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Metabolic Labeling of Leucine Rich Repeat Kinases 1 and 2 with Radioactive Phosphate
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LRRK2 Promotes Tau Accumulation, Aggregation and Release.

Patrícia Silva Guerreiro1,2, Ellen Gerhardt2, Tomás Lopes da Fonseca1,2

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|May 28, 2015
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Summary

Mutations in leucine-rich repeat kinase 2 (LRRK2) promote Tau accumulation and secretion, independent of kinase activity. This LRRK2-mediated proteasome impairment offers a potential therapeutic target for Parkinson

Keywords:
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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Leucine-rich repeat kinase 2 (LRRK2) mutations are a primary cause of familial Parkinson's disease (PD).
  • LRRK2's G2019S mutation enhances kinase function, implicating it in PD pathogenesis.
  • Hyperphosphorylated Tau protein, a hallmark of Alzheimer's, is also found in PD brains.

Purpose of the Study:

  • To investigate the interaction between LRRK2 and Tau protein in Parkinson's disease.
  • To elucidate the role of LRRK2 kinase activity in Tau pathology.
  • To explore the cellular mechanisms underlying LRRK2's effect on Tau.

Main Methods:

  • Demonstrated the physical interaction between LRRK2 and Tau.
  • Assessed the impact of LRRK2 on Tau species and secretion.
  • Investigated the role of LRRK2 kinase activity in Tau regulation.
  • Examined the effect of LRRK2 on proteasomal degradation pathways.

Main Results:

  • LRRK2 interacts with Tau independently of its kinase activity.
  • LRRK2 promotes the accumulation of non-monomeric and high-molecular weight Tau species.
  • LRRK2 increases Tau secretion, linked to impaired proteasomal degradation.
  • LRRK2-mediated proteasome impairment contributes to Tau pathology progression.

Conclusions:

  • LRRK2 regulates intracellular Tau levels through proteasome impairment.
  • The interaction between LRRK2 and Tau, independent of kinase activity, impacts PD pathology.
  • Targeting the interplay between LRRK2 and proteasome activity may offer therapeutic strategies for PD.