Striatal circuit function is associated with prior self-harm in remitted major depression.

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Suicide risk neurobiology is not fully understood.
• Recurrent major depression (RMD) involves complex neural processes.
• Previous research suggests striatal circuit involvement in self-harm.

Purpose of the Study:

• Investigate the association between self-harm history and striatal circuit function in remitted RMD.
• Identify aberrant functional connectivity in the striatal-motor circuit.
• Explore if striatal and cortical midline circuit dysfunction persists in euthymic RMD patients.

Main Methods:

• Functional magnetic resonance imaging (fMRI) with a motor activation paradigm.
• Analysis of functional connectivity in 20 unmedicated RMD subjects and 21 controls.
• Correlational analyses to link functional connectivity with self-harm history.

Main Results:

• A significant association was found between self-harm history and striatal-motor circuit functional connectivity.
• Remitted RMD patients showed decreased functional connectivity in striatal and cortical midline circuits compared to controls.
• Striatal circuit dysfunction was previously linked to self-harm in a depressive episode.

Conclusions:

• Striatal circuit function is critically implicated in the neurobiology of suicide and self-harm risk in RMD.
• Persistent dysfunction in striatal and cortical midline circuits during euthymia suggests trait pathology in RMD.
• These findings highlight potential neural markers for suicide risk assessment.