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Aging, stress, and cognitive function

A Levy¹, S Dachir, I Arbel

¹Department of Pharmacology, Israel Institute for Biological Research, Ness-Ziona.

Annals of the New York Academy of Sciences

|June 30, 1994

Summary

This study developed an animal model for stress-induced aging using corticosterone in rats. Middle-aged rats showed greater vulnerability to cognitive damage and hippocampal changes from this treatment.

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Area of Science:

Neuroscience
Aging Research
Endocrinology

Background:

Stress is linked to accelerated aging and neuronal damage.
Corticosterone, a key stress hormone, has been implicated in central nervous system lesions with prolonged exposure.

Purpose of the Study:

To establish an animal model simulating chronic stress-induced hormonal elevation.
To investigate the effects of sustained corticosterone administration on brain morphology and cognitive function in young and middle-aged rats.

Main Methods:

Continuous, slow-release administration of corticosterone to young (3-month-old) and middle-aged (12-month-old) Fischer 344 rats.
Assessment of plasma corticosterone levels for stability and diurnal variation.
Evaluation of hippocampal morphology (CA1, CA4, dentate gyrus) and cognitive performance using the Morris water maze and eight-arm radial maze.

Main Results:

Sustained corticosterone treatment induced morphological changes in the hippocampus, particularly in CA1, CA4, and dentate gyrus regions.
Middle-aged rats exhibited greater vulnerability to long-term corticosterone effects compared to young rats.
Rats initially classified as cognitively 'nonimpaired' showed severe cognitive deficits in the radial maze after treatment, indicating sensitivity to the model.

Conclusions:

The developed animal model effectively simulates stress-related hormonal elevation and its detrimental effects on the brain.
This model is valuable for studying age-related cognitive decline and testing neuroprotective agents against stress-induced brain changes.

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