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We previously described a new iodinated vasopressin analogue (N epsilon-[125I]L-Tyr-[Lys8]-vasopressin) with high affinity for the vasopressin V1 and V2 isoreceptors. The aim of the present study was: i) to analyse the degradation pathway of N epsilon-[125I]L-Tyr-[Lys8]-vasopressin and (ii) to look for an effective inhibitor of radioligand degradation. N epsilon-[125I]L-Tyr-[Lys8]-vasopressin was processed in a temperature-dependent manner by crude cell membranes from LLC-PK1 cells. Only one degradation product was seen using RP-HPLC. The degradation product co-eluted with monoiodotyrosine. The stereoisomer, N epsilon-[125I]D-Tyr-[Lys8]-vasopressin, underwent the same degradation process. Bacitracin prevented degradation at doses as low as 40 mg/l without alterating the binding affinity.

Effect of Bacitracin on the Degradation of a Vasopressin Receptor Ligand with High Affinity for the V 1 and V 2 Vasopressin Isoreceptors