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Related Experiment Videos

p53 mediates cellular dysfunction and behavioral abnormalities in Huntington's disease.

Byoung-Il Bae1, Hong Xu, Shuichi Igarashi

  • 1Department of Neuroscience, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.

Neuron
|July 6, 2005
PubMed
Summary

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The tumor suppressor p53 (a protein) is specifically upregulated by mutant huntingtin in Huntington's disease (HD). Targeting p53 improves cellular function and reduces neurodegeneration in HD models.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Huntington's disease (HD) is a neurodegenerative disorder characterized by cellular dysfunction and behavioral abnormalities.
  • The role of the p53 protein in the specific pathologies of HD remains incompletely understood.

Purpose of the Study:

  • To investigate the specific role of p53 in mitochondria-associated cellular dysfunction and behavioral abnormalities in Huntington's disease.
  • To determine if mutant huntingtin (mHtt) influences p53 levels and activity.

Main Methods:

  • Neuronal cultures treated with mHtt were analyzed for p53 levels and transcriptional activity.
  • p53 perturbation using pifithrin-alpha, RNA interference, and genetic deletion was performed in HD cellular and animal models.
  • Mitochondrial function, cytotoxicity, and neurobehavioral phenotypes were assessed in mHtt transgenic mice and flies.

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Main Results:

  • Mutant huntingtin specifically binds to and upregulates nuclear p53 levels and transcriptional activity in neuronal cultures.
  • Increased p53 levels were observed in the brains of mHtt transgenic mice and HD patients.
  • Perturbing p53 function ameliorated mitochondrial dysfunction, reduced cytotoxicity in HD cells, and improved respiratory complex IV activity in mHtt transgenic mice.
  • Genetic deletion of p53 suppressed neurodegeneration in flies and neurobehavioral abnormalities in mice.

Conclusions:

  • p53 plays a specific and critical role in the mitochondria-associated cellular dysfunction and behavioral deficits observed in Huntington's disease.
  • p53 acts as a molecular link between nuclear and mitochondrial pathologies in HD.
  • Targeting p53 presents a potential therapeutic strategy for Huntington's disease.