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Apolipoprotein E, plaques, tangles and cholinergic dysfunction in Alzheimer's disease
1Department of Neurology and Neurosurgery, McGill University, Verdun, PQ, Canada.
Annals of the New York Academy of Sciences
|January 17, 1996
Summary
The apolipoprotein E (ApoE) epsilon 4 allele is linked to Alzheimer's disease pathology, correlating with increased senile plaques and neurofibrillary tangles. ApoE4 also impairs beta-amyloid's neuroprotective effects in neurons.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Apolipoprotein E (ApoE) is crucial for lipoprotein metabolism in the brain.
- Apolipoprotein E has three common alleles: epsilon 2, epsilon 3, and epsilon 4, coding for ApoE2, ApoE3, and ApoE4 proteins.
- The ApoE epsilon 4 allele is significantly associated with late-onset Alzheimer's disease.
Purpose of the Study:
- To investigate the relationship between apolipoprotein E genotype and neuropathological hallmarks of Alzheimer's disease.
- To explore the functional role of ApoE4 in neuronal interactions with beta-amyloid protein.
Main Methods:
- Examined neuropathological hallmarks: neurofibrillary tangles, senile plaques, and choline acetyltransferase activity in relation to ApoE genotype.
- Utilized cultured rat hippocampal neurons to study ApoE protein interactions with beta-amyloid.
Main Results:
- Significant correlations found between epsilon 4 allele copy number and increased senile plaque density in multiple cortical areas.
- Increased neurofibrillary tangle number in frontal and fusiform cortex correlated with epsilon 4 allele presence.
- ApoE4 reversed beta-amyloid's neuroprotective effects, while ApoE3 enhanced beta-amyloid peptide internalization in cultured neurons.
Conclusions:
- Apolipoprotein E epsilon 4 allele is implicated in the pathogenesis of Alzheimer's disease.
- Findings provide insights into the functional mechanisms by which ApoE4 contributes to Alzheimer's disease pathology.