Striatal volume abnormalities in treatment-naïve patients diagnosed with pediatric major depressive disorder

Area of Science:

• Neuroscience
• Psychiatry
• Developmental Psychology

Background:

• The striatum, comprising the putamen and caudate, is crucial for executive and emotional functions.
• Mood disorders may involve striatal pathophysiology, yet research on pediatric major depressive disorder (MDD) is limited.
• Structural brain abnormalities in pediatric MDD require further investigation.

Purpose of the Study:

• To investigate striatal volume differences in medication-naïve pediatric patients with MDD compared to healthy controls.
• To identify specific volumetric abnormalities in the putamen and caudate in pediatric MDD.
• To explore correlations between striatal volumes, depression severity, and age in pediatric MDD.

Main Methods:

• Volumetric magnetic resonance imaging (MRI) was performed on 27 medication-naïve pediatric MDD patients and 26 healthy controls.
• Manual tracing of putamen and caudate volumes was conducted by a blinded rater.
• Analysis of covariance (ANCOVA) compared groups, adjusting for age, sex, IQ, and total brain volume.

Main Results:

• MDD patients exhibited significantly smaller right striatum (6.0%) and right caudate (7.4%) volumes compared to controls.
• A significant inverse correlation was found between left caudate volume and depression severity in MDD patients.
• In MDD patients, age was inversely correlated with left and right putamen volumes, unlike in controls.

Conclusions:

• Findings indicate significant striatal volume abnormalities in medication-naïve pediatric MDD.
• The striatum's potential role in the pathophysiology of pediatric MDD is supported.
• These results highlight the striatum as a potential target for understanding and treating pediatric depression.