Synthesis and analgesic properties of two leucine-enkephalin analogs containing a conformationally restrained N-terminal tyrosine residue
作者:Trevor Deeks、Peter A. Crooks、Roger D. Waigh
DOI:10.1021/jm00359a024
日期:1983.5
Two analogues of Leu-enkephalin, in which the terminal tyrosine-1 residue has been replaced by a conformationally restrained tyrosine analogue, have been synthesized by classical solution methods, and their opiate agonist potencies on electrically stimulated guinea pig ileum and mouse vas deferens preparations were determined in comparison with Leu-enkephalin. The restriction in the degree of freedom
通过经典溶液法合成了亮氨酸脑啡肽的两个类似物,其中末端酪氨酸-1残基已被构象受限的酪氨酸类似物取代,它们在电刺激的豚鼠回肠和小鼠输精管上的鸦片激动剂效力为与亮氨酸脑啡肽相比测定。[(2-氨基-6-羟基-2-四氢萘基)羰基]甘氨酰甘氨酰苯丙氨酰亮氨酸甲酯(3e)中酪氨酸部分自由度的限制导致在mu受体亚型的激动剂活性高7至8倍与亮氨酸脑啡肽相比,豚鼠回肠中的浓度降低了30倍左右。在上述测试中,[(2-氨基-5-羟基-2-茚满基)羰基]-甘氨酰甘氨酰苯丙氨酰亮氨酸甲酯(2e)没有活性。这些结果证明了限制构象柔韧性对受体识别的不同作用。当在sc和icv给药后通过热板试验在小鼠中评估时,两种类似物均不具有任何镇痛特性。