Grey matter volume reductions in the emotion network of patients with depression and coronary artery disease

Area of Science:

• Neuroscience
• Cardiology
• Psychiatry

Background:

• Coronary Artery Disease (CAD) and Major Depressive Disorder (MDD) frequently co-occur.
• A shared network of brain regions involved in emotion regulation, including the orbitofrontal cortex, amygdala/parahippocampal region, and insula, may link these conditions.

Purpose of the Study:

• To investigate structural differences in the emotion regulation network in patients with both CAD and MDD (CAD+MDD) compared to those with CAD alone, MDD alone, and healthy controls (CTRL).
• To determine if structural alterations in CAD+MDD patients align more with CAD or MDD-related circuitry.

Main Methods:

• Structural magnetic resonance imaging (MRI) scans were acquired from four groups: CAD+MDD (n=12), CAD (n=12), MDD (n=19), and CTRL (n=17).
• A region of interest (ROI) analysis focused on key brain areas within the emotion regulation network.

Main Results:

• CAD+MDD patients showed decreased grey matter volume in the bilateral orbitofrontal cortex, bilateral amygdala/parahippocampal gyrus, and right insula compared to CTRL.
• CAD+MDD patients exhibited reduced grey matter in bilateral amygdala/parahippocampal regions compared to CAD patients.
• Grey matter reductions were observed in the right orbitofrontal cortex for CAD+MDD versus MDD, and in the right insula for CAD versus CTRL.

Conclusions:

• The study supports the hypothesis that structural differences in the emotion regulation network are relevant to the co-occurrence of CAD and MDD.
• Findings suggest distinct and overlapping neural substrates underlying the relationship between CAD and MDD, particularly within emotion-processing brain regions.