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Aged chimpanzees exhibit pathologic hallmarks of Alzheimer's disease.


ABSTRACT: Alzheimer's disease (AD) is a uniquely human brain disorder characterized by the accumulation of amyloid-beta protein (A?) into extracellular plaques, neurofibrillary tangles (NFT) made from intracellular, abnormally phosphorylated tau, and selective neuronal loss. We analyzed a large group of aged chimpanzees (n = 20, age 37-62 years) for evidence of A? and tau lesions in brain regions affected by AD in humans. A? was observed in plaques and blood vessels, and tau lesions were found in the form of pretangles, NFT, and tau-immunoreactive neuritic clusters. A? deposition was higher in vessels than in plaques and correlated with increases in tau lesions, suggesting that amyloid build-up in the brain's microvasculature precedes plaque formation in chimpanzees. Age was correlated to greater volumes of A? plaques and vessels. Tangle pathology was observed in individuals that exhibited plaques and moderate or severe cerebral amyloid angiopathy, a condition in which amyloid accumulates in the brain's vasculature. Amyloid and tau pathology in aged chimpanzees suggests these AD lesions are not specific to the human brain.

SUBMITTER: Edler MK 

PROVIDER: S-EPMC6343147 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Aged chimpanzees exhibit pathologic hallmarks of Alzheimer's disease.

Edler Melissa K MK   Sherwood Chet C CC   Meindl Richard S RS   Hopkins William D WD   Ely John J JJ   Erwin Joseph M JM   Mufson Elliott J EJ   Hof Patrick R PR   Raghanti Mary Ann MA  

Neurobiology of aging 20170801


Alzheimer's disease (AD) is a uniquely human brain disorder characterized by the accumulation of amyloid-beta protein (Aβ) into extracellular plaques, neurofibrillary tangles (NFT) made from intracellular, abnormally phosphorylated tau, and selective neuronal loss. We analyzed a large group of aged chimpanzees (n = 20, age 37-62 years) for evidence of Aβ and tau lesions in brain regions affected by AD in humans. Aβ was observed in plaques and blood vessels, and tau lesions were found in the form  ...[more]

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