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Related Experiment Video

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Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation
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Alpha-synuclein activates BV2 microglia dependent on its aggregation state.

Alana Hoffmann1, Benjamin Ettle1, Ariane Bruno1

  • 1Department of Molecular Neurology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Biochemical and Biophysical Research Communications
|September 27, 2016
PubMed
Summary

Fibrillar alpha-synuclein, not monomeric or oligomeric forms, significantly activates microglia and promotes cytokine release in synucleinopathies like Parkinson's disease. This highlights a specific interaction crucial for neuroinflammation.

Keywords:
Alpha-synucleinFibrilsInflammationMicrogliaSynucleinopathies

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Synucleinopathies (Parkinson's disease, DLB, MSA) involve alpha-synuclein aggregates and neuroinflammation characterized by microglial activation.
  • Alpha-synuclein's direct role in activating microglia and its specific species responsible for this activation remain unclear.

Purpose of the Study:

  • To investigate how different aggregation states of alpha-synuclein influence microglial activation and cytokine production.
  • To determine if specific alpha-synuclein species are preferentially recognized and internalized by microglia.

Main Methods:

  • Utilized microglial BV2 cell cultures stimulated with varying forms of human alpha-synuclein (monomeric, oligomeric, fibrillar).
  • Measured pro-inflammatory cytokine production (TNF-α, IL-1β) and phagocytosis rates.
  • Assessed time- and concentration-dependency of microglial responses to alpha-synuclein fibrils.

Main Results:

  • Primarily fibrillar alpha-synuclein significantly increased pro-inflammatory cytokine production and secretion by BV2 cells compared to monomeric and oligomeric forms.
  • BV2 cells demonstrated preferential phagocytosis of fibrillar alpha-synuclein over other aggregation states.
  • Microglial uptake and activation by alpha-synuclein fibrils were dependent on both time and concentration, with fibril degree influencing internalization efficiency.

Conclusions:

  • The aggregation state of alpha-synuclein critically determines its interaction with microglia.
  • Fibrillar alpha-synuclein is a key species driving microglial activation and subsequent neuroinflammation in synucleinopathies.
  • This study elucidates a specific crosstalk mechanism between distinct alpha-synuclein species and microglial cells, impacting disease pathogenesis.