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Summary

Alpha-synuclein accumulation impairs synaptic vesicle cycling in human neurons, contributing to dementia in Parkinson disease and Dementia with Lewy bodies.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Neurodegenerative Diseases

Background:

  • Alpha-synuclein (αS) aggregates in Lewy bodies are linked to dementia in Parkinson disease (PD) and Dementia with Lewy bodies (DLB).
  • The direct impact of αS on synaptic vesicle dynamics in human cortical neurons remains largely unexplored.

Purpose of the Study:

  • To investigate the effect of increased alpha-synuclein levels on synaptic vesicle cycling in human cortical neurons.
  • To establish and utilize a novel induced pluripotent stem cell (iPSC)-based assay for measuring synaptic vesicle dynamics.

Main Methods:

  • Developed and employed an iPSC-based assay platform to measure synaptic vesicle cycling.
  • Utilized human cortical glutamatergic neurons with either transgenic αS expression or endogenous locus triplication.

Main Results:

  • Increased αS levels significantly reduced synaptic vesicle cycling in human cortical neurons.
  • This reduction in cycling occurred under both stimulated and spontaneous conditions.
  • Demonstrated αS-induced synaptic dysfunction in human cortical neurons.

Conclusions:

  • Alpha-synuclein directly impairs synaptic vesicle cycling in human cortical neurons.
  • This finding provides a cellular mechanism linking αS pathology to dementia in PD and DLB.
  • The developed iPSC-based assay is a robust tool for studying synaptic dysfunction.