Super homotypic targeting by surface engineering of extracellular vesicles

Area of Science:

• Biotechnology
• Cell Biology
• Nanotechnology

Background:

• Homotypic targeting, the preferential interaction between same-type cells, is crucial for tissue formation and immune responses but remains underexploited.
• Extracellular vesicles (EVs) mediate intercellular communication, but their inherent homotypic targeting is limited.

Purpose of the Study:

• To develop a strategy for significantly enhancing homotypic targeting using engineered small extracellular vesicles (sEVs).
• To enable precise discrimination of sEVs from different cellular origins within complex biological samples.

Main Methods:

• Engineering the surface of small extracellular vesicles (sEVs) with lanthanides.
• Quantifying cell-sEV interactions to measure the enhancement of homotypic targeting.

Main Results:

• Lanthanide-engineered sEVs demonstrated a >25-fold amplification of specific cell-sEV interactions.
• Achieved selective capture of engineered sEVs by cognate cells, even amidst excess non-target sEVs, termed 'super homotypic targeting'.
• Demonstrated applications in detecting specific sEVs using cells and detecting specific cells using sEVs, including cancer detection from blood samples.

Conclusions:

• Super homotypic targeting offers a novel method to enhance specificity in cell-vesicle interactions.
• This approach has significant potential for advancing diagnostics, immunotherapy, drug delivery, and regenerative medicine.