Abstract
Cognitive behavioral therapy (CBT) including exposure and response prevention is a well-established treatment for obsessive–compulsive disorder (OCD) and is based on the principles of fear extinction. Fear extinction is linked to structural and functional variability in the ventromedial prefrontal cortex (vmPFC) and has been consistently associated with glutamate neurotransmission. The relationship between vmPFC glutamate and fear extinction and its effects on CBT outcome have not yet been explored in adults with OCD. We assessed glutamate levels in the vmPFC using 3T magnetic resonance spectroscopy, and fear extinction (learning and recall) using skin conductance responses during a 2-day experimental paradigm in OCD patients (n = 17) and in healthy controls (HC; n = 13). Obsessive–compulsive patients (n = 12) then received manualized CBT. Glutamate in the vmPFC was negatively associated with fear extinction recall and positively associated with CBT outcome (with higher glutamate levels predicting a better outcome) in OCD patients. Glutamate levels in the vmPFC in OCD patients were not significantly different from those in HC, and were not associated with OCD severity. Our results suggest that glutamate in the vmPFC is associated with fear extinction recall and CBT outcome in adult OCD patients.
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Acknowledgements
We thank Mohammed R. Milad, Ph.D., for providing the stimuli used in the present study and for his general advice on implementing the paradigm in our laboratory. We thank Dr. Neus Aymamí, Dr. Isabel Sánchez, and Dr. Nadine Riesgo for their help and collaboration in dispensing the CBT to the study patients. This study was funded by Instituto de Salud Carlos III (ISCIII) [PI13/01958, PI14/00413, PI16/00889, PI16/00950], FEDER funds/European Regional Development Fund (ERDF)—a way to build Europe, a PERIS award from the Ministry of Health of the Generalitat de Catalunya (SLT006/17/249), and AGAUR [2017 SGR 1247]. MC is supported by a grant from the Spanish Ministry for Education, Culture and Sport [FPU13/02141]. IM-Z is supported by a P-FIS grant [FI17/00294] and CS-M is supported by a ‘Miguel Servet’ contract [CPII16/00048] from the ISCIII.
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The study has been approved by the Institutional Review Board of University Hospital of Bellvitge and it has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki ad its later amendments. All participants gave written informed consent to participate.
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Giménez, M., Cano, M., Martínez-Zalacaín, I. et al. Is glutamate associated with fear extinction and cognitive behavior therapy outcome in OCD? A pilot study. Eur Arch Psychiatry Clin Neurosci 270, 1003–1014 (2020). https://doi.org/10.1007/s00406-019-01056-3
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DOI: https://doi.org/10.1007/s00406-019-01056-3