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Palmitoylethanolamide Modulation of Microglia Activation: Characterization of Mechanisms of Action and Implication

Alessia D'Aloia1, Laura Molteni2, Francesca Gullo1

  • 1Department of Biotechnology and Biosciences, University of Milano-Bicocca, 20126 Milano, Italy.

International Journal of Molecular Sciences
|April 3, 2021
PubMed

Insights

Palmitoylethanolamide (PEA) reduces neuroinflammation by shifting microglia from a pro-inflammatory M1 state to an anti-inflammatory M2 phenotype. This lipid compound also prevents neuronal hyperexcitability, offering neuroprotection.

Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Microglia are key regulators of neuroinflammation and neuronal damage.
  • Palmitoylethanolamide (PEA) is an endogenous lipid with known neuroprotective properties.
  • Understanding PEA's mechanism in modulating microglial responses is crucial for neuroinflammation research.

Purpose of the Study:

  • To investigate if Palmitoylethanolamide (PEA) modulates microglia reactive phenotypes to exert neuroprotective and anti-inflammatory effects.
  • To determine the impact of PEA on microglial polarization towards M1 (pro-inflammatory) and M2 (anti-inflammatory) states.
  • To explore the functional consequences of PEA-induced microglial modulation on neuronal activity.

Main Methods:

  • N9 microglial cells and primary microglia cultures were treated with PEA and lipopolysaccharide (LPS).
  • Flow cytometry and morphological analysis assessed microglial phenotypes (M1/M2 markers).
  • Multi-electrode array (MEA) recordings measured neuronal excitability in primary cortical cultures.

Main Results:

  • PEA inhibited LPS-induced M1 pro-inflammatory markers and increased M2 anti-inflammatory markers in microglial cells.
  • Morphological analysis suggested PEA promotes an M2a microglial phenotype.
  • PEA prevented calcium transients and antagonized LPS-induced neuronal hyperexcitability.
  • PEA's effects were independent of Toll-like receptor 4 (TLR4) but partially involved cannabinoid type 2 receptor (CB2R).

Conclusions:

  • Palmitoylethanolamide (PEA) effectively modulates microglial phenotype towards an anti-inflammatory profile.
  • PEA demonstrates neuroprotective effects by reducing neuroinflammation and neuronal hyperexcitability.
  • The findings suggest PEA, potentially via CB2R, is a promising therapeutic agent for neuroinflammatory conditions.
Keywords:
LPScannabinoid receptorcytokineselectrophysiologymicrogliamorphotypesneuroinflammationpalmitoylethanolamide

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