Ring substituted and other conformationally constrained tyrosine analogs of [cyclic] [D-Pen2,D-Pen5]enkephalin with .delta.-opioid receptor selectivity
作者:Geza Toth、K. C. Russell、Geoffrey Landis、Thomas H. Kramer、Lei Fang、Richard Knapp、Peg Davis、Thomas F. Burks、Henry I. Yamamura、Victor J. Hruby
DOI:10.1021/jm00091a006
日期:1992.6
opioid receptor selectivity. Of the beta-methyl-substituted Tyr1 analogues, [(2S,3R)-beta-MeTyr1]DPDPE was the most potent and the delta receptor selective. The results with substitution of beta-MeTyr or Hat instead of Tyr also demonstrate that topographical modification in a conformationally restricted ligand can significantly modulate both potency and receptor selectivity of peptide ligands that have
构象受限的含环状二硫键的δ阿片受体选择性脑啡肽类似物[D-Pen2,D-Pen5]脑啡肽(DPDPE)通过2'(CH3)和3'(I,OCH3,NO2,NH2)环取代和被β-甲基构象约束的β-甲基酪氨酸衍生物置于1位。这些类似物的效价和选择性通过在小鼠输精管上的生物测定(MVD,δ受体测定)和豚鼠回肠(GPI,mu受体测定)测定,以及在大鼠脑中使用[3H] CTOP( μ配体)和[3H] [p-ClPhe4] DPDPE(δ配体)。类似物在结合测定和生物测定中显示出高度可变的效力。Hammett常数为正的芳香环取代基的效能降低,而具有负Hammett约束的取代基则增加了阿片受体的效价。基于结合的最有效和最具选择性的化合物是[2'-MeTyr1] DPDPE(结合分析中IC50 = 0.89 nM,选择性比为1310)。含6-羟基-2-氨基四氢-2-羧酸的类似物[Hat1] DPDPE在两种测