Cardiotonic agents. 7. Inhibition of separated forms of cyclic nucleotide phosphodiesterase from guinea pig cardiac muscle by 4,5-dihydro-6-[4-(1H-imidazol-1-yl)phenyl]-3(2H)-pyridazinones and related compounds. Structure-activity relationships and correlation with in vivo positive inotropic activity
作者:Ila Sircar、Ronald E. Weishaar、Dianne Kobylarz、Walter H. Moos、James A. Bristol
DOI:10.1021/jm00394a005
日期:1987.11
minimal. The most selective PDE III inhibitor was CI-930 (10), the 5-methyl analogue of imazodan (CI-914, 1), with an IC50 of 0.6 microM. The most potent inhibitor of PDE III was the 4,5,6,7-tetrahydrobenzimidazole analogue of 10 (31), with an IC50 of 0.15 microM. This paper describes the structural features that impart both selectivity for inhibiting type III phosphodiesterase and potency of inhibition
研究了一系列4,5-二氢-6- [4-(1H-咪唑-1-基)苯基] -3(2H)-哒嗪酮和相关化合物的结构活性关系,以体内抑制不同的豚鼠心室肌中分离的环状核苷酸磷酸二酯酶(PDE)的形式。除少数例外,这些4,5-二氢吡啶酮酮是强心型III型磷酸二酯酶的抑制剂,后者是该酶的低Km环状AMP特异性形式。对心脏I型和II型磷酸二酯酶的抑制作用极小,它们都水解环状AMP和环状GMP。最具选择性的PDE III抑制剂是CI-930(10),这是咪唑烷的5-甲基类似物(CI-914,1),IC50为0.6 microM。PDE III最有效的抑制剂是4,5,6,7-四氢苯并咪唑类似物10(31),IC50为0。15微米 本文描述了既可选择性抑制III型磷酸二酯酶又可抑制效力的结构特征。此外,还讨论了体外PDE抑制效能,体内正性肌力效能与理化性质之间的相关性。