Renal localization of high radioactivity levels during targeted imaging compromises tissue visualization in the kidney region and limits diagnostic accuracy. Radioiodinated antibody fragments with a renal enzyme-cleavable N(ε)-maleoyl-L-lysyl-glycine (MAL) linkage demonstrated low renal radioactivity levels in mice, from early postinjection times. This study tested the hypothesis whether a (64)Cu-labeled NODAGA-exendin-4 peptide with a MAL linkage ([(64)Cu]NODAGA-MAL-exendin-4) could decrease kidney radioactivity levels in rats, compared to a [(64)Cu]NODAGA-exendin-4 reference, without impairing the radioactivity levels in the target tissue.
Renal localization of high radioactivity levels during targeted imaging compromises tissue visualization in the kidney region and limits diagnostic accuracy. Radioiodinated antibody fragments with a renal enzyme-cleavable N(ε)-maleoyl-L-lysyl-glycine (MAL) linkage demonstrated low renal radioactivity levels in mice, from early postinjection times. This study tested the hypothesis whether a (64)Cu-labeled NODAGA-exendin-4 peptide with a MAL linkage ([(64)Cu]NODAGA-MAL-exendin-4) could decrease kidney radioactivity levels in rats, compared to a [(64)Cu]NODAGA-exendin-4 reference, without impairing the radioactivity levels in the target tissue.