Related Experiment Video
Updated: Jun 23, 2025
04:20
Social Isolation Model: A Noninvasive Rodent Model of Stress and Anxiety
Published on: November 11, 2022
4.2K
Social Isolation Induces Changes in the Monoaminergic Signalling in the Rat Medial Prefrontal Cortex
Vivien Csikós1, Fanni Dóra2, Tamás Láng2
1Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Eötvös Loránd University, 1117 Budapest, Hungary.
Cells
|June 26, 2024
Summary
Short-term social isolation in adult male rats alters social behaviors and gene expression in the medial prefrontal cortex (mPFC). Key genes involved in dopaminergic and peptidergic signaling were identified, highlighting their role in social regulation.
Area of Science:
- Neuroscience
- Behavioral Science
- Genomics
Background:
- The behavioral and transcriptomic impacts of short-term social isolation in adult male rats, specifically within the medial prefrontal cortex (mPFC), remain incompletely understood.
- Previous research has not fully characterized the behavioral consequences or gene expression changes associated with adult social isolation in this brain region.
Purpose of the Study:
- To investigate the behavioral effects of 10-day social isolation in adult male rats.
- To identify accompanying gene expression alterations in the mPFC using RNA sequencing.
- To elucidate the molecular mechanisms underlying social behavior regulation in the mPFC.
Main Methods:
- Adult male rats were housed in pairs or individually for 10 days.
- Behavioral tests were conducted to assess sociability, social novelty preference, social interaction, aggression, anxiety, and depression-like behaviors.
- RNA sequencing was employed to analyze gene expression profiles in the mPFC.
- KEGG pathway analysis was used to identify enriched biological pathways.
- Specific gene expression changes were validated using molecular techniques, and functional roles were confirmed through pharmacological manipulation.
Main Results:
- Isolated rats showed reduced sociability and social novelty preference but increased social interaction.
- No significant changes were observed in aggression, anxiety, or depression-like behaviors.
- Transcriptomic analysis revealed differential expression of 46 genes in the mPFC.
- KEGG analysis indicated involvement in neuroactive ligand-receptor interactions, particularly dopaminergic, peptidergic systems, and addiction pathways.
- Validation confirmed decreased levels of Rgs9, Htr2c, and Pdyn, genes implicated in dopaminergic, serotonergic, and peptidergic functions.
- Antagonizing serotonin receptor 2c (Htr2c) confirmed its role in social novelty discrimination.
Conclusions:
- Social isolation in adult male rats induces specific behavioral changes and significant alterations in mPFC gene expression.
- The identified differentially expressed genes, particularly those in dopaminergic and peptidergic systems, are crucial for social homeostasis.
- These findings underscore the involvement of monoaminergic and peptidergic systems within the mPFC in regulating social behaviors and responding to social isolation.
