Related Experiment Videos
Senile plaques and neurofibrillary changes in the brain of an aged lemurian primate, Microcebus murinus
1Laboratorie de Neuromorphologie Fonctionnelle, Ecole Pratique des Hautes Etudes Université de Montpellier II, France.
Abstract:
In some aged Microcebus brains (8- to 11-year-old animals) dramatic atrophy is found, particularly of the cortex, the hippocampus, the basal ganglia, the brainstem and the cerebellum, associated with a conspicuous increase in the size of the cerebral ventricles. These morphological changes are accompanied by certain histological profiles indicative of pathology. In the cortex, these histological changes consist of 1) a large number of senile plaques composed of degenerated neurites sometimes surrounding an amyloid plaque, 2) amyloid deposits in the vascular walls and 3) dense bundles of argyrophilic filaments in numerous pyramidal neurons. All these lesions resemble changes associated with Alzheimer's disease in man. The degenerative changes observed in the Microcebus brain are accompanied by behavioral changes. At the moment these preliminary studies, carried out on the smallest of all primates, do not prove that the degeneration is of the Alzheimer type, but do indicate that Microcebus murinus may well be a good model for the study of cerebral aging, providing a comparison with cerebral ageing in humans. The size, life span and cost of the animal provide further advantages when compared with other nonhuman primates.
Insights
Aged Microcebus brains show significant atrophy and Alzheimer's-like changes, suggesting this primate is a valuable model for studying brain aging in humans.
Area of Science:
- Neuroscience
- Primate Research
- Aging Studies
Background:
- Aged primate brains can exhibit neurodegenerative changes.
- Microcebus murinus (mouse lemur) is the smallest primate, offering potential advantages for research.
- Understanding age-related brain changes is crucial for human health.
Purpose of the Study:
- To investigate neuropathological changes in aged Microcebus brains.
- To evaluate Microcebus murinus as a model for studying human cerebral aging and Alzheimer's disease.
Main Methods:
- Morphological analysis of aged Microcebus brains (8-11 years old).
- Histological examination of cortical tissue for pathological markers.
- Behavioral observation of aged animals.
Main Results:
- Significant brain atrophy observed in aged Microcebus, particularly in the cortex, hippocampus, basal ganglia, brainstem, and cerebellum.
- Increased cerebral ventricle size noted.
- Histological findings include senile plaques, vascular amyloid deposits, and neurofibrillary tangles, resembling Alzheimer's disease pathology.
- Behavioral changes accompanied the observed degenerative changes.
Conclusions:
- Aged Microcebus brains display neuropathological features similar to human Alzheimer's disease.
- Microcebus murinus presents a promising model for studying cerebral aging and neurodegeneration due to its size, lifespan, and cost-effectiveness.
- Further research is warranted to confirm the Alzheimer's-like nature of these changes.