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In Vivo Imaging of the Glucagonlike Peptide 1 Receptor in the Pancreas with Ga-68-Labeled DO3A-Exendin-4
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- Selvaraju, Ram K. (author)
- Uppsala universitet,Plattformen för preklinisk PET
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- Velikyan, Irina (author)
- Uppsala universitet,Plattformen för preklinisk PET,Enheten för nuklearmedicin och PET
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- Johansson, Lars (author)
- Uppsala universitet,Enheten för radiologi
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- Wu, Zhanhong (author)
- Todorov, Ivan (author)
- Shively, Jack (author)
- Kandeel, Fouad (author)
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- (creator_code:org_t)
- 2013-06-12
- 2013
- English.
- In: Journal of Nuclear Medicine. - : Society of Nuclear Medicine. - 0161-5505 .- 1535-5667 .- 2159-662X. ; 54:8, s. 1458-1463
- Journal article (peer-reviewed)
Abstract
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- The glucagonlike peptide 1 receptor (GLP-1R) is mainly expressed on beta-cells in the Wets of Langerhans and is therefore an attractive target for imaging of the beta-cell mass. In the present study, Ga-68-labeled exendin-4 was evaluated for PET imaging and quantification of GLP-1R in the pancreas. Methods: Dose escalation studies of Ga-68-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 < 0.0001) by coadministration of DO3A-exendin-4 at 100 mu g/kg. Pancreatic uptake in diabetic animals was decreased by more than 80% (P < 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 mu g/kg ranged from 49% to 97%, as estimated by compartment modeling. Conclusion: These results strongly support the notion that Ga-68-DO3A-exendin-4 uptake in the pancreas is mediated by specific receptor binding. In addition, pancreatic uptake was decreased by selective destruction of beta-cells. This result suggests that GLP-1R can be quantified in vivo, which has major implications for the prospect of imaging of native beta-cells.
Keyword
- beta-cell imaging
- beta-cell mass
- GLP-1R
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- ref (subject category)
- art (subject category)
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- Kandeel, Fouad
- Korsgren, Olle
- Eriksson, Olof
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