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Related Experiment Video

Updated: Sep 11, 2025

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Neural Progenitor Cell- and Developing Neuron-Derived Extracellular Vesicles Differentially Modulate Microglial

Tsung-Lang Chiu1, Hsin-Yi Huang2, Hock-Kean Liew2

  • 1Division of Neurosurgery, Neuro-Medical Scientific Center, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien 970, Taiwan.

International Journal of Molecular Sciences
|August 14, 2025
PubMed
Summary

Neural progenitor cells and developing neurons release extracellular vesicles that activate microglia. This activation, mediated by Toll-like receptor 7, influences microglial development and promotes dopaminergic neuron survival.

Keywords:
MAPKsNF-κBToll-like receptor 7developing neuronsextracellular vesiclesmicroglianeural progenitor cells

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Immunology

Background:

  • Microglia transition from activated to inactivated states during brain development.
  • Mechanisms controlling this microglial developmental transition are poorly understood.
  • Extracellular vesicles (EVs) mediate cell-to-cell communication.

Purpose of the Study:

  • To investigate the role of EVs from neural progenitor cells (NPCs) and developing neurons in microglial activation.
  • To elucidate the signaling pathways involved in EV-mediated microglial modulation.
  • To determine the impact of these interactions on neuronal survival.

Main Methods:

  • Long-term neuron culture systems with NPCs and microglia.
  • EV isolation and characterization.
  • Analysis of cytokine expression (TNF-α, IL-1β, IL-6) and signaling pathways (MAPK, NF-κB) in microglia.
  • Pharmacological inhibition of Toll-like receptor 7 (TLR7).
  • Assessment of dopaminergic neuron survival.

Main Results:

  • EVs from NPCs and immature neurons induced higher microglial inflammatory cytokine expression compared to mature neuron EVs.
  • NPC/immature neuron-derived EVs activated MAPK and NF-κB signaling in microglia.
  • TLR7 mediated the EV-induced activation of NF-κB and MAPK pathways.
  • Microglia conditioned by NPC/immature neuron EVs promoted dopaminergic neuron survival.

Conclusions:

  • NPCs and developing neurons utilize EVs to modulate microglial activation states and functions.
  • TLR7 signaling is a key pathway in EV-mediated microglial responses.
  • This EV-based crosstalk plays a role in supporting developing neuronal populations.