Quantitative Susceptibility Mapping Reveals an Association between Brain Iron Load and Depression Severity

Area of Science:

• Neuroimaging
• Neurochemistry
• Psychiatry

Background:

• Previous studies show inconsistent findings regarding serum ferritin levels in depression.
• Brain iron concentration has not been previously investigated in depression using quantitative susceptibility mapping (QSM).

Purpose of the Study:

• To investigate brain iron concentration in patients with mild-moderate depression (MD) and major depression disorder (MDD) using QSM.
• To evaluate the relationship between brain iron concentration and depression severity.

Main Methods:

• Quantitative susceptibility mapping (QSM) was used to assess brain iron concentration via MR scans.
• Participants included 30 MD patients, 14 MDD patients, and 20 controls.
• Depression severity was assessed using the 17-item Hamilton Depression Rating Scale (HDRS).

Main Results:

• Significantly increased susceptibility values (indicating higher iron concentration) were found in the bilateral putamen of MDD patients compared to MD patients and controls.
• A significant difference in susceptibility values was observed in the left thalamus of MDD patients compared to controls.
• No significant difference in susceptibility values was found between MD patients and controls.
• Susceptibility values positively correlated with HDRS scores, indicating a link to depression severity.

Conclusions:

• Brain iron deposition is associated with major depression disorder (MDD).
• QSM may serve as a biomarker for investigating the pathophysiological mechanisms of depression.
• Elevated brain iron in specific regions like the putamen may be a characteristic of MDD.