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Comparative Profiling of Mouse and Human Microglial Small Extracellular Vesicles Reveals Conserved Core Functions

Amir-Hossein Bayat1, Damien D Pearse1,2,3,4, Praveen Kumar Singh1

  • 1The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL 33136, USA.

Cells
|January 28, 2026
PubMed

Insights

Microglia-derived small extracellular vesicles (MGEVs) show conserved protective functions across species. However, their miRNA cargo differs, impacting therapeutic potential and highlighting the need for species-specific considerations in neuroimmune research.

Area of Science:

  • Neuroscience
  • Immunology
  • Extracellular Vesicles Biology

Background:

  • Microglia-derived small extracellular vesicles (MGEVs) are crucial for neuroimmune communication.
  • Cross-species comparability and translational relevance of MGEVs are not well-defined.

Purpose of the Study:

  • To establish a framework for comparing mouse and human MGEVs.
  • To assess MGEV bioactivity on human Schwann cells (HuSCs).
  • To identify conserved and species-specific features of MGEVs for therapeutic innovation.

Main Methods:

  • Isolation of MGEVs from immortalized mouse (BV2) and human (HMC3) cell lines using size-exclusion chromatography (SEC).
  • Characterization via nanoparticle tracking analysis (NTA), transmission electron microscopy (TEM), and immunoblotting.
  • Assessment of MGEV effects on HuSC migration, proliferation, and oxidative stress resistance.
  • miRNA sequencing of MGEVs.

Main Results:

  • Human and mouse MGEVs displayed similar morphology but distinct tetraspanin profiles.
  • Both MGEVs reduced HuSC migration and increased proliferation and oxidative stress resistance, with human MGEVs showing stronger effects.
  • 196 shared miRNAs were identified, with human MGEVs enriched in regenerative/metabolic pathways and mouse MGEVs in inflammatory pathways.

Conclusions:

  • MGEVs share core functional properties across species but possess distinct miRNA cargo.
  • Human MGEV signatures are more relevant for therapeutic innovation in neurodegenerative diseases.
  • This study provides a cross-species blueprint for MGEVs, informing translational research and therapeutic development.
Keywords:
BV2HMC3human Schwann cellsmiRNAmicroglianeuroprotectionsEVssmall extracellular vesicles

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