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Alpha-synuclein aggregates trigger cardiolipin externalization and mitophagy.

Rebeca Martín-Jiménez1,2, Olivier Lurette1,2, Etienne Hebert-Chatelain1,2

  • 1Canada Research Chair in Mitochondrial Signaling and Physiopathology, Moncton, NB, Canada.

Autophagy Reports
|May 21, 2025
PubMed
Summary
This summary is machine-generated.

Parkinson disease (PD) involves alpha-synuclein (α-syn) aggregation. New optogenetic tools show α-syn aggregates disrupt mitochondria, causing depolarization and mitophagy, key events in PD.

Keywords:
Lewy bodiesPLSCR3mitochondrial fissionmitochondrial membrane potentialparkinson diseaseselective autophagyubiquitin

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Lewy bodies, primarily alpha-synuclein (α-syn) aggregates, are hallmarks of Parkinson disease (PD).
  • Mitochondrial dysfunction is implicated in PD pathogenesis, but the direct impact of α-syn aggregates on mitochondria is unclear.
  • Technical challenges hinder the study of different α-syn forms and their mitochondrial interactions.

Purpose of the Study:

  • To investigate the dynamic interaction between α-syn aggregates and mitochondria.
  • To elucidate the consequences of α-syn aggregation on mitochondrial function.
  • To utilize a novel optogenetic tool for controlled α-syn aggregation.

Main Methods:

  • Development and application of a light-induced protein aggregation (LIPA) optogenetic tool.
  • Controlled induction of α-syn aggregation in cellular models.
  • Analysis of mitochondrial integrity, membrane potential, and cardiolipin localization.
  • Assessment of mitophagy induction.

Main Results:

  • α-syn aggregates were observed to dynamically interact with mitochondria.
  • Mitochondrial depolarization was triggered by α-syn aggregates.
  • Cardiolipin translocation to the mitochondrial surface was observed.
  • Mitophagy was induced in response to α-syn aggregation and mitochondrial damage.

Conclusions:

  • α-syn aggregation directly impacts mitochondrial function, leading to depolarization and initiating mitophagy.
  • The findings provide new insights into the role of mitochondrial dysfunction in Parkinson disease.
  • Optogenetic control of α-syn aggregation offers a powerful approach to study PD pathogenesis.