Marta Subirà1, Marta Cano1, Stella J de Wit1, Pino Alonso1, Narcís Cardoner1, Marcelo Q Hoexter1, Jun Soo Kwon1, Takashi Nakamae1, Christine Lochner1, João R Sato1, Wi Hoon Jung1, Jin Narumoto1, Dan J Stein1, Jesus Pujol1, David Mataix-Cols1, Dick J Veltman1, José M Menchón1, Odile A van den Heuvel1, Carles Soriano-Mas1. 1. From the Psychiatry Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain (Subirà, Cano, Alonso, Cardoner, Menchón, Soriano-Mas); the Carlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Spain (Subirà, Alonso, Pujol, Menchón, Soriano-Mas); the Department of Clinical Sciences, School of Medicine, University of Barcelona, Barcelona, Spain (Subirà, Cano, Alonso, Menchón); the Department of Psychiatry, VU University Medical Center, Amsterdam, the Netherlands (De Wit, Veltman, Van den Heuvel, Schweren); the Department of Anatomy & Neurosciences, VU University Medical Center, Amsterdam, the Netherlands (De Wit, Veltman, Van den Heuvel, Remijnse); the Department and Institute of Psychiatry, University of São Paulo Medical School, São Paulo, Brazil (Hoexter, Busatto, Miguel); the Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea (Kwon, Jang, Kim, Shin); the Institute of Human Behavioral Medicine, SNU-MRC, Seoul, Korea (Kwon, Jung); the Department of Psychiatry, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan (Nakamae, Narumoto, Fukui, Nishida, Sakai); the MRC Unit on Anxiety & Stress Disorders, Department of Psychiatry, Stellenbosch University, Stellenbosch, South Africa (Lochner); Center of Mathematics, Computation and Cognition, Universidade Federal do ABC, Santo Andre, Brazil (Sato); the Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa (Stein, Fouche); the MRI Research Unit, CRC Mar, Hospital del Mar, Barcelona, Spain (Pujol); Mental Health Department, Corporació Sanitària Parc Taulí, Sabadell, Spain (Cardoner); Department of Psychiatry and Forensic Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain (Cardoner); Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM G21, Barcelona, Spain (Pujol); the Department o
Abstract
BACKGROUND: Frontostriatal and frontoamygdalar connectivity alterations in patients with obsessive-compulsive disorder (OCD) have been typically described in functional neuroimaging studies. However, structural covariance, or volumetric correlations across distant brain regions, also provides network-level information. Altered structural covariance has been described in patients with different psychiatric disorders, including OCD, but to our knowledge, alterations within frontostriatal and frontoamygdalar circuits have not been explored. METHODS: We performed a mega-analysis pooling structural MRI scans from the Obsessive-compulsive Brain Imaging Consortium and assessed whole-brain voxel-wise structural covariance of 4 striatal regions (dorsal and ventral caudate nucleus, and dorsal-caudal and ventral-rostral putamen) and 2 amygdalar nuclei (basolateral and centromedial-superficial). Images were preprocessed with the standard pipeline of voxel-based morphometry studies using Statistical Parametric Mapping software. RESULTS: Our analyses involved 329 patients with OCD and 316 healthy controls. Patients showed increased structural covariance between the left ventral-rostral putamen and the left inferior frontal gyrus/frontal operculum region. This finding had a significant interaction with age; the association held only in the subgroup of older participants. Patients with OCD also showed increased structural covariance between the right centromedial-superficial amygdala and the ventromedial prefrontal cortex. LIMITATIONS: This was a cross-sectional study. Because this is a multisite data set analysis, participant recruitment and image acquisition were performed in different centres. Most patients were taking medication, and treatment protocols differed across centres. CONCLUSION: Our results provide evidence for structural network-level alterations in patients with OCD involving 2 frontosubcortical circuits of relevance for the disorder and indicate that structural covariance contributes to fully characterizing brain alterations in patients with psychiatric disorders.
BACKGROUND: Frontostriatal and frontoamygdalar connectivity alterations in patients with obsessive-compulsive disorder (OCD) have been typically described in functional neuroimaging studies. However, structural covariance, or volumetric correlations across distant brain regions, also provides network-level information. Altered structural covariance has been described in patients with different psychiatric disorders, including OCD, but to our knowledge, alterations within frontostriatal and frontoamygdalar circuits have not been explored. METHODS: We performed a mega-analysis pooling structural MRI scans from the Obsessive-compulsive Brain Imaging Consortium and assessed whole-brain voxel-wise structural covariance of 4 striatal regions (dorsal and ventral caudate nucleus, and dorsal-caudal and ventral-rostral putamen) and 2 amygdalar nuclei (basolateral and centromedial-superficial). Images were preprocessed with the standard pipeline of voxel-based morphometry studies using Statistical Parametric Mapping software. RESULTS: Our analyses involved 329 patients with OCD and 316 healthy controls. Patients showed increased structural covariance between the left ventral-rostral putamen and the left inferior frontal gyrus/frontal operculum region. This finding had a significant interaction with age; the association held only in the subgroup of older participants. Patients with OCD also showed increased structural covariance between the right centromedial-superficial amygdala and the ventromedial prefrontal cortex. LIMITATIONS: This was a cross-sectional study. Because this is a multisite data set analysis, participant recruitment and image acquisition were performed in different centres. Most patients were taking medication, and treatment protocols differed across centres. CONCLUSION: Our results provide evidence for structural network-level alterations in patients with OCD involving 2 frontosubcortical circuits of relevance for the disorder and indicate that structural covariance contributes to fully characterizing brain alterations in patients with psychiatric disorders.
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