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Scientific result | Positron Emission Tomography | Chemistry
A new PET imaging method by antibody pretargeting was developed at SHFJ, in collaboration with teams of SCBM and SPI. It consists in reacting in vivo a molecule labeled with 18Fluor with an antibody previously fixed on a tumor and this, in an extremely fast and selective manner, thanks to a « click-chemistry » reaction. The very good results obtained allow to consider the use of pre-targeted antibodies in nuclear medicine.
We report the first pretargeting in vivo study using the Strain-Promoted Sydnone–Alkyne Cycloaadition (SPSAC) reaction. The injection of a fluorine-18 labeled cyclooctyne three days after cetuximab bearing chlorosydnone moieties allowed a significant detection of the tumor by PET imaging suggesting an efficient click reaction inside the tumoral site. With a kinetic constant superior to 300 M−1 s−1, the SPSAC reaction might be an interesting tool, in addition to tetrazine-cyclooctene ligation, for in vivo chemistry.
M Richard, C Truillet, VL Tran, H Liu, K Porte, D Audisio, M Roche, B Jego, S Cholet, F Fenaille, B Kuhnast, F Taran, S Specklin. New fluorine-18 pretargeting PET imaging by bioorthogonal chlorosydnone-cycloalkyne click reaction. (2019) Chemical Communications, issue 70 http://dx.doi.org/10.1039/C9CC05486C
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.