Abstract
Several studies suggest that dysregulation of dopaminergic transmission in the midbrain and thalamus may contribute to the symptomatology of schizophrenia. The objective of this study was to examine the putative alteration of dopamine D2/3 receptor densities in the thalamus and midbrain of drug-naïve schizophrenic patients. We used the high-affinity single-photon emission tomography ligand [123I]epidepride for imaging D2/3 receptor binding sites in six neuroleptic-naïve schizophrenic patients, and seven healthy controls. Schizophrenic symptoms were evaluated by the Positive and Negative Syndrome Scale. Significantly lower D2/3 values were observed in the midbrain of patients with schizophrenia compared to controls (P = 0.02). No statistically significant difference was observed in the thalamus between two groups. Negative correlations were found between thalamic D2/3 receptor binding and general psychopathological schizophrenic symptoms (r from −0.78 to −0.92). These observations implicate altered dopaminergic activity in the midbrain of schizophrenic patients.
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Acknowledgements
This study was supported by the Research Council for Health of the Finnish Academy, an EVO grant from the Kuopio University Hospital, Annual EVO Financing from Niuvanniemi Hospital, and the Maire Taponen Foundation.
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Tuppurainen, H., Kuikka, J.T., Laakso, M.P. et al. Midbrain dopamine D2/3 receptor binding in schizophrenia. Eur Arch Psychiatry Clin Neurosci 256, 382–387 (2006). https://doi.org/10.1007/s00406-006-0649-3
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DOI: https://doi.org/10.1007/s00406-006-0649-3