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Neuron-released oligomeric α-synuclein is an endogenous agonist of TLR2 for paracrine activation of microglia

Changyoun Kim1, Dong-Hwan Ho, Ji-Eun Suk

  • 1Department of Biomedical Science and Technology, Konkuk University, Seoul 143-701, Republic of Korea.

Nature Communications
|March 7, 2013
PubMed

Insights

Extracellular alpha-synuclein (α-synuclein) activates microglia via Toll-like receptor 2 (TLR2), driving Parkinson's disease neuroinflammation. This suggests α-synuclein oligomers and TLR2 are potential therapeutic targets.

Area of Science:

  • Neuroscience
  • Immunology
  • Biochemistry

Background:

  • Parkinson's disease (PD) involves α-synuclein aggregation and microglial activation.
  • The link between protein aggregation and neuroinflammation in PD is not fully understood.

Purpose of the Study:

  • To investigate the relationship between α-synuclein and microglia-mediated neuroinflammation in PD.
  • To identify the mechanism by which α-synuclein influences microglial activation.

Main Methods:

  • In silico, in vitro, and in vivo experimental approaches.
  • Analysis of α-synuclein's interaction with Toll-like receptor 2 (TLR2) on microglia.

Main Results:

  • Extracellular α-synuclein acts as an endogenous agonist for TLR2.
  • Specific oligomeric forms of α-synuclein activate TLR2 and trigger microglial inflammatory responses.
  • This interaction is conformation-dependent.

Conclusions:

  • Extracellular α-synuclein binding to TLR2 on microglia mediates neuroinflammation in PD.
  • Both α-synuclein and TLR2 represent potential therapeutic targets for neurological diseases characterized by neuroinflammation.

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