Post-Weaning Social Isolation Disturbs Gene Expression in Rat Brain Structures

Area of Science:

• Neuroscience
• Molecular Biology
• Behavioral Science

Background:

• Post-weaning social isolation is a significant environmental stressor.
• Social isolation in rodents is known to induce behavioral and neurochemical alterations.

Purpose of the Study:

• To investigate the molecular mechanisms underlying behavioral changes induced by social isolation.
• To identify candidate genes involved in the pathogenesis of isolation-induced mental disorders.

Main Methods:

• Male Wistar rats were subjected to 10 weeks of social isolation.
• Behavioral assessments included aggressiveness, sensorimotor reactivity, and cognitive function (acoustic startle response).
• Gene expression analysis of key enzymes and transporters in various brain regions was performed using mRNA levels.

Main Results:

• Social isolation led to increased aggressiveness, sensorimotor reactivity, and cognitive deficits.
• Elevated expression of prolyl endopeptidase (EC 3.4.21.26) in the frontal cortex was observed.
• Increased serotonin transporter gene mRNA levels were found in the striatum and hypothalamus.

Conclusions:

• The serotonergic system plays a role in mental disorders induced by social isolation.
• The gene encoding prolyl endopeptidase is a potential candidate gene in the pathogenesis of isolation-induced mental disorders.