Neuroanatomic Differences Associated With Stress Susceptibility and Resilience

Area of Science:

• Neuroscience
• Neuroimaging
• Stress Research

Background:

• Investigating neurobiological mechanisms of stress susceptibility.
• Utilizing structural magnetic resonance imaging (sMRI) and diffusion tensor imaging (DTI).
• Identifying neuroanatomic differences between stress-susceptible and resilient mice.

Purpose of the Study:

• Determine neuroanatomic differences in stress susceptibility.
• Examine synchronized anatomic differences between brain regions.
• Gain insight into neural network plasticity in stress susceptibility.

Main Methods:

• C57BL/6 mice subjected to 10-day social defeat stress.
• Behavioral testing for social avoidance.
• Ex vivo sMRI and DTI of mouse brains at high resolution.
• Correlation analysis of social avoidance with local brain volume and structural covariance.

Main Results:

• Social avoidance correlated with altered volumes in multiple brain regions, including the cingulate cortex, nucleus accumbens, VTA, and hippocampus.
• Increased fractional anisotropy observed in the hypothalamus and hippocampal CA3.
• Synchronized anatomic differences between brain regions (e.g., VTA-cingulate cortex, hippocampus-VTA) indicate altered structural covariance in susceptible mice.

Conclusions:

• Stress-integrative brain regions are critical in shaping neural architecture.
• These regions underlie individual differences in susceptibility and resilience to chronic stress.
• Brain structural plasticity plays a key role in stress response.