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- W1520005541 abstract "Since iodination of the tyrosine residue in the pressin ring of vasopressins abolishes binding to the V2 (renal) isoreceptor, the low specific activity tritiated vasopressins have been the only radioligands available for this receptor. Alternative vasopressin radioligands are described in the present study. N-tert-Butoxycarbonyl- (N-t-Boc) 125I-tyrosine or [35S]methionine were conjugated to the 8th amino acid of lysine- (LVP) or deamino-ornithine-vasopressin via active succinimidyl esters. Following the purification on C-18 reverse-phase high pressure liquid chromatography, t-Boc removal, and a second high pressure liquid chromatography purification, specific activities of 2200 and 1300 Ci/mmol were obtained for the 125I- and the 35S-labeled ligands, respectively. These vasopressin analogues, conjugated outside the pressin ring, were found to bind with high affinity to the V1A (vascular) and V2 vasopressin isoreceptors (Kd less than or equal to 10(-9) M) and to retain the full biological activity of intact vasopressin. The present study demonstrates the possibility of producing high specific activity radioligands with high affinity for the V1A and V2 vasopressin isoreceptors by conjugating labeled moieties to the 8th amino acid of vasopressin analogues. Since these new radioligands have specific activities much higher than the tritiated ligands (1300-2200 versus 10-30 Ci/mmol), they should provide considerable advantages in the future study of the physiology and biochemistry of the AVP receptors." @default.
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- W1520005541 date "1992-09-01" @default.
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- W1520005541 title "High specific activity 125I- and 35S-labeled vasopressin analogues with high affinity for the V1 and V2 vasopressin isoreceptors." @default.
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- W1520005541 doi "https://doi.org/10.1016/s0021-9258(19)36984-4" @default.
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