Discovery of new indomethacin-based analogs with potentially selective cyclooxygenase-2 inhibition and observed diminishing to PGE2 activities
作者:Shaymaa E. Kassab、Mohammed A. Khedr、Hamed I. Ali、Mohamed M. Abdalla
DOI:10.1016/j.ejmech.2017.09.056
日期:2017.12
ring-extended analogs of indomethacin were designed based on the structure of active binding site of both COX-1 and COX-2 isoenzymes and the interaction pattern required for selective inhibition of COX-2 to improve its selectivity against COX-2. The strategy adopted for designing the new inhibitors involved i) ring extension of indomethacin to reduce the possibility of analogs to be accommodated into
基于COX-1和COX-2同工酶的活性结合位点的结构以及选择性抑制COX-2以提高其对COX-2的选择性所需的相互作用模式,设计了吲哚美辛的新的环延伸类似物。设计新抑制剂的策略涉及:i)消炎痛的环延伸,以减少类似物被容纳在COX-1狭窄的疏水通道中的可能性; ii)羧酸的缺失,以减少抑制剂形成盐桥的可能性用Arg120并最终防止COX-1抑制,并且iii)引入甲基磺酰基以增加类似物与极性侧袋相互作用的机会,这对于抑制COX-2至关重要。三个系列的四氢咔唑,涉及4,5,通过有限的反应步骤,并采用实验室友好的反应条件,以定量收率合成了9、10和12。体外和体内数据分析新候选物的分析表明 ,与吲哚美辛(IC)相比,6-甲氧基四氢咔唑4(IC 50 = 0.97μmol)对COX-2的效力和选择性有了显着提高,从而验证了扩环的作用50 = 2.63μmol)和6-甲基磺酰基四氢咔唑10a(IC 50 (=0