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Mitochondria are related to synaptic pathology in Alzheimer's disease

Stavros J Baloyannis1

  • 1Department of Neurology, School of Medicine, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece.

International Journal of Alzheimer'S Disease
|September 17, 2011
PubMed

Insights

Mitochondrial changes in Alzheimer's disease neurons are linked to synaptic damage, not amyloid plaques. These alterations, including shape and size modifications, are prominent when the Golgi apparatus fragments.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Mitochondrial morphology is implicated in Alzheimer's disease (AD) pathogenesis.
  • Mitochondrial dysfunction is associated with oxidative stress and Aβ-peptide toxicity in AD.

Purpose of the Study:

  • To investigate and quantify mitochondrial morphological and morphometric changes in neurons from various brain regions of Alzheimer's disease autopsy specimens.

Main Methods:

  • Electron microscopy was used for morphological assessment.
  • Autopsy specimens from Alzheimer's disease patients were analyzed.
  • Morphometric analysis quantified mitochondrial size, shape, and cristae structure.

Main Results:

  • Significant mitochondrial morphological and morphometric alterations were observed in multiple brain regions, including the hippocampus, neocortex, and thalamus.
  • These changes included altered cristae, osmiophilic material accumulation, and modifications in mitochondrial shape and size.
  • Mitochondrial alterations correlated with dendritic spine depletion and loss of dendritic branches, and were associated with synaptic pathology.
  • No direct relationship was found between mitochondrial alterations and amyloid deposit accumulation; however, they were prominent when Golgi apparatus fragmentation was present.

Conclusions:

  • Mitochondrial morphological and morphometric changes are a significant feature in Alzheimer's disease neurons across various brain regions.
  • These mitochondrial alterations are linked to neuronal structural damage, including dendritic pathology and synaptic dysfunction, rather than directly to amyloid deposition.
  • The findings suggest mitochondrial health is critical in Alzheimer's disease and may be influenced by Golgi apparatus integrity.

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