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Related Experiment Video

Updated: Jul 6, 2026

Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology

Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology

Published on: March 23, 2011

Synapses are lost during aging in the primate prefrontal cortex.

A Peters¹, C Sethares, J I Luebke

¹Department of Anatomy and Neurobiology, Boston University School of Medicine, 715 Albany Street, Boston, MA 02118-2526, USA. apeteres@cajal-1.bu.edu

|March 11, 2008

Summary

This summary is machine-generated.

Aging reduces synapse numbers in the frontal cortex, particularly asymmetric synapses in layers 2/3, correlating with cognitive decline in rhesus monkeys.

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Area of Science:

Neuroscience
Aging Research
Cognitive Science

Background:

Synaptic density changes with age, potentially impacting cognitive function.
Area 46 of the frontal cortex is crucial for cognitive processes.
Previous research indicates age-related myelin alterations also contribute to cognitive decline.

Purpose of the Study:

To investigate the effects of aging on excitatory and inhibitory synapse numerical density in rhesus monkey frontal cortex.
To correlate age-related synaptic changes with cognitive impairment.
To compare synaptic changes in different cortical layers (2/3 vs. 5).

Main Methods:

Electron microscopic analysis of synapses in area 46 of rhesus monkey frontal cortex.
Behavioral testing to assess cognitive function.
Correlation analysis between synaptic density and cognitive impairment scores.

Main Results:

A 30% loss of synapses in layers 2/3 and a 20% loss in layer 5 with age.
Asymmetric synapses were primarily lost in layer 5, while both types were lost in layers 2/3.
Strong correlation between asymmetric synapse loss in layers 2/3 and cognitive impairment.

Conclusions:

Age-related synapse loss, especially asymmetric synapses in superficial layers, contributes to cognitive decline.
Synaptic changes in layer 5 show less correlation with cognitive impairment.
Cognitive impairment is multifactorial, involving both synaptic and myelin alterations.