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Direct Aromatic 18F-Labeling of Highly Reactive Tetrazines for Pretargeted Bioorthogonal PET Imaging
preprintsubmitted on 20.02.2021, 14:34 and posted on 22.02.2021, 13:29 by Rocio Garcia-Vazquez, Umberto Maria Battisti, Jesper Tranekjær Jørgensen, Vladimir Shalgunov, Lars Hvass, Daniel L. Stares, Ida Nymann Petersen, François Crestey, Andreas Löffler, Dennis Svatunek, Jesper Langgaard Kristensen, Hannes Mikula, Andreas Kjaer, Matthias Herth
Pretargeted bioorthogonal imaging can be used to visualize and quantify slow accumulating targeting vectors with short-lived radionuclides such as fluorine-18 - the most clinically applied Positron Emission Tomography (PET) radionuclide. Pretargeting results in higher target-to-background ratios compared to conventional imaging approaches using long-lived radionuclides. Currently, the tetrazine ligation is the most popular bioorthogonal reaction for pretargeted imaging, but a direct18 F-labeling strategy for highly reactive tetrazines, which would be highly beneficial if not essential for clinical translation, has thus far not been reported. In this work, a simple, scalable and reliable direct 18 F-labeling procedure has been developed and applied to obtain a pretargeting tetrazine-based imaging agent with favorable characteristics (target-to-background ratios and clearance) that may qualify it for future clinical translation.