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Wurzer, Alexander; Seidl, Christof; Morgenstern, Alfred; Bruchertseifer, Frank; Schwaiger, Markus; Wester, Hans‐Jürgen; Notni, Johannes
Chemistry : a European journal, January 12, 2018, Letnik: 24, Številka: 3Journal Article
Improvement of the accuracy of dosimetry in radionuclide therapy has the potential to increase patient safety and therapeutic outcomes. Although positron emission tomography (PET) is ideally suited for acquisition of dosimetric data because PET is inherently quantitative and offers high sensitivity and spatial resolution, it is not directly applicable for this purpose because common therapeutic radionuclides lack the necessary positron emission. This work reports on the synthesis of dual‐nuclide labeled radiopharmaceuticals with therapeutic and PET functionality, which are based on common and widely available metal radionuclides. Dual‐chelator conjugates, featuring interlinked cyclen‐ and triazacyclononane‐based polyphosphinates DOTPI and TRAP, allow for strictly regioselective complexation of therapeutic (e.g., 177Lu, 90Y, or 213Bi) and PET (e.g., 68Ga) radiometals in the same molecular framework by exploiting the orthogonal metal ion selectivity of these chelators (DOTPI: large cations, such as lanthanide(III) ions; TRAP: small trivalent ions, such as GaIII). Such DOTPI–TRAP conjugates were decorated with 3 Gly‐urea‐Lys (KuE) motifs for targeting prostate‐specific membrane antigen (PSMA), employing Cu‐catalyzed (CuAAC) as well as strain‐promoted (SPAAC) click chemistry. These were labeled with 177Lu or 213Bi and 68Ga and used for in vivo imaging of LNCaP (human prostate carcinoma) tumor xenografts in SCID mice by PET, thus proving practical applicability of the concept. Take two: Dual‐nuclide labeled radiopharmaceuticals with therapeutic and PET functionality, derived from common and widely available metal radionuclides, enable a precise PET‐based dosimetry for improvement of individual therapeutic outcome and increased patient safety in molecular radiotherapy.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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