Preclinical Properties of 18F-AV-45: A PET Agent for Aβ Plaques in the Brain
Autor: | Nathaniel Lim, Seok Rye Choi, Franz Hefti, Tyler E. Benedum, Michael R. Kilbourn, Geoff Golding, Daniel Skovronsky, Hank F. Kung, Zhi-Ping Zhuang, Wei Zhang |
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Rok vydání: | 2009 |
Předmět: |
Male
Genetically modified mouse Biodistribution Pathology medicine.medical_specialty Transgene Mice Transgenic Article Pathogenesis Mice Alzheimer Disease medicine Animals Humans Tissue Distribution Radiology Nuclear Medicine and imaging Amyloid beta-Peptides Aniline Compounds Chemistry Brain Benzene Haplorhini Human brain medicine.disease In vitro medicine.anatomical_structure Positron-Emission Tomography Injections Intravenous Autoradiography Ethylene Glycols Female Alzheimer's disease Ex vivo |
Zdroj: | Journal of Nuclear Medicine. 50:1887-1894 |
ISSN: | 2159-662X 0161-5505 |
DOI: | 10.2967/jnumed.109.065284 |
Popis: | beta-amyloid plaques (Abeta plaques) in the brain, containing predominantly fibrillary Abeta peptide aggregates, represent a defining pathologic feature of Alzheimer disease (AD). Imaging agents targeting the Abeta plaques in the living human brain are potentially valuable as biomarkers of pathogenesis processes in AD. (E)-4-(2-(6-(2-(2-(2-(18)F-fluoroethoxy)ethoxy)ethoxy)pyridin-3-yl)vinyl)-N-methyl benzenamine ((18)F-AV-45) is such as an agent currently in phase III clinical studies for PET of Abeta plaques in the brain.In vitro binding of (18)F-AV-45 to Abeta plaques in the postmortem AD brain tissue was evaluated by in vitro binding assay and autoradiography. In vivo biodistribution of (18)F-AV-45 in mice and ex vivo autoradiography of AD transgenic mice (APPswe/PSEN1) with Abeta aggregates in the brain were performed. Small-animal PET of a monkey brain after an intravenous injection of (18)F-AV-45 was evaluated.(18)F-AV-45 displayed a high binding affinity and specificity to Abeta plaques (K(d), 3.72 +/- 0.30 nM). In vitro autoradiography of postmortem human brain sections showed substantial plaque labeling in AD brains and not in the control brains. Initial high brain uptake and rapid washout from the brain of healthy mice and monkey were observed. Metabolites produced in the blood of healthy mice after an intravenous injection were identified. (18)F-AV-45 displayed excellent binding affinity to Abeta plaques in the AD brain by ex vivo autoradiography in transgenic AD model mice. The results lend support that (18)F-AV-45 may be a useful PET agent for detecting Abeta plaques in the living human brain. |
Databáze: | OpenAIRE |
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