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

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Extracellular Vesicles Cargo in Modulating Microglia Functional Responses

Maria Ester La Torre1, Maria Antonietta Panaro2, Melania Ruggiero2

  • 1Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy.

Biology
|October 27, 2022
PubMed

Insights

Extracellular vesicles (EVs) from activated microglia, termed EVs-LPS, can trigger inflammation in other microglia, similar to LPS alone. This highlights EVs

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Extracellular vesicles (EVs) are key mediators of intercellular communication, released by all cell types, including brain cells.
  • Microglia, the central nervous system's immune cells, release EVs under both normal and inflammatory conditions, with differing contents.
  • Microglia play crucial roles in immune surveillance and inflammatory responses within the brain.

Purpose of the Study:

  • To investigate the impact of EVs derived from LPS-stimulated microglia (EVs-LPS) on microglia activation.
  • To determine if EVs-LPS can induce a pro-inflammatory state in resting microglia (BV2 cells).
  • To analyze changes in BV2 cell morphology, proliferation, migration, and pro-inflammatory cytokine release following EVs-LPS stimulation.

Main Methods:

  • Isolation and characterization of EVs from LPS-stimulated microglia.
  • Stimulation of BV2 microglia cells with EVs-LPS.
  • Analysis of BV2 cell morphology, proliferation, and migration.
  • Measurement of pro-inflammatory cytokine expression and release.

Main Results:

  • EVs-LPS effectively activated microglia, inducing a pro-inflammatory state comparable to LPS alone.
  • EVs from control (unstimulated) microglia did not induce pro-inflammatory polarization.
  • EVs-LPS stimulation altered BV2 cell morphology, proliferation, and migration, and increased pro-inflammatory cytokine release.

Conclusions:

  • Extracellular vesicles play a critical role in cell-to-cell communication within the central nervous system.
  • EVs produced during inflammation can exacerbate inflammatory processes by activating microglia.
  • This microglial activation by EVs may have significant implications for the health of all brain cells.
Keywords:
BV2LPSextracellular vesiclesinflammationmicrogliamicroglia polarizationmigration

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