title: Efficient18F-Labeling of Synthetic Exendin-4 Analogues for Imaging Beta Cells.
abstract: A number of exendin derivatives have been developed to target glucagon-like peptide 1 (GLP-1) receptors on beta cells in vivo. Modifications of exendin analogues have been shown to have significant effects on pharmacokinetics and, as such, have been used to develop a variety of therapeutic compounds. Here, we show that an exendin-4, modified at position 12 with a cysteine conjugated to a tetrazine, can be labeled with18F-trans-cyclooctene and converted into a PET imaging agent at high yields and with good selectivity. The agent accumulates in beta cells in vivo and has sufficiently high accumulation in mouse models of insulinomas to enable in vivo imaging.
authors.affiliation: Center for Systems Biology, Massachusetts General Hospital 185 Cambridge St, CPZN 5206, Boston, MA 02114 (USA).
authors.forename: Edmund J
authors.initials: EJ
authors.lastname: Keliher
authors.forename: Thomas
authors.initials: T
authors.lastname: Reiner
authors.forename: Greg M
authors.initials: GM
authors.lastname: Thurber
authors.forename: Rabi
authors.initials: R
authors.lastname: Upadhyay
authors.forename: Ralph
authors.initials: R
authors.lastname: Weissleder
keywords: 18F-trans-cyclooctene; cancer; diabetes; exendin-4; insulinoma; positron emission tomography