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Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils
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Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils

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Mitochondrial dysfunction and Alzheimer's disease

Xi Chen1, David Stern, Shi Du Yan

  • 1Department of Neurology and Veteran Administration Medical Center, School of Medicine, Saint Louis University, St. Louis, MO 63106, USA.

Current Alzheimer Research
|December 16, 2006
PubMed

Insights

Alzheimer's disease (AD) involves mitochondrial dysfunction and amyloid-beta peptide (Abeta) accumulation. Targeting the Abeta-amyloid binding alcohol dehydrogenase (ABAD) interaction may offer a new therapeutic strategy for AD.

Area of Science:

  • Neuroscience
  • Mitochondrial Biology
  • Alzheimer's Disease Pathogenesis

Background:

  • Mitochondrial dysfunction is linked to metabolic issues in Alzheimer's disease (AD).
  • Amyloid-beta peptide (Abeta) accumulates within mitochondria in AD, causing stress and impaired function.
  • Somatic mitochondrial DNA deletions may contribute to AD development.

Purpose of the Study:

  • To investigate the role of intramitochondrial Abeta and its interaction with amyloid binding alcohol dehydrogenase (ABAD) in AD pathogenesis.
  • To explore the potential of targeting the Abeta-ABAD interaction as a therapeutic strategy for AD.

Main Methods:

  • Analysis of Abeta accumulation in mitochondria from AD patients and transgenic mouse models.
  • Assessment of mitochondrial function, including oxygen consumption and respiratory chain complex activities.
  • Evaluation of the impact of Abeta-ABAD interaction on reactive oxygen species (ROS) generation, energy metabolism, and cognitive deficits in a mouse model.

Main Results:

  • Intramitochondrial Abeta accumulation was confirmed in AD brains and models.
  • Abeta-mediated mitochondrial stress led to reduced oxygen consumption and impaired respiratory chain complex activities.
  • The interaction between intramitochondrial Abeta and ABAD exacerbated ROS production, impaired energy metabolism, and worsened cognitive deficits and neuropathology in AD mice.

Conclusions:

  • The interaction of intramitochondrial Abeta with ABAD is a key factor in AD pathogenesis.
  • Inhibiting the Abeta-ABAD interaction presents a promising therapeutic avenue for Alzheimer's disease.

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