Synthesis and pharmacological characterization in vitro of cyclic enkephalin analogs: effect of conformational constraints on opiate receptor selectivity
作者:John DiMaio、Thi M. D. Nguyen、Carole Lemieux、Peter W. Schiller
DOI:10.1021/jm00354a008
日期:1982.12
[D-Leu5] and [des-Leu5] analogues of 4 (5 and 6) showed, in general, high potency in the guinea pig ileum (GPI) assay and low potency in the mouse vas deferens (MVD) assay. IC50 (MVD)/IC50 (GPI) ratios ranging from 3.1 to 29.4 were obtained, indicating the preference of the cyclic analogues for mu receptors over delta receptors. With two exceptions, preferential affinity for mu receptors is reflected in the
使用固相和溶液方法的组合,我们通过取代脑啡肽序列2位上的D-α,ω-二氨基酸和将ω-氨基环化成环,合成了一系列环状[Leu5]脑啡肽类似物。亮氨酸的C末端羧基。在位置2和[D-Leu5]上包含D-alpha,β-二氨基丙酸(1),D-alpha,γ-二氨基丁酸(2),D-鸟氨酸(3)或D-赖氨酸(4)的环状类似物]和[des-Leu5] 4的类似物(5和6)通常在豚鼠回肠(GPI)分析中显示出高效,而在小鼠输精管(MVD)分析中显示出低效。获得的IC50(MVD)/ IC50(GPI)比率范围为3.1至29.4,表明mu受体比delta受体更喜欢环状类似物。除了两个例外,对mu受体的优先亲和力反映在分别使用[3H]纳洛酮和[3H] [D-Ala2,D-Leu5]脑啡肽作为mu和delta受体选择性放射性配体的平行结合测定中确定的Ki比中。环状类似物1-4与相应的开环类似物[D-Ala2,L