Anterior cingulate cortex neuro-metabolic changes underlying lithium-induced euthymia in bipolar depression: A
M G Soeiro-de-Souza1, E Scotti-Muzzi1, F Fernandes1
1Department and Institute of Psychiatry, School of Medicine, University of Sao Paulo, Brazil.
Summary
Lithium treatment normalized brain metabolites in bipolar depression patients who recovered. Elevated brain Myo-inositol/Cr and Choline/Cr in bipolar depression returned to normal levels after successful lithium treatment.
Area of Science:
- Neuroscience
- Psychiatry
- Biochemistry
Background:
- Bipolar depression (BDep) presents diagnostic and treatment challenges.
- Brain neuro-metabolites investigated via proton magnetic resonance spectroscopy (¹H-MRS) are crucial for understanding mood disorders.
- Longitudinal studies linking ¹H-MRS metabolic changes to clinical outcomes in BDep are limited.
Purpose of the Study:
- To longitudinally assess anterior cingulate cortex (ACC) ¹H-MRS metabolites in BDep patients.
- To correlate these metabolic changes with clinical improvement (euthymia) after lithium treatment.
- To compare metabolite levels with matched healthy controls (HC).
Main Methods:
- Utilized 3-Tesla brain ¹H-MRS with a single-voxel PRESS sequence in the ACC.
- Recruited 28 medication-free BDep patients and 28 matched HC at baseline.
- Re-scanned 14 BDep patients after 6 weeks of lithium treatment upon achieving euthymia.
Main Results:
- BDep patients exhibited higher baseline Myo-inositol/Cr (mI/Cr) and Choline/Cr (Cho/Cr) compared to HC.
- After lithium treatment, euthymic BDep patients showed normalized mI/Cr and Cho/Cr levels, similar to HC.
- Non-responders maintained elevated Cho/Cr levels.
Conclusions:
- Elevated ACC mI/Cr and Cho/Cr in BDep may reflect abnormal membrane phospholipid metabolism and phosphatidylinositol (PI) cycle activity.
- Lithium treatment appears to regulate the PI cycle, crucial for mood regulation, evidenced by normalized metabolite levels.
- These findings highlight ¹H-MRS as a tool to monitor treatment response in BDep.
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