Multimodal investigation of dopamine D2/D3 receptors,default mode network suppression,and cognitive control in cocaine-use disorder |
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| Authors: | Patrick D Worhunsky Gustavo A Angarita Zu Wei Zhai David Matuskey Jean-Dominique Gallezot Robert T Malison Richard E Carson Marc N Potenza |
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| Institution: | 1.Department of Psychiatry, Yale School of Medicine, New Haven, CT USA ;2.Department of Psychology, Middlebury College, Middlebury, VT USA ;3.Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT USA ;4.Clinical Neuroscience Research Unit, Connecticut Mental Health Center, New Haven, CT USA ;5.Child Study Center, Yale School of Medicine, New Haven, CT USA ;6.Department of Neuroscience, Yale School of Medicine, New Haven, CT USA |
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| Abstract: | Stimulant-use disorders have been associated with lower availability of dopamine type-2 receptors (D2R) and greater availability of type-3 receptors (D3R). Links between D2R levels, cognitive performance, and suppression of the default mode network (DMN) during executive functioning have been observed in healthy and addicted populations; however, there is limited evidence regarding a potential role of elevated D3R in influencing cognitive control processes in groups with and without addictions. Sixteen individuals with cocaine-use disorder (CUD) and 16 healthy comparison (HC) participants completed 11C]-(+)-PHNO PET imaging of D2R and D3R availability and fMRI during a Stroop task of cognitive control. Independent component analysis was performed on fMRI data to assess DMN suppression during Stroop performance. In HC individuals, lower D2R-related binding in the dorsal putamen was associated with improved task performance and greater DMN suppression. By comparison, in individuals with CUD, greater D3R-related binding in the substantia nigra was associated with improved performance and greater DMN suppression. Exploratory moderated-mediation analyses indicated that DMN suppression was associated with Stroop performance indirectly through D2R in HC and D3R in CUD participants, and these indirect effects were different between groups. To our knowledge, this is the first evidence of a dissociative and potentially beneficial role of elevated D3R availability in executive functioning in cocaine-use disorder.Subject terms: Addiction, Cognitive control |
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