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Low stability of Huntington muscle mitochondria against Ca2+ in R6/2 mice

Zemfira Z Gizatullina1, Katrin S Lindenberg, Phoebe Harjes

  • 1KeyNeurotek AG, ZENIT Technology Park, Magdeburg, Germany.

Annals of Neurology
|January 27, 2006
PubMed
Abstract

Insights

Mitochondrial dysfunction in Huntington's disease (HD) involves decreased stability of mitochondria against calcium, contributing to cell atrophy. This study investigated muscle and mitochondria in R6/2 mice, revealing significant impairments.

Area of Science:

  • Biomedical Science
  • Neuroscience
  • Mitochondrial Biology

Background:

  • Huntington's disease (HD) is a neurodegenerative disorder.
  • Mitochondrial dysfunction is implicated in HD pathogenesis.
  • Understanding specific mitochondrial defects is crucial for therapeutic development.

Purpose of the Study:

  • To detect and characterize mitochondrial dysfunction in Huntington's disease (HD).
  • To investigate muscle and muscle mitochondria in a mouse model of HD.
  • To compare mitochondrial function between HD and wild-type mice.

Main Methods:

  • Investigation of muscle and muscle mitochondria from 14- to 16-week-old R6/2 mice (HD model) and wild-type littermates.
  • Assessment of muscle fiber atrophy and aggregate formation.
  • Evaluation of mitochondrial stability using swelling and Ca2+ accumulation experiments.
  • Measurement of Complex I-dependent respiration and sensitivity to calcium inhibition.

Main Results:

  • HD muscle exhibited atrophic fibers and increased fuchsinophilic aggregates.
  • Reduced cytochrome c oxidase activity (15%) was observed in HD muscle.
  • HD mitochondria showed decreased stability against Ca2+-induced permeability transition.
  • Complex I-dependent respiration in HD mitochondria was more sensitive to calcium inhibition.

Conclusions:

  • Decreased stability of HD mitochondria against calcium contributes to energetic depression.
  • Mitochondrial dysfunction plays a significant role in the cell atrophy observed in Huntington's disease.
  • These findings highlight mitochondrial calcium handling as a potential therapeutic target in HD.

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