusions:

• The developed EV system shows high potential for targeted delivery of protein therapeutics to APCs.
• This technology could be applied to treat autoimmune, viral, and oncological diseases by modulating immune responses.