Influence of the Side Chain Next to C-Terminal Benzimidazole in Opioid Pseudopeptides Containing the Dmt-Tic Pharmacophore
作者:Gianfranco Balboni、Claudio Trapella、Yusuke Sasaki、Akihiro Ambo、Ewa D. Marczak、Lawrence H. Lazarus、Severo Salvadori
DOI:10.1021/jm900686q
日期:2009.9.10
To improve the structure-activity studies of the lead 6 opioid agonist H-Dmt-Tic-Asp*-Bid, we synthesized and pharmacologically characterized a series of analogues in which the side chain next to 1H-benzimidazole-2-yl (Bid) was substituted by those endowed with different chemical properties. Interesting results were obtained: (1) only Gly, Ala, and Asp resulted in delta agonism, (2) Phe yielded delta antagonism, (3) and all other residues except Glu (devoid of any activity) gave mu agonism.