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Updated: Jan 10, 2026

Isolation, Characterization, and Therapeutic Application of Extracellular Vesicles from Cultured Human Mesenchymal Stem Cells
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Hacking Extracellular Vesicles: Using Vesicle-Related Tags to Engineer Mesenchymal Stromal Cell-Derived Extracellular

Gabriele Scattini1, Giulia Pianigiani2, Stefano Capomaccio1

  • 1Department of Veterinary Medicine, University of Perugia, 06126 Perugia, Italy.

Pharmaceutics
|November 27, 2025
PubMed
Summary

Researchers engineered canine Mesenchymal Stromal Cell-Extracellular Vesicles (MSC-EVs) to deliver a reporter protein. CD63 proved the most effective tag for enhancing protein loading into these promising diagnostic and therapeutic nanocarriers.

Keywords:
CD63EVs engineeringGFPMesenchymal Stromal CellsPalmitoylationSynteninTSG101extracellular vesiclestransfection

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Cell Biology

Background:

  • Extracellular Vesicles (EVs) show potential as diagnostic tools and nanocarriers for drug delivery.
  • Mesenchymal Stromal Cell-derived EVs (MSC-EVs) are particularly promising for targeted biotherapeutic delivery.
  • Engineering EVs for enhanced functionality is crucial for their clinical application.

Purpose of the Study:

  • To identify the most effective endogenous loading mechanism for a reporter protein into canine MSC-EVs.
  • To compare the efficiency of different protein tags (CD63, Syntenin-1, TSG101, Lck palmitoylation signal) for EV cargo loading.
  • To optimize canine MSC-EVs for enhanced therapeutic and diagnostic applications.

Main Methods:

  • Canine MSCs were genetically engineered to express Green Fluorescent Protein (GFP) fused to various tags.
  • Western blotting, confocal microscopy, and transmission electron microscopy were used to confirm protein expression and localization.
  • EVs were analyzed for GFP incorporation using the different tags.

Main Results:

  • All tested tags facilitated GFP delivery into canine MSC-EVs.
  • CD63 exhibited the highest expression efficiency, with approximately 5-fold higher GFP-CD63 levels compared to untagged GFP.
  • Syntenin-1 showed high loading efficiency but diffuse cellular localization, while TSG101 had low expression, and the Lck signal showed low efficiency and specificity.

Conclusions:

  • CD63 is the most suitable tag for engineering canine MSC-EVs for enhanced reporter protein loading.
  • While Syntenin-1 has a higher secretion index, CD63's abundance suggests greater post-secretion uptake.
  • Further research into CD63's role in EV trafficking can advance EV bioengineering for therapeutic applications.