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Mitochondrial redox signalling by p66Shc mediates ALS-like disease through Rac1 inactivation

Maria Grazia Pesaresi1, Ilaria Amori, Carlotta Giorgi

  • 1Laboratory of Neurochemistry, Fondazione S. Lucia IRCCS, Rome, Italy.

Human Molecular Genetics
|August 11, 2011
PubMed

Insights

Mutant SOD1 in familial ALS triggers oxidative stress and mitochondrial damage. Inhibiting p66Shc, a key regulator, protects neurons and improves outcomes in ALS mouse models.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Genetics

Background:

  • Familial amyotrophic lateral sclerosis (ALS) involves motoneuron death.
  • Mutant SOD1 (mutSOD1) is a key factor in ALS pathogenesis.
  • Oxidative stress and mitochondrial damage are implicated in motoneuron degeneration.

Purpose of the Study:

  • To investigate the role of p66Shc in mutSOD1-induced neuronal death.
  • To explore p66Shc as a potential therapeutic target for ALS.

Main Methods:

  • Neuronal cell cultures expressing mutSOD1.
  • Overexpression of inactive p66Shc mutants.
  • Deletion of p66Shc in transgenic ALS mouse models.
  • Mitochondrial function assays.
  • Assessment of motor performance and survival rates.
  • Analysis of GTPase Rac1 activity.

Main Results:

  • mutSOD1 expression activates p66Shc in neuronal cells.
  • Inactive p66Shc mutants protect cells from mutSOD1-induced mitochondrial damage.
  • p66Shc deletion in mice improves mitochondrial function, delays disease onset, enhances motor performance, and prolongs survival.
  • Activated p66Shc by mutSOD1 reduces Rac1 activity via redox-sensitive regulation.

Conclusions:

  • p66Shc plays a critical role in mutSOD1-mediated mitochondrial dysfunction and motoneuron death in ALS.
  • Targeting p66Shc activation may offer a novel therapeutic strategy for familial ALS.

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