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Extracellular Vesicles from Mesenchymal Stromal Cells Modulate Inflammatory Responses on Feline Mixed Glia
Nikolia Darzenta1,2, Emily Davis1,2, Anna Cochran1,2
1Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.
Stem Cells and Development
|July 5, 2025
Summary
Mesenchymal stromal cell-derived extracellular vesicles (MSC-EVs) show varied anti-inflammatory effects based on culture conditions. Inflammatory media-derived EVs most effectively reduced inflammatory markers in feline glial cells.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Mesenchymal stromal cell-derived extracellular vesicles (MSC-EVs) are investigated for treating neuroinflammation due to their immunomodulatory properties and ability to cross the blood-brain barrier.
- Optimizing MSC culture conditions is crucial for maximizing the anti-inflammatory efficacy of secreted EVs for neurological disease therapies.
- Current knowledge gaps exist regarding the specific MSC culture parameters that yield MSC-EVs with superior therapeutic potential.
Purpose of the Study:
- To characterize extracellular vesicles (EVs) derived from mesenchymal stromal cells (MSCs) cultured under distinct conditions.
- To evaluate the *in vitro* anti-inflammatory efficacy of these MSC-EVs in lipopolysaccharide (LPS)-stimulated feline mixed glial cells.
Main Methods:
- Umbilical cord-derived MSCs were cultured in serum-free (SF), inflammatory (IF), or EV-depleted fetal bovine serum (FBS) supplemented media.
- Isolated MSC-EVs were characterized for particle size and yield.
- Anti-inflammatory effects were assessed by measuring cytokine production (IL-6, TNF-α) and gene expression (NF-κB p65, iNOS) in LPS-stimulated feline mixed glia.
Main Results:
- All tested MSC-EV isolates were below 160 nm in size.
- IF-EVs significantly reduced interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) production and downregulated NF-κB p65 transcription.
- SF-EVs and FBS-EVs reduced IL-6 secretion, with SF-EVs also significantly inhibiting p65 expression and iNOS mRNA levels.
Conclusions:
- MSC culture conditions significantly influence the immunomodulatory potential of secreted EVs.
- EVs derived from MSCs cultured in inflammatory media demonstrate potent anti-inflammatory effects in a feline glial cell model.
- These findings highlight the importance of optimizing MSC culture environments for developing effective EV-based therapies for neuroinflammatory conditions.
