Feasibility of a Scale-down Production of [68Ga]Ga-NODAGA-Exendin-4 in a Hospital Based Radiopharmacy

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Author(s): Silvia Migliari*, Antonino Sammartano, Maura Scarlattei, Giorgio Baldari, Barbara Janota, Riccardo C. Bonadonna, Livia Ruffini

Journal Name: Current Radiopharmaceuticals

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Background: Glucagon-like peptide 1 receptor (GLP-1R) is preferentially expressed in β-cells, but it is highly expressed in human insulinomas and gastrinomas. Several GLP-1 receptor–avid radioligands have been developed to image insulin-secreting tumors or to provide a quantitative in vivo biomarker of pancreatic β-cell mass. Exendin-4 is a high affinity ligand of the GLP1-R, which is a candidate for being labeled with a PET isotope and used for imaging purposes.

Objective: Here, we report the development and validation results of a semi manual procedure to label [Lys40,Nle14(Ahx-NODAGA)NH2]exendin-4, with Ga-68.

Methods: A 68Ge/68Ga Generator (GalliaPharma®,Eckert and Ziegler) was eluted with 0.1M HCl on an automated synthesis module (Scintomics GRP®). The peptide contained in the kit vial (Radioisotope Center POLATOM) in different amounts (10-20-30 µg) was reconstituted with 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethansulfonic acid (HEPES) solution and 68GaCl3 (400–900 MBq), followed by 10 min incubation at 95°C. The reaction solution was then purified through an Oasis HLB column. The radiopharmaceutical product was tested for quality controls (CQs), in accordance with the European Pharmacopoeia standards.

Results: The synthesis of 68Ga]Ga-NODAGA-Exendin-4 provided optimal results with 10 µg of peptide, getting the best radiochemical yield (23.53 ± 2.4 %), molar activity (100 GBq/µmol) and radiochemical purity (91.69 %).

Conclusion: The study developed an imaging tool [68Ga]Ga-NODAGA-Exendin-4, avoiding pharmacological effects of exendin-4, for the clinical community.

Keywords: [68Ga]Ga-NODAGA-Exendin-4, PET imaging, pancreatic beta cells, insulinoma, type 2 diabetes, GLP-1 receptor

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Article Details

Published on: 09 March, 2021
(E-pub Ahead of Print)
DOI: 10.2174/1874471014666210309151930
Price: $95

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