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LRRK2 regulates mitochondrial dynamics and function through direct interaction with DLP1.

Xinglong Wang1, Michael H Yan, Hisashi Fujioka

  • 1Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA. xinglong.wang@case.edu

Human Molecular Genetics
|January 10, 2012
PubMed
Summary
This summary is machine-generated.

Leucine-rich repeat kinase 2 (LRRK2) mutations cause Parkinson disease by disrupting mitochondrial dynamics. LRRK2 interacts with DLP1, increasing mitochondrial fragmentation and dysfunction, a process dependent on LRRK2 kinase activity.

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Published on: December 14, 2017

Area of Science:

  • Neuroscience
  • Cell Biology
  • Genetics

Background:

  • Leucine-rich repeat kinase 2 (LRRK2) mutations are a primary genetic cause of Parkinson disease (PD).
  • Mitochondrial dysfunction is a key factor in PD pathogenesis.

Purpose of the Study:

  • To investigate the role of LRRK2 in regulating mitochondrial dynamics and its impact on neuronal health.
  • To elucidate the mechanism by which LRRK2 mutations contribute to PD pathology.

Main Methods:

  • Utilized SH-SY5Y cells and primary cortical neurons expressing wild-type (WT) and mutant LRRK2.
  • Assessed mitochondrial morphology, LRRK2-DLP1 interaction, and DLP1 levels.
  • Employed dominant-negative DLP1 K38A and WT Mfn2 for rescue experiments.

Main Results:

  • WT LRRK2 expression induced mitochondrial fragmentation and increased levels of the fission protein DLP1.
  • PD-associated LRRK2 mutants (R1441C, G2019S) exacerbated mitochondrial fragmentation and dysfunction.
  • LRRK2 directly interacts with DLP1, with enhanced interaction by PD mutants, leading to elevated mitochondrial DLP1.
  • Blocking DLP1 or Mfn2 function ameliorated LRRK2-induced mitochondrial fragmentation and toxicity.
  • GTP-binding deficient and kinase-dead LRRK2 mutants did not induce fragmentation, indicating LRRK2 kinase activity is crucial.

Conclusions:

  • LRRK2 regulates mitochondrial dynamics by increasing mitochondrial DLP1 levels through direct interaction.
  • LRRK2 kinase activity is essential for mediating LRRK2-induced mitochondrial fragmentation and dysfunction in Parkinson disease pathogenesis.