JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
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Fronto-striatal glutamatergic compounds in compulsive and impulsive syndromes: a review of magnetic resonance spectroscopy studies.

Compulsivity and impulsivity are cross-disorder traits observed in autism spectrum disorders (ASD), attention deficit hyperactivity disorder (ADHD) and obsessive compulsive disorder (OCD). Aberrant fronto-striatal glutamatergic signalling is core to the understanding of compulsive and impulsive disorders. In this review, the glutamate (Glu) neurochemistry of fronto-striatal circuits in paediatric and adult ASD, ADHD and OCD, as described in 59 studies, is outlined from the perspective of proton magnetic resonance spectroscopy ((1)H MRS). Despite the methodological inconsistencies between studies, two observations stand out that form possible hypotheses for future studies. Firstly, a possible increase in Glx (combination of Glu, glutamine and GABA) in the striatum across ADHD, OCD and ASD. Secondly, an increased Glx signal in the anterior cingulate cortex in paediatric ASD and ADHD but a lower Glx signal in adult ASD and ADHD. This suggests neurodevelopmental changes in fronto-striatal glutamatergic circuits across the lifespan. Future studies should incorporate more homogeneous samples, perform MRS at field strengths of at least 3 Tesla and provide much more precise and standardized information on methods to improve our understanding of fronto-striatal glutamatergic transmission in compulsive and impulsive syndromes.

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