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• W2418918484 abstract "A novel octadentate 3-hydroxypyridin-2-one (2,3-HOPO) based di-macrocyclic ligand was evaluated for chelation of (89)Zr; subsequently, it was used as a bi-functional chelator for preparation of (89)Zr-labeled antibodies. Quantitative chelation of (89)Zr(4+) with the octadentate ligand forming (89)ZrL complex was achieved under mild conditions within 15 minutes. The (89)Zr-complex was stable in vitro in presence of DTPA, but a slow degradation was observed in serum. In vivo, the hydrophilic (89)Zr-complex showed prevalently renal excretion; and an elevated bone uptake of radioactivity suggested a partial release of (89)Zr(4+) from the complex. The 2,3-HOPO based ligand was conjugated to the monoclonal antibodies, HER2-specific trastuzumab and an isotypic anti-gD antibody, using a p-phenylene bis-isothiocyanate linker to yield products with an average loading of less than 2 chelates per antibody. Conjugated antibodies were labeled with (89)Zr under mild conditions providing the PET tracers in 60-69% yield. Despite the limited stability in mouse serum; the PET tracers performed very well in vivo. The PET imaging in mouse model of HER2 positive ovarian carcinoma showed tumor uptake of (89)Zr-trastuzumab (29.2 ± 12.9 %ID/g) indistinguishable (p = 0.488) from the uptake of positive control (89)Zr-DFO-trastuzumab (26.1 ± 3.3 %ID/g). In conclusion, the newly developed 3-hydroxypyridin-2-one based di-macrocyclic chelator provides a viable alternative to DFO-based heterobifunctional ligands for preparation of (89)Zr-labeled monoclonal antibodies for immunoPET studies." @default.
• W2418918484 created "2016-06-24" @default.
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• W2418918484 date "2016-01-01" @default.
• W2418918484 modified "2023-10-03" @default.
• W2418918484 title "Evaluation of a 3-hydroxypyridin-2-one (2,3-HOPO) Based Macrocyclic Chelator for ⁸⁹Zr⁴⁺ and Its Use for ImmunoPET Imaging of HER2 Positive Model of Ovarian Carcinoma in Mice" @default.
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• W2418918484 doi "https://doi.org/10.7150/thno.14261" @default.
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