Bearded capuchin monkeys as a model for Alzheimer's disease

Area of Science:

• Neuroscience
• Primate Research
• Alzheimer's Disease Pathogenesis

Background:

• Alzheimer's disease (AD) research is hindered by the lack of suitable natural animal models.
• Nonhuman primates offer a closer phylogenetic link to humans than rodent models, potentially developing AD-like pathology spontaneously.

Purpose of the Study:

• To investigate the potential of capuchin monkeys as an animal model for Alzheimer's disease.
• To characterize spontaneous Alzheimer-type neuropathology in aged capuchin monkeys.

Main Methods:

• Structural 7 Tesla MRI analysis of one capuchin brain.
• Neuropathological evaluation of three aged capuchin monkeys.
• Assessment of beta-amyloid and tau pathology, including plaque morphology and neuroinflammation.

Main Results:

• Two of three aged capuchins exhibited Alzheimer-type pathology.
• Widespread beta-amyloid deposits and mature plaques were observed, with associated dystrophic neurites and axonal transport disruption.
• Abnormal hyperphosphorylated tau aggregates and astrocyte hypertrophy were present, indicative of neuroinflammation.

Conclusions:

• Aged capuchin monkeys can spontaneously develop key neuropathological features of Alzheimer's disease.
• Capuchin monkeys represent a promising, phylogenetically relevant animal model for studying AD pathogenesis and testing therapeutic interventions.