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Updated: Jun 14, 2025
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Social Isolation Model: A Noninvasive Rodent Model of Stress and Anxiety
Published on: November 11, 2022
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Social Isolation Induces Sex-Specific Differences in Behavior and Gut Microbiota Composition in Stress-Sensitive Rats
Charlotte Hurst1, Gosia Zobel2, Wayne Young1
1AgResearch Ltd., Palmerston North, New Zealand.
Brain and Behavior
|June 11, 2025
Summary
Social isolation in Wistar Kyoto rats altered the gut microbiome, particularly in females, suggesting potential links to mood-related behaviors like depression. Dietary interventions targeting specific bacteria may be beneficial.
Area of Science:
- Neuroscience
- Microbiology
- Behavioral Science
Background:
- Social isolation (SI) is a chronic stress model.
- Wistar Kyoto (WKY) rats are sensitive to stress.
- Brain-gut interactions and mood are explored.
Purpose of the Study:
- Investigate sex-specific behavioral changes in WKY rats due to SI.
- Determine the impact of SI on the WKY rat microbiome.
- Explore brain-gut-microbiome axis in stress.
Main Methods:
- Rats were individually housed (IH) or pair-housed (PH).
- Behavioral tests included modified open field (OFTmod), elevated plus maze (EPM), and novel object recognition (NOR).
- Shotgun metagenome sequencing analyzed cecal microbiome composition.
Main Results:
- IH rats, especially females, showed increased center time in OFTmod, potentially indicating depression.
- SI altered female rat cecal microbiome composition significantly.
- Relationships observed between behavioral traits and microbiome taxa abundance.
Conclusions:
- Behavioral responses to housing were minimal, but center time in OFTmod may suggest depression.
- Housing status differentially impacted the microbiome in females versus males.
- Dietary interventions targeting Bifidobacteria, Alistipes, and Muribaculaceae warrant further investigation.
