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Impaired proteasome function in Alzheimer's disease
J N Keller1, K B Hanni, W R Markesbery
1Sanders-Brown Center on Aging and Alzheimer's Disease Research Center Department of Neurology, University of Kentucky, Lexington, Kentucky, USA.
Journal of Neurochemistry
|June 15, 2000
Summary
Proteasome activity is significantly reduced in Alzheimer's disease (AD) brains, particularly in key memory regions. This suggests proteasome inhibition may drive neurodegeneration in AD.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Proteasome inhibition causes neuron death.
- Altered proteasome activity in neurodegenerative disorders remains unproven.
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
Purpose of the Study:
- To investigate proteasome activity in Alzheimer's disease (AD) brains.
- To determine if proteasome activity is altered in specific brain regions affected by AD.
Main Methods:
- Analysis of proteasome activity in postmortem brain tissue.
- Comparison between 16 Alzheimer's disease (AD) patients and 9 age- and sex-matched controls.
- Examination of proteasome activity across different brain regions (hippocampus, parahippocampal gyrus, temporal gyri, inferior parietal lobule, occipital lobe, cerebellum).
Main Results:
- Significant decrease in proteasome activity observed in AD brains: hippocampus/parahippocampal gyrus (48%), superior/middle temporal gyri (38%), inferior parietal lobule (28%).
- No significant decrease in proteasome activity in the occipital lobe or cerebellum of AD patients.
- Reduced proteasome activity correlated with posttranslational modification, not reduced protein expression.
Conclusions:
- Proteasome inhibition is implicated in Alzheimer's disease (AD) neurodegeneration.
- Specific brain regions are disproportionately affected by reduced proteasome activity in AD.
- Further research into proteasome regulation and posttranslational modifications in AD is warranted.