Abstract
Purpose
The aim of this study was to compare [11C]Pittsburgh compound B ([11C]PiB) and [18F]florbetaben ([18F]FBB) for preclinical investigations of amyloid-β pathology.
Procedures
We investigated two aged animal models of cerebral amyloidosis with contrasting levels of amyloid-β relating to “high” (APPPS1-21 n = 6, wild type (WT) n = 7) and “low” (BRI1-42 n = 6, WT n = 6) target states, respectively.
Results
APPPS1-21 mice (high target state) demonstrated extensive fibrillar amyloid-β deposition that translated to significantly increased retention of [11C]PiB and [18F]FBB in comparison to their wild type. The retention pattern of [11C]PiB and [18F]FBB in this cohort displayed a significant correlation. However, the relative difference in tracer uptake between diseased and healthy mice was substantially higher for [11C]PiB than for [18F]FBB. Although immunohistochemistry confirmed the high plaque load in APPPS1-21 mice, correlation between tracer uptake and ex vivo quantification of amyloid-β was poor for both tracers. BRI1-42 mice (low target state) did not demonstrate increased tracer uptake.
Conclusions
In cases of high fibrillar amyloid-β burden, both tracers detected significant differences between diseased and healthy mice, with [11C]PiB showing a larger dynamic range.
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Acknowledgments
The authors are very thankful to Arnold Spaans from the BV Cyclotron VU (Amsterdam, The Netherlands) for providing us with the shipments of [18F]FBB and to Philippe Joye and Joke Parthoens (Molecular Imaging Center Antwerp) for technical support with in vivo experiments. The authors acknowledge the company KOESLER (Rottenburg, 613 Germany) and Dr. Mathias Jucker (University of Tubingen) for providing the APPPS1 mice. The BRI mice were obtained from Dr. Samir Kumar-Singh of the Flanders Interuniversity Institute for Biotechnology (VIB), who originally obtained them from the Mayo Foundation for Medical Education and Research. This work was funded by the Agency for Innovation by Science and Technology (IWT), by Antwerp University and Antwerp University Hospital, Belgium. Experimental resources are supported by a research contract (46/FA02006/WP130001) of Antwerp University and Janssen Pharmaceutica and by the European Union’s Seventh Framework Programme under Grant agreement no. CP-IP 212043-2 (NAD) and no. 278850 (INMiND). The funding sources had no further role in the study design or in the collection, analysis and interpretation of the data.
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The authors report no conflicts of interest.
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Waldron, AM., Verhaeghe, J., wyffels, L. et al. Preclinical Comparison of the Amyloid-β Radioligands [11C]Pittsburgh compound B and [18F]florbetaben in Aged APPPS1-21 and BRI1-42 Mouse Models of Cerebral Amyloidosis. Mol Imaging Biol 17, 688–696 (2015). https://doi.org/10.1007/s11307-015-0833-9
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DOI: https://doi.org/10.1007/s11307-015-0833-9