Age-related behavioral and ultrastructural changes in the rat amygdala
Nino Lomidze1, Mzia G Zhvania1,2, Yousef Tizabi3
1School of Life Sciences and Medicine, Ilia State University, Tbilisi, GA, USA.
Developmental Neurobiology
|October 24, 2020
Summary
Aged rats exhibited increased anxiety-like behaviors and altered amygdala ultrastructure, suggesting compensatory mechanisms may offer therapeutic targets for aging-related emotional changes.
Area of Science:
- Neuroscience
- Aging Research
- Behavioral Biology
Background:
- Emotional changes are common during aging.
- Understanding the neurobiological basis of these changes is crucial for potential interventions.
- Anxiety is a prevalent emotional manifestation in the aging population.
Purpose of the Study:
- To investigate anxiety-like behaviors in aged rats.
- To examine the associated ultrastructural changes in the central nucleus of the amygdala (CNA).
- To explore the neurobiological underpinnings of aging-related emotional alterations.
Main Methods:
- Comparative study across adolescent, adult, and aged rat groups.
- Behavioral testing using the elevated plus maze to assess anxiety.
- Transmission electron microscopy (EM) for ultrastructural and presynaptic architecture evaluation of the CNA.
Main Results:
- Aged rats displayed significantly higher anxiety-like behaviors compared to younger groups.
- EM analysis revealed reduced presynaptic area and synapse number in aged rats' CNA.
- Unexpectedly, aged rats showed an increased number of presynaptic mitochondria in the CNA.
Conclusions:
- Aging is associated with increased anxiety and specific ultrastructural modifications in the amygdala.
- The increased number of presynaptic mitochondria suggests compensatory mechanisms are active during aging.
- These compensatory mechanisms represent potential therapeutic targets for interventions in the aging population.
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