Comprehensive Molecular Profiles of Functionally Effective MSC-Derived Extracellular Vesicles in Immunomodulation

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Mesenchymal stem/stromal cell-derived extracellular vesicles (MSC-EVs) possess immunomodulatory properties.
• The precise molecular mechanisms of EV-mediated immunomodulation remain incompletely understood.

Purpose of the Study:

• To elucidate the molecular mechanisms behind MSC-EV immunomodulation.
• To identify key molecular factors within MSC-EVs responsible for their therapeutic effects in autoimmune conditions.

Main Methods:

• Comparative analysis of MSC-EVs from early-passage versus late-passage MSCs.
• Evaluation of MSC-EVs produced via 2D versus 3D cell culture.
• Proteomic and microRNA sequencing for molecular profiling.
• Functional assays using T cell receptor (TCR) or Toll-like receptor 4 (TLR4)-stimulated splenocytes and a murine ocular Sjögren's syndrome model.

Main Results:

• Early-passage MSC-EVs demonstrated superior immunomodulatory potency compared to late-passage MSC-EVs.
• MSC-EVs derived from 3D culture were more effective than those from 2D culture.
• Proteomic and miRNA profiling identified transforming growth factor β1 (TGF-β1), pentraxin 3 (PTX3), let-7b-5p, and miR-21-5p as enriched factors.
• Manipulation of these factors in MSCs significantly altered the immunosuppressive capacity of their EVs.
• A strong correlation was observed between the levels of TGF-β1, PTX3, let-7b-5p, or miR-21-5p in MSC-EVs and their suppressive function.

Conclusions:

• TGF-β1, PTX3, let-7b-5p, and miR-21-5p are identified as key mediators of MSC-EV therapeutic effects in autoimmune diseases.
• These findings enhance understanding of EV-mediated immunomodulation.
• The identified molecules serve as potential functional biomarkers for developing effective EV-based therapies.