Abstract
Purpose
Single-stranded mirror-image oligonucleotides (Spiegelmers) are highly resistant to nuclease degradation and are capable of tightly and specifically binding to protein targets. Here we explored the potential of Spiegelmers as in vivo imaging probes for positron emission tomography (PET).
Methods
We investigated the biodistribution and pharmacokinetics of [18F]-l-DNA and [18F]-l-RNA Spiegelmers by dynamic quantitative whole-body PET imaging after intravenous administration in non-human primates. Their metabolic profile was explored in primates and rats, and ex vivo autoradiography of [125I]-l-RNA was performed in rat kidneys, the major organ for Spiegelmer uptake.
Results
Both [18F]-l-DNA and [18F]-l-RNA Spiegelmers were metabolically stable in plasma during 2 h after injection. No evidence of non-specific binding was found with either type of Spiegelmer in any tissue.
Conclusion
The biodistribution and metabolic profiles of [18F]-l-DNA and [18F]-l-RNA Spiegelmers highlight their potential as radiotracers for in vivo imaging applications.
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Acknowledgements
This study was supported in part by the OLIM program of the European Union (QLG1-2000-00562) and the European Molecular Imaging Laboratories (EMIL, LSH-2004-503569) network. We thank Thomas Rupp, Antje Müller and Jenny Kögler for the synthesis of oligonucleotides, Joann Fontyn, Vincent Brulon and Régine Trébossen from the PET instrumentation group, and Martin von Janta Lipinski, who kindly provided the deoxyuridine phosphoramidite.
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Boisgard, R., Kuhnast, B., Vonhoff, S. et al. In vivo biodistribution and pharmacokinetics of 18F-labelled Spiegelmers: a new class of oligonucleotidic radiopharmaceuticals. Eur J Nucl Med Mol Imaging 32, 470–477 (2005). https://doi.org/10.1007/s00259-004-1669-8
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DOI: https://doi.org/10.1007/s00259-004-1669-8