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Decreases in peripheral-type benzodiazepine receptors in postmortem brains of chronic schizophrenics

  • Biological Psychiatry
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Summary

We measured the peripheral-type benzodiazepine receptors (PBRs), a marker of gliosis, in 26 brain areas (cerebral cortex, thalamus and extrapyramidal system) of the postmortem brains of 13 chronic schizophrenics and 10 controls, using [3H] PK 11195 as a ligand for the receptor assay. The specific [3H] PK 11195 binding was significantly decreased in three brain areas (superior parietal cortex, primary visual area and putamen) of schizophrenics, although there were no changes in the binding in the other brain areas. Scatchard analysis revealed that there were decreases in both the Bmax and Kd of [3H] PK 11195 binding in the brain areas. These results were almost in accordance with a number of neuropathological studies reporting that there was no change or reduction in glial cells in the brain regions of schizophrenics and suggested that the decreased density of PBRs in the brain may be involved in the pathophysiology of schizophrenia, associated with reduced production of neurosteroids coupled to PBRs.

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Author notes

  1. A. Kurumaji

    Present address: Department of Neuropsychiatry, Tokyo Medical and Dental University School of Medicine, Tokyo, Japan

  2. T. Wakai

    Present address: Life Science Institute, Sophia University, Tokyo, Japan

Authors and Affiliations

  1. Department of Neuropsychiatry, Tokyo Medical and Dental University School of Medicine, Tokyo, Japan

    T. Wakai & M. Toru

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  1. A. Kurumaji
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  2. T. Wakai
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  3. M. Toru
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Kurumaji, A., Wakai, T. & Toru, M. Decreases in peripheral-type benzodiazepine receptors in postmortem brains of chronic schizophrenics. J. Neural Transmission 104, 1361–1370 (1997). https://doi.org/10.1007/BF01294737

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  • DOI: https://doi.org/10.1007/BF01294737

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