Anterior cingulate cortex in individuals with depressive symptoms: A structural MRI study.

Area of Science:

• Neuroscience
• Psychiatry
• Radiology

Background:

• Previous magnetic resonance imaging (MRI) studies show inconsistent findings regarding anterior cingulate cortex (ACC) volume reductions in major depressive disorder (MDD).
• Small sample sizes in prior research limit definitive conclusions on ACC volumetric changes in MDD.
• The relationship between depressive symptom severity and ACC volume requires further investigation in large, diverse populations.

Purpose of the Study:

• To investigate the association between current depressive symptoms and ACC volume in a large community sample.
• To determine if ACC volumetric differences are related to the severity of self-reported depressive symptoms in adults.

Main Methods:

• A cross-sectional structural MRI study was conducted on 1803 adult participants.
• Multiple linear regression analyses predicted right and left ACC volumes using Quick Inventory of Depressive Symptomatology Self-Report (QIDS-SR) scores and other covariates.
• Covariates included intracranial volume, age, sex, race/ethnicity, alcohol use, tobacco use, and psychotropic medication use.

Main Results:

• A significant negative association was found between QIDS-SR scores and right ACC volume, indicating reduced volume with increased depressive symptoms.
• No significant association was observed between QIDS-SR scores and left ACC volume.
• This negative association between QIDS-SR scores and right ACC volume was significant in males but not in females.

Conclusions:

• Right ACC volume is reduced in individuals experiencing greater self-reported depressive symptom severity.
• The association between reduced right ACC volume and depressive symptoms is sex-specific, being significant only in men.
• These findings contribute to understanding the neurobiological underpinnings of major depressive disorder and highlight potential sex differences.