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Related Experiment Videos

Beta-amyloid accumulation correlates with cognitive dysfunction in the aged canine

B J Cummings1, E Head, A J Afagh

  • 1Institute for Brain Aging and Dementia, University of California at Irvine, Irvine, California, 92717-4550, USA.

Neurobiology of Learning and Memory
|July 1, 1996
PubMed
Summary

Beta-amyloid plaques in aging canines are linked to cognitive decline in specific learning tasks. This suggests beta-amyloid may contribute to age-related cognitive dysfunction before neurofibrillary tangles appear.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Comparative Cognition

Background:

  • Alzheimer's disease is characterized by beta-amyloid accumulation, but its direct link to cognitive decline is debated, often confounded by neurofibrillary tangles.
  • Aging is associated with cognitive changes and can involve beta-amyloid deposition.
  • Canine models offer a unique opportunity to study age-related cognitive changes without the confounding factor of neurofibrillary tangles.

Purpose of the Study:

  • To investigate the relationship between beta-amyloid accumulation and cognitive function in an aging animal model lacking neurofibrillary tangles.
  • To determine if beta-amyloid deposition correlates with specific cognitive deficits in aged canines.

Main Methods:

  • Twenty aged canines (beagles and mongrels) underwent a battery of six cognitive tasks.

Related Experiment Videos

  • Post-mortem analysis identified and quantified beta-amyloid plaques in brain regions including the entorhinal cortex, frontal cortex, and cerebellum.
  • Computerized image analysis was used to measure beta-amyloid deposition.

    • Main Results:

    • Aged canines exhibited deficits in Discrimination, Reversal, and Spatial learning and memory tasks.
    • Beta-amyloid plaques, all of the diffuse subtype and some containing intact neurons, were prevalent in older animals.
    • Increased beta-amyloid deposition significantly correlated with deficits in Discrimination (r = .80), Reversal (r = .65), and Spatial learning (r = .54).

    Conclusions:

    • Beta-amyloid deposition is strongly associated with specific cognitive impairments in aging canines.
    • These findings suggest that beta-amyloid may be a contributing factor to age-related cognitive dysfunction.
    • This occurs independently of, and potentially prior to, the formation of neurofibrillary tangles.