Tetrazine-<i>trans</i>-cyclooctene ligated lanthanide conjugates for biomedical imaging.

ABSTRACT: Lanthanide chelates and copper-free 'click' chemistry have important uses for targeted molecular imaging and therapeutic strategies. Herein, we report the complexation of lanthanides to a tetrazine-functionalised DO3A macrocyclic chelator and the tetrazine-TCO ligation between the lanthanide(DO3A-tetrazine) complexes and a TCO-PEG₄-functionalised rhodamine as a model agent. The luminescent and magnetic properties of the resultant dual-modal conjugates are described. The tetrazine moiety was found to sensitise terbium luminescence, resulting in a 'turn-off' effect upon its transformation to the dihydropyridazine linker, with the rhodamine moiety then dominating the fluorescence emissions. The T ₁ relaxivities of Gd(DO3A-tetrazine) and Gd(DO3A-PEG₄-rho

SUBMITTER: Chen H 

PROVIDER: S-EPMC12542886 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature