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Related Experiment Video

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Senile plaques in aged squirrel monkeys.

L C Walker, C A Kitt, E Schwam

Neurobiology of Aging

|July 1, 1987

Summary

This summary is machine-generated.

Aged squirrel monkeys develop brain senile plaques, similar to those in humans and rhesus monkeys. These plaques, composed of abnormal neurites and amyloid cores, are found in various brain regions.

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Area of Science:

Neuroscience
Primate Research
Aging Studies

Background:

Senile plaques are a hallmark of Alzheimer's disease and aging in humans.
Previous research has identified similar neuropathological changes in aged rhesus monkeys.
The presence and characteristics of senile plaques in squirrel monkeys, a New World primate, are less understood.

Purpose of the Study:

To investigate the occurrence and characteristics of senile plaques in aged squirrel monkeys.
To compare the distribution and composition of senile plaques in squirrel monkeys with those in Old World primates and humans.

Main Methods:

Analysis of whole-hemisphere coronal brain sections from aged squirrel monkeys.
Histological examination to identify senile plaques.
Immunocytochemical staining to determine the composition of neurites within the plaques.

Main Results:

Aged squirrel monkeys exhibit senile plaques in brain regions including the temporal cortex, amygdala, and hippocampal formation.
Plaques are also found in orbitofrontal and frontal opercular cortical regions.
Immunocytochemistry revealed neurites immunoreactive for phosphorylated neurofilaments and neuropeptide Y.

Conclusions:

Squirrel monkeys develop brain senile plaques analogous to those in aged rhesus monkeys and humans.
The distribution and composition of these plaques suggest conserved neuropathological mechanisms across primate species.
This finding supports the use of squirrel monkeys as a model for studying age-related cognitive decline and neurodegenerative diseases.