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Related Experiment Video

Updated: Jun 12, 2026

Generation of Alpha-Synuclein Preformed Fibrils from Monomers and Use In Vivo
09:44

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Published on: June 2, 2019

A pathologic cascade leading to synaptic dysfunction in alpha-synuclein-induced neurodegeneration.

David A Scott1, Iustin Tabarean, Yong Tang

  • 1Department of Neurosciences, University of California, San Diego, La Jolla, California 92093, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 18, 2010
PubMed
Summary

Pathologic alpha-synuclein causes synaptic dysfunction by depleting essential presynaptic proteins. This study reveals a novel cascade leading to neurodegeneration and potential therapeutic targets.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Neurodegenerative diseases feature alpha-synuclein deposits, synaptic dysfunction, and dementia.
  • The exact sequence of events leading from alpha-synuclein accumulation to synaptotoxicity remains unclear.

Purpose of the Study:

  • To elucidate the cascade of alpha-synuclein-induced pathologic events.
  • To investigate the link between alpha-synuclein and synaptic protein loss.

Main Methods:

  • Developed a quantitative model using cultured neurons from transgenic mice overexpressing fluorescent-human-alpha-synuclein.
  • Analyzed pathological alterations in alpha-synuclein and presynaptic protein levels over time.
  • Examined synaptic structure and function, including neurotransmitter release and vesicle morphology.

Main Results:

  • Overexpressing neurons exhibited neurotransmitter release deficits and enlarged synaptic vesicles.
  • Several critical presynaptic proteins were undetectable in "vacant synapses" and diminished in others.
  • Similar synaptic protein alterations were observed in human pathologic brains.

Conclusions:

  • Pathologic alpha-synuclein triggers a cascade leading to the loss of critical presynaptic proteins.
  • This loss of presynaptic proteins induces functional synaptic deficits and contributes to neurodegeneration.
  • Findings suggest potential therapeutic targets for alpha-synucleinopathies.