The effects of N-terminal part modification of arginine vasopressin analogues with 2-aminoindane-2-carboxylic acid:: A highly potent V2 agonist

In this study we present the synthesis and some pharmacological properties of nine new analogues of arginine vasopressin modified in the N-terminal part of the molecule with 2-aminoindane-2-carboxylic acid (Aic). The peptides were tested for their in vitro uterotonic and in vivo pressor and antidiuretic activities. One of the new peptides, [Mpa(1),Aic(2),Val(4),D-Arg(8)]VP, exhibited an antidiuretic activity similar to that of [Mpa(1),D-Arg(8)]VP, thus being one of the most potent antidiuretic vasopressin analogues reported to date.