Abstract
The measurement of brain metabolites with magnetic resonance spectroscopy (MRS) provides a unique perspective on the brain bases of neuropsychiatric disorders. As a context for interpreting MRS studies of neuropsychiatric disorders, we review the characteristic MRS signals, the metabolic dynamics, and the neurobiological significance of the major brain metabolites that can be measured using clinical MRS systems. These metabolites include N-acetylaspartate (NAA), creatine, choline-containing compounds, myo-inositol, glutamate and glutamine, lactate, and gamma-amino butyric acid (GABA). For the major adult neuropsychiatric disorders (schizophrenia, bipolar disorder, major depression, and the anxiety disorders), we highlight the most consistent MRS findings, with an emphasis on those with potential clinical or translational significance. Reduced NAA in specific brain regions in schizophrenia, bipolar disorder, post-traumatic stress disorder, and obsessive–compulsive disorder corroborate findings of reduced brain volumes in the same regions. Future MRS studies may help determine the extent to which the neuronal dysfunction suggested by these findings is reversible in these disorders. Elevated glutamate and glutamine (Glx) in patients with bipolar disorder and reduced Glx in patients with unipolar major depression support models of increased and decreased glutamatergic function, respectively, in those conditions. Reduced phosphomonoesters and intracellular pH in bipolar disorder and elevated dynamic lactate responses in panic disorder are consistent with metabolic models of pathogenesis in those disorders. Preliminary findings of an increased glutamine/glutamate ratio and decreased GABA in patients with schizophrenia are consistent with a model of NMDA hypofunction in that disorder. As MRS methods continue to improve, future studies may further advance our understanding of the natural history of psychiatric illnesses, improve our ability to test translational models of pathogenesis, clarify therapeutic mechanisms of action, and allow clinical monitoring of the effects of interventions on brain metabolic markers.
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Abbreviations
- 1H-MRS:
-
Proton magnetic resonance spectroscopy
- 2D:
-
Two dimensional
- 31P-MRS:
-
Phosphorous magnetic resonance spectroscopy
- ADP:
-
Adenosine diphosphate
- AGAT:
-
Arginine-glycine aminotransferase
- ASICs:
-
Acid sensing ion channels
- ASPA:
-
Aspartoacylase
- Asp-NAT:
-
Aspartate N-acetyltransferase
- ATP:
-
Adenosine triphosphate
- CK:
-
Creatine kinase
- CNS:
-
Central nervous system
- CO2:
-
Carbon dioxide
- CSF:
-
Cerebrospinal fluid
- CSI:
-
Chemical shift imaging
- EAAT1:
-
Excitatory amino acid transporter 1
- EAAT2:
-
Excitatory amino acid transporter 2
- ECF:
-
Extracellular fluid
- EEG:
-
Electroencephalogram
- GAA:
-
Guanidinoacetate
- GABA:
-
Gamma aminobutyric acid
- GABA-T:
-
Gamma aminobutyric acid transaminase
- GAD:
-
Glutamic acid decarboxylase
- GAD65:
-
65 kilodalton form of GAD
- GAD67:
-
67 kilodalton form of GAD
- GAMT:
-
Guanidinoacetate methyltransferase
- GAT:
-
GABA transporter
- Glx:
-
The combined signal from glutamate and glutamine
- GPCho:
-
Glycerophosphorylcholine
- H+:
-
Hydrogen ions
- Hz:
-
Hertz, or cycles per second
- Km:
-
Michaelis-Menten constant
- MCT:
-
Monocarboxylate transporter
- MEGA:
-
Mescher-Garwood
- mM:
-
Millimoles
- MR:
-
Magnetic resonance
- MRI:
-
Magnetic resonance imaging
- mRNA:
-
Messenger ribonucleic acid
- MRS:
-
Magnetic resonance spectroscopy
- MRSI:
-
Magnetic resonance spectroscopic imaging
- MRUI:
-
Magnetic Resonance User Interface
- ms:
-
Milliseconds
- NAA:
-
N-acetylaspartate
- NAAG:
-
N-acetylaspartylglutamate
- NMDA:
-
N-methyl-D-aspartic acid
- OCD:
-
Obsessive compulsive disorder
- PCho:
-
Phosphorylcholine
- PEPSI:
-
Proton echoplanar spectroscopic imaging
- pH:
-
Negative logarithm of hydrogen ion concentration
- PMEs:
-
Phosphomonoesters
- ppm:
-
Parts per million
- PRESS:
-
Point resolved spectroscopic sequence
- PTSD:
-
Post traumatic stress disorder
- SSRI:
-
Selective serotonin reuptake inhibitor
- TCA:
-
Tricarboxylic acid
- TE:
-
Echo time
- VGluT:
-
Vesicular glutamate transporter
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Maddock, R.J., Buonocore, M.H. (2011). MR Spectroscopic Studies of the Brain in Psychiatric Disorders. In: Carter, C., Dalley, J. (eds) Brain Imaging in Behavioral Neuroscience. Current Topics in Behavioral Neurosciences, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/7854_2011_197
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