Proton Magnetic Resonance Spectroscopy in Mood Disorders
Summary
Proton magnetic resonance spectroscopy (1H-MRS) is a non-invasive imaging modality that enables in vivo quantification of neurometabolites. By analysing the resonance frequencies of hydrogen nuclei in defined brain regions, it provides biochemical signatures associated with neuronal integrity, glial function and neurotransmitter cycling. In mood disorders, including major depressive disorder (MDD) and bipolar disorder (BD), 1H-MRS has elucidated abnormalities in key structures such as the anterior cingulate cortex, medial prefrontal cortex and hippocampus. Consistent findings include reduced N-acetyl aspartate (NAA) suggesting neuronal hypometabolism, altered glutamatergic indices (Glx, glutamate and glutamine) implicating excitatory–inhibitory imbalance, and fluctuations in gamma-aminobutyric acid (GABA) reflecting inhibitory neurotransmission deficits. These metabolite alterations correlate with symptom severity, illness phase and response to pharmacological and neuromodulatory interventions. Longitudinal investigations are beginning to characterise dynamic metabolite trajectories as candidate biomarkers for diagnosis, treatment stratification and monitoring of therapeutic efficacy, with potential global significance in improving personalised care for mood disorders.
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Proton Magnetic Resonance Spectroscopy in Mood Disorders publication trend
The graph below shows the total number of articles in proton magnetic resonance spectroscopy in mood disorders across all publications each year (not limited to Nature Index journals).
Technical terms
Proton magnetic resonance spectroscopy (1H-MRS): A non-invasive imaging technique that measures concentrations of neurometabolites in vivo by detecting hydrogen nuclei resonance.
N-acetyl aspartate (NAA): A marker of neuronal health and metabolic activity, often reduced in regions of neuronal loss or dysfunction.
Glx: The combined signal of glutamate and glutamine, reflecting excitatory neurotransmitter cycling and glial metabolism.
Glutamate (Glu): The principal excitatory neurotransmitter in the brain, central to synaptic transmission and plasticity.
Glutamine (Gln): A precursor and reservoir for glutamate synthesis, predominantly produced by astrocytes in the glutamate–glutamine cycle.
Gamma-aminobutyric acid (GABA): The primary inhibitory neurotransmitter, involved in modulating cortical excitability and mood regulation.
Creatine (Cr): Involved in cellular energy metabolism and commonly used as an internal normalisation reference in spectroscopic analyses.
References
- Changes in the medial prefrontal cortex metabolites after 6 months of medication therapy for patients with bipolar disorder: A 1H‐MRS study. CNS Neuroscience & Therapeutics (2024).
- Proton magnetic resonance spectroscopy of N-acetyl aspartate in first depressive episode and chronic major depressive disorder: A systematic review and meta-analysis. Journal of Affective Disorders (2024).
- Neurometabolite changes in response to antidepressant medication: A systematic review of 1H-MRS findings. NeuroImage Clinical (2023).
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