TY - JOUR T1 - In Vivo Imaging of the Glucagonlike Peptide 1 Receptor in the Pancreas with <sup>68</sup>Ga-Labeled DO3A-Exendin-4 JF - Journal of Nuclear Medicine JO - J Nucl Med SP - 1458 LP - 1463 DO - 10.2967/jnumed.112.114066 VL - 54 IS - 8 AU - Ram K. Selvaraju AU - Irina Velikyan AU - Lars Johansson AU - Zhanhong Wu AU - Ivan Todorov AU - Jack Shively AU - Fouad Kandeel AU - Olle Korsgren AU - Olof Eriksson Y1 - 2013/08/01 UR - http://jnm.snmjournals.org/content/54/8/1458.abstract N2 - The glucagonlike peptide 1 receptor (GLP-1R) is mainly expressed on β-cells in the islets of Langerhans and is therefore an attractive target for imaging of the β-cell mass. In the present study, 68Ga-labeled exendin-4 was evaluated for PET imaging and quantification of GLP-1R in the pancreas. Methods: Dose escalation studies of 68Ga-labeled 1,4,7-tris(carboxymethylaza)cyclododecane-10-azaacetyl (DO3A)-exendin-4 were performed in rats (organ distribution) and cynomolgus monkeys (PET/CT imaging) to determine the GLP-1R–specific tissue uptake in vivo. Pancreatic uptake (as determined by organ distribution) in healthy rats was compared with that in diabetic rats. GLP-1R occupancy in the cynomolgus pancreas was quantified with a 1-tissue-compartment model. Results: In rodents, uptake in the pancreas was decreased from the baseline by up to 90% (P &lt; 0.0001) by coadministration of DO3A-exendin-4 at 100 μg/kg. Pancreatic uptake in diabetic animals was decreased by more than 80% (P &lt; 0.001) compared with that in healthy controls, as measured by organ distribution. GLP-1R occupancy in the cynomolgus pancreas after coinjection of DO3A-exendin-4 at 0.15–20 μg/kg ranged from 49% to 97%, as estimated by compartment modeling. Conclusion: These results strongly support the notion that 68Ga-DO3A-exendin-4 uptake in the pancreas is mediated by specific receptor binding. In addition, pancreatic uptake was decreased by selective destruction of β-cells. This result suggests that GLP-1R can be quantified in vivo, which has major implications for the prospect of imaging of native β-cells. ER -