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Related Experiment Video

Updated: Jul 27, 2025

Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment

Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment

Published on: June 2, 2020

Mesenchymal-Derived Extracellular Vesicles Enhance Microglia-mediated Synapse Remodeling after Cortical Injury in

Yuxin Zhou¹, Hrishti Bhatt¹, Chromewell A Mojica¹

¹Boston University Chobanian & Avedisian School of Medicine.

Research Square

|June 9, 2023

Summary

Mesenchymal-derived extracellular vesicles (MSC-EVs) promote recovery after primate brain injury by enhancing microglial interactions and synaptic plasticity. EV treatment aids debris clearance and prevents chronic inflammation, preserving motor networks for functional recovery.

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Area of Science:

Neuroscience
Immunology
Regenerative Medicine

Background:

Microglial neuro-immune interactions are crucial for primate brain injury recovery, particularly after stroke.
Mesenchymal-derived extracellular vesicles (MSC-EVs) previously enhanced motor recovery in aged rhesus monkeys post-M1 injury.
Understanding microglia-synapse interactions is key to elucidating MSC-EVs' therapeutic mechanisms.

Approach:

Investigated structural and molecular interactions between microglia and neuronal synapses post-cortical injury.
Utilized multi-labeling immunohistochemistry, high-resolution microscopy, and gene expression analysis.
Quantified synaptic markers, microglia markers (Iba-1, P2RY12), and C1q in perilesional M1 and premotor cortices (PMC) of vehicle- or EV-treated monkeys.

Key Points:

EV treatment ameliorated lesion-related loss of excitatory synapses.
EVs showed region-dependent effects on microglia and C1q expression.
In M1, EVs increased C1q+ hypertrophic microglia, aiding debris clearance.
In PMC, EVs decreased C1q+ synaptic tagging and microglial-spine contacts.

Conclusions:

EV treatment facilitates synaptic plasticity by enhancing acute damage clearance in M1.
EVs prevent chronic inflammation and excessive synaptic loss in PMC, preserving motor networks.
MSC-EVs support functional recovery by maintaining balanced cortical synaptic connectivity.