Interactions between glutamate, dopamine, and the neuronal signature of 
response inhibition in the human striatum

Lorenz, Robert C.; Gleich, Tobias; Buchert, Ralph; Schlagenhauf, Florian; Kühn, Simone; Gallinat, Jürgen

doi:10.1002/hbm.22895

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Interactions between glutamate, dopamine, and the neuronal signature of response inhibition in the human striatum

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Schlagenhauf, Florian
Department of Psychiatry and Psychotherapy, Charité University Medicine Berlin, Germany;
Max Planck Fellow Group Cognitive and Affective Control of Behavioural Adaptation, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Citation

Lorenz, R. C., Gleich, T., Buchert, R., Schlagenhauf, F., Kühn, S., & Gallinat, J. (2015). Interactions between glutamate, dopamine, and the neuronal signature of response inhibition in the human striatum. Human Brain Mapping, 36(10), 4031-4040. doi:10.1002/hbm.22895.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-6F22-C

Abstract

Response inhibition is a basic mechanism in cognitive control and dysfunctional in major psychiatric disorders. The neuronal mechanisms are in part driven by dopamine in the striatum. Animal data suggest a regulatory role of glutamate on the level of the striatum. We used a trimodal imaging procedure of the human striatum including F18-DOPA positron emission tomography, proton magnetic resonance spectroscopy, and functional magnetic resonance imaging of a stop signal task. We investigated dopamine synthesis capacity and glutamate concentration in vivo and their relation to functional properties of response inhibition. A mediation analysis revealed a significant positive association between dopamine synthesis capacity and inhibition-related neural activity in the caudate nucleus. This relationship was significantly mediated by striatal glutamate concentration. Furthermore, stop signal reaction time was inversely related to striatal activity during inhibition. The data show, for the first time in humans, an interaction between dopamine, glutamate, and the neural signature of response inhibition in the striatum. This finding stresses the importance of the dopamine–glutamate interaction for behavior and may facilitate the understanding of psychiatric disorders characterized by impaired response inhibition.