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- W225595722 abstract "Alterations in the central dopaminergic system have been hypothesized to underlie several neuropsychiatric disorders. Dopamine (DA) receptors in the CNS have been classified into two classes based on whether linkage to the enzyme adenylate cyclase exists, the D1 receptors, or not, D2 receptors. To date, studies on cerebral DA system by positron tomography (PET) have utilized the butyrophenones which are predominantly D2 antagonists. We have prepared Br-75 or Br-76 labelled 8-bromo analog of SCH 23390, (BrSCH), a highly selective antagonist for DA D1 receptors and have measured its distribution in the intact monkey brain by PET and by postmortem section of the mouse brain. An anesthesized 8.5 kg male rhesus monkey was given, i.v., ca. 2 mCi BrSCH on two occasions and scanned with The University of Chicago PETT VI system. Results revealed that the drug localized specifically in the basal ganglia. In a similar experiment in the same monkey given Br-76-bromospiroperidol (BrSP), a predominantly D2 antagonist, high uptake in the basal ganglia was also observed but the time course for specific localization of BrSCH was much faster than that of BrSP. These results provide evidence the D1 receptors, like D2 receptors, are localized in the caudate nucleus (CN) althoughmore » BrSCH, compared to BrSP, appear to localize more in the posterior aspect of the CN. In conclusion, BrSCH should be a useful imaging agent to study dopamine D1 receptors in the CNS.« less" @default.
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- W225595722 date "1985-05-01" @default.
- W225595722 modified "2023-09-23" @default.
- W225595722 title "Positron tomography of a radiobrominated analog of SCH 23390: A selective dopamine D1 receptor antagonist" @default.
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