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Familial influence on plaque formation in the beagle brain
M J Russell1, R White, E Patel
1Department of Anesthesiology, University of California, Davis 95616.
Neuroreport
|December 1, 1992
Summary
Aged dogs show brain changes similar to Alzheimer's disease. Familial factors influence plaque development, though plaques rarely progress to the severe form seen in human Alzheimer's disease.
Area of Science:
- Neuroscience
- Comparative Pathology
- Gerontology
Background:
- Aged canines share central neuropathological similarities with human Alzheimer's disease patients.
- Investigating Alzheimer-like pathology in canines offers insights into disease mechanisms.
- Controlled environments minimize confounding variables in aging studies.
Purpose of the Study:
- To examine Alzheimer-like neuropathology in aged, purebred beagles from a controlled environment.
- To determine the incidence and characteristics of plaques in canine brain tissue.
- To explore potential familial influences and progression of Alzheimer-like pathology in dogs.
Main Methods:
- Brain tissue analysis from 29 aged beagles (mean age 15.6 years).
- Histopathological examination for amyloid plaques, classifying them as diffuse or neuritic.
- Statistical analysis to assess plaque density, age independence, and familial aggregation.
Main Results:
- 65.5% of dogs exhibited plaques; 19 samples showed Alzheimer-like pathology.
- Plaques were most dense in the perirhinal and temporal cortex.
- Familial influence was significant (p < 0.001), with congruence in 15 of 16 litters.
- Plaque density was not correlated with age.
- Diffuse plaques were rarely observed to convert to dense neuritic plaques.
Conclusions:
- Aged beagles develop Alzheimer-like neuropathology, primarily diffuse plaques.
- Familial predisposition plays a role in canine plaque development.
- Canine models may offer unique insights, but plaque progression differs from human Alzheimer's disease.
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