[Distinct prefrontal neuronal circuits determine repeated stress-induced behavioral styles in mice]

Area of Science:

• Neuroscience
• Psychiatry
• Molecular Biology

Background:

• Stressful experiences can trigger or worsen mental health conditions like depression.
• Individual differences in how stress affects behavior are not well understood.
• Preclinical models lack subtype-based approaches to study stress's neurobiological impact.

Purpose of the Study:

• To explore how neural circuits, cellular processes, and molecular mechanisms shape stress-induced behavioral variability.
• To implement a behavioral subtyping strategy in preclinical research.
• To understand the biological basis of individual differences in stress responses.

Main Methods:

• Classified stressed male mice into four distinct behavioral subtypes based on social withdrawal and anhedonia.
• Investigated neural projection pathways from the prefrontal cortex.
• Analyzed molecular mechanisms, including gene expression and epigenetic regulation.

Main Results:

• Identified four distinct behavioral subtypes in stressed mice.
• Found three prefrontal cortex neural projection pathways mediate stress-related behaviors.
• Discovered that epigenetic repression of the Shisa2 gene by KDM5C in the medial prefrontal cortex (mPFC) to anterior paraventricular thalamus (aPVT) pathway underlies social deficits and anhedonia.

Conclusions:

• Distinct biological factors contribute to individual differences in stress-induced behaviors.
• Specific neural pathways and molecular mechanisms, including epigenetic regulation, are critical.
• Highlights the importance of subtype-based approaches in understanding stress and mental health.