β-Methyl Substitution of Cyclohexylalanine in Dmt-Tic-Cha-Phe Peptides Results in Highly Potent δ Opioid Antagonists
作者:Géza Tóth、Enikő Ioja、Csaba Tömböly、Steven Ballet、Dirk Tourwé、Antal Péter、Tamás Martinek、Nga N. Chung、Peter W. Schiller、Sándor Benyhe、Anna Borsodi
DOI:10.1021/jm060721u
日期:2007.1.1
agonist or antagonist properties depending on the configuration of the beta-MeCha residue. The most promising analog, H-Dmt-Tic-(2S,3S)-beta-MeCha-Phe-OH was a very selective delta antagonist both in the mouse vas deferens (MVD) assay (Ke = 0.241 +/- 0.05 nM) and in radioligand binding assay (K i delta = 0.48 +/- 0.05 nM, K i mu/K i delta = 2800). The epimeric peptide H-Dmt-Tic-(2S,3R)-beta-MeCha-Phe-OH
阿片肽TIPP(H-Tyr-Tic-Phe-Phe-OH,Tic:1,2,3,4-四氢异喹啉-3-羧酸)被Dmt(2',6'-二甲基酪氨酸)取代,非天然氨基酸,β-MeCha(β-甲基-环己基丙氨酸)。这种双重取代导致了一系列新的阿片样物质肽,这些蛋白显示出亚纳摩尔级δ拮抗剂活性以及μ激动剂或拮抗剂特性,这取决于β-MeCha残基的构型。在小鼠输精管(MVD)分析中,最有前途的类似物H-Dmt-Tic-(2S,3S)-β-MeCha-Phe-OH是一种非常选择性的δ拮抗剂(Ke = 0.241 +/- 0.05 nM)并且在放射性配体结合测定中(K iδ= 0.48 +/- 0.05nM,K i mu / K iδ= 2800)。差向异构肽H-Dmt-Tic-(2S,在豚鼠回肠和MVD分析中,证明3R)-β-MeCha-Phe-OH和相应的肽酰胺是混合的部分mu激动剂/δ拮抗剂。我们的结果