Non-Peptide GPIIb/IIIa Inhibitors. 20. Centrally Constrained Thienothiophene α-Sulfonamides Are Potent, Long Acting in Vivo Inhibitors of Platelet Aggregation
作者:Melissa S. Egbertson、Jacquelynn J. Cook、Bohumil Bednar、John D. Prugh、Rodney A. Bednar、Stanley L. Gaul、Robert J. Gould、George D. Hartman、Carl F. Homnick、Marie A. Holahan、Laura A. Libby、Joseph J. Lynch、Robert J. Lynch、Gary R. Sitko、Maria T. Stranieri、Laura M. Vassallo
DOI:10.1021/jm980722p
日期:1999.7.1
The synthesis and pharmacology of 4, a potent thienothiophene non-peptide fibrinogen receptor antagonist, are reported. Compound 4 inhibited the aggregation of human gel-filtered platelets with an IC50 of 8 nM and demonstrated an 8-fold improvement in affinity for isolated GPIIb/IIIa receptors over analogues possessing an isoindolinone backbone. Flow cytometry studies revealed that the binding of 4
报道了4种有效的噻吩并噻吩非肽纤维蛋白原受体拮抗剂的合成和药理作用。与具有异吲哚满酮主链的类似物相比,化合物4以8 nM的IC50抑制人凝胶过滤的血小板的聚集,并显示出对分离的GPIIb / IIIa受体的亲和力提高了8倍。流式细胞仪研究表明4与静息血小板的结合是扩散控制的过程(kon = 3.3 x 10(6)M-1 s-1),4与狗和人血小板的亲和力相当(Kd = 0.04)和分别为0.07 nM)。静脉注射5 microg / kg的剂量可完全抑制狗体内的血小板聚集[校正],口服剂量为50-90 microg / kg [校正后],然后每日低剂量为10 microg / kg [校正],足以在几天内维持约80%的离体血小板聚集抑制作用。在麻醉的狗中以77 +/- 7%抑制ADP诱导的血小板凝集会导致出血时间适度增加2.5倍,而完全抑制(100%)则导致大约10分钟的出血时间。需要增加