Potent Cyclic Antagonists of the Complement C5a Receptor on Human Polymorphonuclear Leukocytes. Relationships between Structures and Activity
作者:Darren R. March、Lavinia M. Proctor、Martin J. Stoermer、Robert Sbaglia、Giovanni Abbenante、Robert C. Reid、Trent M. Woodruff、Khemar Wadi、Natalii Paczkowski、Joel D. A. Tyndall、Stephen M. Taylor、David P. Fairlie
DOI:10.1124/mol.65.4.868
日期:2004.4
potency) from human PMNLs, with 20 compounds having high antagonist potencies (IC(50), 20 nM-1 microM). Computer modeling comparisons reveal that potent antagonists share a common cyclic backbone shape, with affinity-determining side chains of defined volume projecting from the cyclic scaffold. These results define a new pharmacophore for C5a antagonist development and advance our understanding of ligand
人C5a是具有强大的趋化性和促炎特性的血浆蛋白,其过表达与炎性疾病的严重程度相关。C5a通过高亲和力螺旋束和低亲和力C末端与多形核白细胞(PMNL)上的G蛋白偶联受体(C5aR)结合,后者仅负责受体激活。预测有效和选择性的C5a拮抗剂是有效的抗炎药,但尚未开发出用于小分子拮抗剂的药效基团,它将显着帮助药物设计。我们假设转弯构象对于C5a的C末端的活性很重要,并且本文报道了小的环状肽,这些小环肽是稳定的转弯模拟物,在C5aR上对人PMNL具有强烈的拮抗作用。比较C5a的C末端,小的无环肽配体和环状拮抗剂的溶液结构,支持转向受体结合的重要性。环状拮抗剂与PMNL上C5aR的C5a或无环激动剂之间的竞争支持了C5aR上的共同或重叠结合位点。通过竞争性放射性配体与C5a的结合(亲和力)和髓过氧化物酶从人PMNL中的释放(拮抗剂效能)评估了60个环状类似物的结构活性关系,其中20种化合物具有高拮抗剂效能(IC(50),20