Effect of chronic stress during adolescence in prefrontal cortex structure and function

Area of Science:

• Neuroscience
• Developmental Biology
• Psychology

Background:

• Critical periods of plasticity (CPPs) are key developmental windows for neuronal circuit development.
• The prefrontal cortex (PFC) CPP extends to early adulthood and involves perineuronal net (PNN) maturation around inhibitory interneurons.
• PNNs play a role in stabilizing neuronal circuits after critical periods.

Purpose of the Study:

• To investigate the impact of chronic stress on the structure and function of the adolescent rat PFC.
• To examine the effect of stress on PNN maturation in specific PFC regions (MPFC and OFC).
• To assess stress-induced behavioral changes related to PFC function.

Main Methods:

• Adolescent rats (P28) were exposed to chronic stress for 7, 15, and 35 days.
• Histochemical labeling was used to analyze the spatial distribution of PNNs in the MPFC and OFC.
• Behavioral tests were conducted to evaluate PFC-associated functions.

Main Results:

• Chronic stress significantly slowed PNN maturation in both the MPFC and OFC of adolescent rats.
• Stress exposure led to negative alterations in PFC-associated behaviors.
• The observed effects suggest a disruption of normal PFC development under chronic stress.

Conclusions:

• Chronic stress adversely affects adolescent PFC development by hindering PNN maturation.
• This developmental delay in the PFC may lead to impaired executive functions.
• Prolonged stress exposure in adolescent humans could risk stunted executive function development.