Abstract
Rationale
Schizotypal personality disorder (SPD) is associated with working memory (WM) impairments that are similar to those observed in schizophrenia. Imaging studies have suggested that schizophrenia is associated with alterations in dopamine D1 receptor availability in the prefrontal cortex (PFC) that may be related to the WM impairments that characterize this disorder.
Objectives
The aim of this study was to characterize prefrontal D1 receptor availability and its relation to WM performance in SPD.
Methods
We used positron emission tomography (PET) and the radiotracer [11C]NNC112 with 18 unmedicated SPD and 21 healthy control participants; as an index of D1 receptor availability, binding potential (BP) measures (BPF, BPND, and BPP) were calculated for prefrontal and striatal subregions. To assess WM, SPD participants completed the 2-back and Paced Auditory Serial Addition Test (PASAT).
Results
There were no significant group differences in PFC BP. BPF and BPP in the medial PFC were significantly negatively related to PASAT performance (r s = −0.551, p = .022 and r s = −0.488, p = .047, respectively), but BP was not related to 2-back performance.
Conclusions
In contrast to what has been found in schizophrenia, SPD was not associated with significant alterations in prefrontal D1 receptor availability. Similar to previous schizophrenia findings, however, higher prefrontal D1 receptor availability was associated with poorer WM performance (as measured by the PASAT) in SPD. These findings suggest that schizophrenia and SPD may share a common pathophysiological feature related to prefrontal dopamine functioning that contributes to WM dysfunction, but that in SPD, alterations in D1 may occur only in a subset of individuals and/or to an extent that is minor relative to what occurs in schizophrenia.
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Acknowledgments
We thank the research participants of this study and express gratitude for the expert assistance of Rawad Ayoub, Jennifer Bae, Felipe Castillo, John Castrillon, Elizabeth Hackett, Elisabeth Iskander, Olga Kambalov, and Ethan Rothstein. This work was supported by a Merit Review grant (7609-028) from the US Department of Veterans Affairs to Larry J. Siever, by grant MH56140 from the National Institute of Mental Health to Larry J. Siever, and by the Veterans Affairs VISN 3 Mental Illness Research, Education and Clinical Center (MIRECC).
Conflict of interest
The authors declare no conflicts of interest; however, the following coauthors have appointments at the James J. Peters Veterans Affairs Medical Center, Bronx, NY (in addition to the Mount Sinai School of Medicine, New York, NY): Daniel R. Rosell, Yosefa Ehrlich, Erin A. Hazlett, and Larry J. Siever. In addition, some coauthors have financial relationships with pharmaceutical companies. Specifically, Mark Slifstein serves as a consultant for Amgen and receives research support from Pierre Fabre; Ragy R. Girgis receives research support from Otsuka; Lawrence S. Kegeles receives research support from Pfizer and Amgen; and Anissa Abi-Dargham is a consultant for Amgen and Roche, and receives research support from Otsuka, Takeda, Forest, and Pierre Fabre.
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Thompson, J.L., Rosell, D.R., Slifstein, M. et al. Prefrontal dopamine D1 receptors and working memory in schizotypal personality disorder: a PET study with [11C]NNC112. Psychopharmacology 231, 4231–4240 (2014). https://doi.org/10.1007/s00213-014-3566-6
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DOI: https://doi.org/10.1007/s00213-014-3566-6