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Imaging neuroreceptors in living human brain. Masaomi IYO 1 , Toshiro YAMASAKI 2 1Division of Drug Dependence and Psychotropic Drug Clinical Research, National Institute of Mental Health, National Center of Neurology and Psychiatry 2Division of Clinical Research, Natipnal Institute of Radiological Sciences pp.432-442
Published Date 1993/6/10
DOI https://doi.org/10.11477/mf.1431900339

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  • Abstract
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It has been 10 years since the first image of receptors in the living human brain by PET was reported. A lot of radioligands for several kinds of neuroreceptors, such as dopamine receptors, serotonin receptors, opiate receptors, benzodiazepine receptors etc., have been developed and applied for human study. Some quantitative approaches have been considered, which allows us to analyze receptor images quantitatively, i.e., obtain Bmax and Kd, and to find age-related decrease in several receptors and neurochemical abnormalities in diseased brains in vivo. A decrease in benzodiazepine receptors and an increase in mu opiate receptors in epileptic focus have been revealed. The behavior of striatal dopamine D1 and D2 receptors has been suggested to be different in early Parkinson's disease. As to dopamine D2 receptors in drug naive schizophrenia, two groups reported inconsistent results. One showed an increase in schizophrenia, and the other showed no change compared to control subjects. This difference may result from the characteristics of different radioligands and analytic methods between the two groups, which indicates that there may be still methodological problems in receptor measurement by PET. However, estimations of receptor occupancy of neuroleptics have been possible and are contributing new ideas for clinical treatment of mental disorders.


Copyright © 1993, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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