Prefrontal Cortex Dysfunction Increases Susceptibility to Schizophrenia-Like Changes Induced by Adolescent Stress...

Area of Science:

• Neuroscience
• Psychiatry
• Developmental Psychology

Background:

• Adolescent stress is a known risk factor for schizophrenia.
• Medial prefrontal cortex (mPFC) dysfunction may impair stress control, heightening vulnerability.
• Long-term effects of adolescent stress on adult behavior and neurobiology are critical to understand.

Purpose of the Study:

• To investigate how different adolescent stressors (restraint stress, footshock, or combined) impact adult behaviors relevant to schizophrenia.
• To assess the effects on anxiety, cognition, and dopamine (DA) system responsivity.
• To explore the role of prelimbic mPFC in mediating stress-induced DA changes.

Main Methods:

• Rats were exposed to different stressors during adolescence.
• Adult behavioral tests included elevated plus-maze (anxiety) and novel-object recognition (cognition).
• Dopamine system responsivity was measured via amphetamine-induced locomotion and in vivo electrophysiology of ventral tegmental area (VTA) DA neurons.

Main Results:

• All stressors impaired weight gain and induced adult anxiety-like behaviors.
• Footshock and combined stressors disrupted cognitive function.
• Only combined stressors led to DA hyper-responsivity (increased locomotor response to amphetamine, more active lateral VTA DA neurons).
• Prelimbic mPFC lesions induced DA hyper-responsivity in rats exposed to footshock alone.

Conclusions:

• Adolescent stress induces lasting behavioral changes, with intense/multiple stressors affecting the dopamine system.
• Prelimbic mPFC dysfunction may contribute to stress-induced DA system alterations and vulnerability.
• Stress during adolescence could be a key factor in schizophrenia development; interventions may prevent psychosis.