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Convenient Preparation of 68Ga-Based PET-Radiopharmaceuticals at Room Temperature

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    Convenient Preparation of 68Ga-Based PET-Radiopharmaceuticals at Room Temperature
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    Uppsala Applied Science Lab, GEMS PET Systems AB, GE Healthcare, SE-752 29 Uppsala, Sweden, Division of Radiological Chemistry, University Hospital, CH-4031 Basel, Switzerland, and Department of Biochemistry and Organic Chemistry, BMC, Uppsala University, SE-75124 Uppsala, Sweden
    * Address for correspondence: Irina Velikyan, Uppsala Applied Science Lab, GEMS PET Systems AB, GE Healthcare, Husbyborg, SE-75229 Uppsala, Sweden, Phone: +46 18 180917 , Fax: +46 18 180912, E-mail: [email protected]
    †GE Healthcare.
    ‡University Hospital.
    §Uppsala University.
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    Bioconjugate Chemistry

    Cite this: Bioconjugate Chem. 2008, 19, 2, 569–573
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    https://doi.org/10.1021/bc700341x
    Published January 19, 2008
    Copyright © 2008 American Chemical Society
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    Abstract

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    A straightforward labeling using generator produced positron emitting 68Ga, which provides high quality images, may result in kit type production of PET radiopharmaceuticals and make PET examinations possible also at centers lacking accelerators. The introduction of macrocyclic bifunctional chelators that would provide fast 68Ga-complexation at room temperature would simplify even further tracer preparation and open wide possibilities for 68Ga-labeling of fragile and potent macromolecules. Gallium-68 has the potential to facilitate development of clinically practical PET and to promote PET technique for individualized medicine. The macrocyclic chelator, 1,4,7-triazacyclononanetriacetic acid (NOTA), and its derivative coupled to an eight amino acid residue peptide (NODAGA-TATE, [NODAGA0, Tyr3]Octreotate) were labeled with 68Ge/68Ga-generator produced positron emitting 68Ga. Formation kinetics of 68Ga-NOTA was studied as a function of pH and formation kinetics of 68Ga-NODAGA-TATE was studied as a function of the bioconjugate concentration. The nearly quantitative radioactivity incorporation (RAI > 95%) for 68Ga-NOTA was achieved within less than 10 min at room temperature and pH 3.5. The concentrations of NODAGA-TATE required for RAI of >90% and >95% were, respectively, 2–5 and 10 µM. In both cases the purification of the 68Ga-labeled products was not necessary since the radiochemical purity was >95% and the preparation buffer, 4-(2-hydroxyethyl) piperazine-1-ethanesulfonic acid (HEPES) is suitable for human use. In order to confirm the identity of the products, complexes comprising natGa were synthesized and analyzed by mass spectrometry. The complex was found to be stable in the reaction mixture, phosphate buffer, and human plasma during 4.5 h incubation. Free and peptide conjugated NOTA formed stable complexes with 68Ga at room temperature within 10 min. This might be of special interest for the labeling of fragile and potent macromolecules and allow for kit type preparation of 68Ga-based radiopharmaceuticals.

    Copyright © 2008 American Chemical Society

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    Cite this: Bioconjugate Chem. 2008, 19, 2, 569–573
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