Abstract
Purpose
Loss of neuronal synapse function is associated with a number of brain disorders. The [11C]UCB-J positron emission tomography (PET) tracer allows for in vivo examination of synaptic density, as it binds to synaptic vesicle glycoprotein 2A (SV2A) expressed in presynaptic terminals. Here, we characterise [11C]UCB-J imaging in Göttingen minipigs.
Procedures
Using PET imaging, we examined tracer specificity and compared kinetic models. We explored the use of a standard blood curve and centrum semiovale white matter as a reference region. We compared in vivo [11C]UCB-J PET imaging to in vitro autoradiography, Western blotting and real-time quantitative polymerase chain reaction.
Results
The uptake kinetics of [11C]UCB-J could be described using a 1-tissue compartment model and blocking of SV2A availability with levetiracetam showed dose-dependent specific binding. Population-based blood curves resulted in reliable [11C]UCB-J binding estimates, while it was not possible to use centrum semiovale white matter as a non-specific reference region. Brain [11C]UCB-J PET signals correlated well with [3H]UCB-J autoradiography and SV2A protein levels.
Conclusions
[11C]UCB-J PET is a valid in vivo marker of synaptic density in the minipig brain, with binding values close to those reported for humans. Minipig models of disease could be valuable for investigating the efficacy of putative neuroprotective agents for preserving synaptic function in future non-invasive, longitudinal studies.
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Acknowledgements
We are grateful to UCB Pharma for providing precursor for initial studies. We thank the staff at the Aarhus University Hospital PET Centre, the Aarhus University Farm and Birgitte Hviid Mumm from the Translational Neuropsychiatry Unit for assistance.
Funding
This work was supported by Lundbeck Foundation, Parkinsonforeningen, Fonden af 2/7 1984 til Bekæmpelse af Parkinsonsyge and Aarhus University.
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All animal experiments were approved by the Danish Animal Experiments Inspectorate, carried out in accordance with the 2010/63/EU directive and reported using the ARRIVE guidelines.
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Thomsen, M.B., Schacht, A.C., Alstrup, A.K.O. et al. Preclinical PET Studies of [11C]UCB-J Binding in Minipig Brain. Mol Imaging Biol 22, 1290–1300 (2020). https://doi.org/10.1007/s11307-020-01506-8
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DOI: https://doi.org/10.1007/s11307-020-01506-8