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Is Alzheimer's disease a mitochondrial disorder?
Adam D Cash1, George Perry, Osamu Ogawa
1Institute of Pathology, Case Western Reserve University, Cleveland, Ohio 44106, USA.
Summary
Alzheimer's disease (AD) neurons show oxidative damage, particularly from abnormal mitochondria acting as a "radical factory." Mitochondrial dysfunction, possibly linked to cell cycle re-entry, drives this neuronal damage.
Area of Science:
- Neuroscience
- Cell Biology
- Oxidative Stress Research
Background:
- Neurons vulnerable to death in Alzheimer's disease (AD) exhibit increased oxidative damage markers.
- These oxidative changes are less pronounced in neurons with neurofibrillary pathology.
Purpose of the Study:
- To review recent findings on key abnormalities initiating and promoting neuronal oxidative damage in AD.
- To explore the role of mitochondrial dysfunction in AD pathogenesis.
Main Methods:
- Review of existing in vivo and in vitro studies.
- Analysis of oxidative damage markers in neurons.
- Investigation of mitochondrial function and cellular processes in AD.
Main Results:
- Abnormal mitochondria are implicated as a source of reactive oxygen species, leading to neuronal oxidative damage.
- Mitochondria in AD neurons may supply reactants that generate radicals in the cytoplasm.
- The juxtaposition of abnormal mitochondria, hydrogen peroxide (H2O2), and redox-active iron creates a 'radical factory' environment.
- Evidence suggests mitochondrial abnormalities are linked to neuronal cell cycle re-entry, increased proliferation, and turnover.
Conclusions:
- Mitochondrial dysfunction is a significant contributor to neuronal oxidative damage in Alzheimer's disease.
- Cell cycle re-entry may be a proximal cause of mitochondrial abnormalities driving AD pathology.
- Understanding these mechanisms is crucial for developing therapeutic strategies against AD.