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Evaluation of the Influence of the Conjugation Site of the Chelator Agent HYNIC to GLP1 Antagonist Radiotracer for Insulinoma Diagnosis.
BACKGROUND AND OBJECTIVE: Radiotracer diagnosis of insulinoma, can be done using somatostatin or glucagon-like peptide 1 (GLP-1). Performance of GLP-1 antagonists tends to be better than of agonists.
METHODS: We investigated the uptake of the antagonist exendin (9-39), radiolabeled with technetium- 99m. Two different sites of the biomolecule were selected for chelator attachment.
RESULTS: HYNIC-βAla chelator attached to serine (C- terminus) of exendin, was associated with higher tumor uptake than to aspartate (N- terminus).
CONCLUSION: The chelator position in the biomolecule influenced receptor uptake.
METHODS: We investigated the uptake of the antagonist exendin (9-39), radiolabeled with technetium- 99m. Two different sites of the biomolecule were selected for chelator attachment.
RESULTS: HYNIC-βAla chelator attached to serine (C- terminus) of exendin, was associated with higher tumor uptake than to aspartate (N- terminus).
CONCLUSION: The chelator position in the biomolecule influenced receptor uptake.
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