Quantification of human brain benzodiazepine receptors using [18F]fluoroethylflumazenil: a first report in volunteers and epileptic patients
| Autor: | Philippe Levêque, Daniel Labar, Sandra M. Sanabria-Bohórquez, Bernard Gallez, Anne Bol, K. van Rijckevorsel, Anne De Volder |
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| Rok vydání: | 2003 |
| Předmět: |
Adult
Flumazenil Male Metabolic Clearance Rate Metabolite Pilot Projects Models Biological chemistry.chemical_compound Image Processing Computer-Assisted medicine Humans Tissue Distribution Radiology Nuclear Medicine and imaging Radionuclide Imaging Receptor Epilepsy medicine.diagnostic_test Chemistry business.industry GABAA receptor Brain Binding potential General Medicine Human brain Receptors GABA-A medicine.anatomical_structure Positron emission tomography Female Radiopharmaceuticals Nuclear medicine business Preclinical imaging medicine.drug |
| Zdroj: | European Journal of Nuclear Medicine and Molecular Imaging. 30:1630-1636 |
| ISSN: | 1619-7089 1619-7070 |
| DOI: | 10.1007/s00259-003-1304-0 |
| Popis: | Fluorine-18 fluoroethylflumazenil ([18F]FEF) is a tracer for central benzodiazepine (BZ) receptors which is proposed as an alternative to carbon-11 flumazenil for in vivo imaging using positron emission tomography (PET) in humans. In this study, [18F]FEF kinetic data were acquired using a 60-min two-injection protocol on three normal subjects and two patients suffering from mesiotemporal epilepsy as demonstrated by abnormal magnetic resonance imaging and [18F]fluorodeoxyglucose positron emission tomography. First, a tracer bolus injection was performed and [18F]FEF rapidly distributed in the brain according to the known BZ receptor distribution. Thirty minutes later a displacement injection of 0.01 mg/kg of unlabelled flumazenil was performed. Activity was rapidly displaced from all BZ receptor regions demonstrating the specific binding of [18F]FEF. No displacement was observed in the pons. Plasma input function was obtained from arterial blood sampling, and metabolite analysis was performed by high-performance liquid chromatography. Metabolite quantification revealed a fast decrease in tracer plasma concentration, such that at 5 min post injection about 70% of the total radioactivity in plasma corresponded to [18F]FEF, reaching 24% at 30 min post injection. The interactions between [18F]FEF and BZ receptors were described using linear compartmental models with plasma input and reference tissue approaches. Binding potential values were in agreement with the known distribution of BZ receptors in human brain. Finally, in two patients with mesiotemporal sclerosis, reduced uptake of [18F]FEF was clearly observed in the implicated left hippocampus. |
| Databáze: | OpenAIRE |
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