1. In Vivo Tissue Pharmacokinetics of Carbon-11-Labeled Clozapine in Healthy Volunteers: A Positron Emission Tomography Study.
- Author
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Park, HS, Kim, E, Moon, BS, Lim, NH, Lee, BC, and Kim, SE
- Subjects
TISSUES ,PHARMACOKINETICS ,CARBON ,CLOZAPINE ,POSITRON emission tomography - Abstract
We investigated clozapine (CLZ) tissue pharmacokinetics in vivo by using carbon-11-labeled CLZ (
11 C-CLZ) and positron emission tomography (PET). Eight healthy volunteers underwent11 C-CLZ studies wherein computed tomography image acquisition was followed by PET scans (whole-body, four; brain, four). After bolus intravenous11 C-CLZ injection, PET images were acquired at various timepoints for 2-3 hours. Tissue11 C-CLZ signals were plotted over time, and pharmacokinetic parameters were determined. High11 C-CLZ radioactivity was detected in the liver and brain, implying CLZ hepatic metabolism and efficient blood-brain barrier penetration. The urinary and hepatobiliary tracts were involved in11 C-CLZ excretion. Moderate to high radioactivity was observed in the dopaminergic and serotonergic receptor-rich brain regions, indicating CLZ binding to multiple receptor types. To our knowledge, this is the first study to report the determination of11 C-CLZ tissue pharmacokinetics in humans. PET using radiolabeled drugs can provide valuable information that could complement plasma pharmacokinetic data. [ABSTRACT FROM AUTHOR]- Published
- 2015
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