Neurobiological Effects of Social Isolation in Rodent Models

Social isolation in rodents induces a spectrum of behavioural, cellular and molecular changes that model aspects of stress‐related psychiatric disorders. During juvenile development, lack of peer interaction disrupts the maturation of prefrontal cortical circuits, leading to persistent deficits in social approach and decision‐making. In adulthood, even brief periods of isolation diminish social motivation, alter anxiety‐ and depressive‐like behaviours and provoke transcriptomic remodelling in key brain regions. Across various paradigms, alterations in monoaminergic systems (dopamine, serotonin), neuropeptidergic signalling and glutamate receptor expression have been documented. These shifts co‐occur with reductions in neuroplasticity markers such as BDNF and immediate early genes in both prefrontal cortex and hippocampus. At the synaptic level, isolation impairs dendritic spine maturation and long‐term potentiation, undermining circuit stability. Collectively, rodent models reveal that social deprivation engages stress neurocircuitry, perturbs homeostatic neurotransmission and compromises the structural substrates of learning and social memory, providing a translational framework for understanding the neurobiology of loneliness and related disorders.

Research from Nature Portfolio

Recent studies have pinpointed a critical role for parvalbumin‐positive interneurons in the dorsal medial prefrontal cortex. In a seminal investigation, juvenile social isolation was shown to arrest the functional maturation of these interneurons, uncoupling their activation from the initiation of active social approach in adulthood. Optogenetic and chemogenetic restoration of interneuron activity in the adult prefrontal cortex successfully rescued sociability deficits, demonstrating that experience‐dependent maturation of interneuron microcircuits is essential for normal social behaviour.

Neurobiological Effects of Social Isolation in Rodent Models publication trend

The graph below shows the total number of articles in neurobiological effects of social isolation in rodent models across all publications each year (not limited to Nature Index journals).

Technical terms

Parvalbumin‐positive interneuron: A class of inhibitory neuron expressing the calcium-binding protein parvalbumin, crucial for timing of cortical network activity.

Medial prefrontal cortex (mPFC): A brain region involved in executive function, social behaviour and emotional regulation.

Monoaminergic signalling: Neurotransmission mediated by monoamines (dopamine, serotonin, norepinephrine) that modulates mood and motivation.

Neuroplasticity: The capacity of neural circuits to change in structure or function in response to experience or injury.

Dendritic spine: A small protrusion on a neuron’s dendrite where excitatory synapses form, essential for synaptic strength and plasticity.

Brain‐derived neurotrophic factor (BDNF): A growth factor that supports neuron survival, differentiation and synaptic modulation.

References

1. Prefrontal parvalbumin interneurons require juvenile social experience to establish adult social behavior. Nature Communications (2020).
2. Social Isolation Induces Changes in the Monoaminergic Signalling in the Rat Medial Prefrontal Cortex. Cells (2024).
3. Social Isolation Stress Induces Anxious‐Depressive‐Like Behavior and Alterations of Neuroplasticity‐Related Genes in Adult Male Mice. Neural Plasticity (2016).
4. Altered Behavior in Mice Socially Isolated During Adolescence Corresponds With Immature Dendritic Spine Morphology and Impaired Plasticity in the Prefrontal Cortex. Frontiers in Behavioral Neuroscience (2018).