Boc-CCK-4 derivatives containing side-chain ureas as potent and selective CCK-A receptor agonists
作者:Kazumi Shiosaki、Chun Wel Lin、Hana Kopecka、Michael D. Tufano、Bruce R. Bianchi、Thomas R. Miller、David G. Witte、Alex M. Nadzan
DOI:10.1021/jm00113a023
日期:1991.9
derivatives were communicated recently as having high potency and selectivity for the CCK-A receptor (Shiosaki et al. J. Med. Chem. 1990, 33, 2950-2952). While Boc-CCK-4 binds selectively to the CCK-B receptor, replacement of the methionine with an N epsilon-substituted lysine dramatically reversed receptor selectivity, leading to the development of this novel series of tetrapeptides. A detailed structure-activity
最近公开了新型Boc-CCK-4衍生物,其具有对CCK-A受体的高效力和选择性(Shiosaki等人,J.Med.Chem.1990,33,2950-2952)。当Boc-CCK-4选择性结合CCK-B受体时,用Nε取代的赖氨酸替代甲硫氨酸可显着逆转受体选择性,从而导致了这一新颖的四肽系列的发展。以一般结构Boc-Trp-Lys(N epsilon-CO-NHR)-Asp-Phe-NH2表示的一系列脲取代的四肽的详细结构活性分析显示,许多取代的苯基,萘基,赖氨酸侧链上的脂肪族脲残基产生了有效的选择性CCK-A配体。这些四肽在刺激胰淀粉酶释放中引起完全的激动剂反应,其被选择性的CCK-A受体拮抗剂有效地阻断。尿素向硫脲的转化显着降低了CCK-A结合力,用赖氨酸或同源赖氨酸替代赖氨酸也是如此。相对于CCK-8,在磷酸肌醇(PI)水解中作为部分激动剂(功效低于80%)的四肽未在豚鼠痤疮中表现出高剂量抑制淀粉酶分泌的作用。