Inhibition of monoamine oxidases A and B by simple isoquinoline alkaloids: racemic and optically active 1,2,3,4-tetrahydro-, 3,4-dihydro-, and fully aromatic isoquinolines
作者:Michael E. Bembenek、Creed W. Abell、Linda A. Chrisey、Maria D. Rozwadowska、Wieslaw Gessner、Arnold Brossi
DOI:10.1021/jm00163a025
日期:1990.1
A series of 1,2,3,4-tetrahydro-, 3,4-dihydro-, and fully aromatic isoquinolines were tested as substrates and/or inactivators of highly purified human monoamine oxidase A and B (MAO A and B). None were found to be a substrate for either enzyme, but many of these isoquinolines could selectively inhibit either MAO A or B. Stereoselective competitive inhibition of MAO A was found with the R enantiomer
测试了一系列1,2,3,4-四氢-,3,4-二氢-和完全芳族异喹啉作为高纯度人单胺氧化酶A和B(MAO A和B)的底物和/或灭活剂。没有发现是这两种酶的底物,但是这些异喹啉中的许多可以选择性抑制MAO A或B。对所有受测立体异构体的R对映异构体,包括Salsolinol(Ki = 31 microM, ),salsoline(Ki = 77 microM),salsolidine(Ki = 6 microM)和carnegine(Ki = 2 microM)。作为一类,3,4-二氢异喹啉是测试中最有效的抑制剂(Ki = 2-130 microM),而完全芳香的异喹啉对MAO A的活性中等(Ki = 17-130 microM)。这些化合物中只有极少数能明显抑制MAOB。1,2,3,4-四氢异喹啉,其2-甲基衍生物和o-甲基紫丁香碱的表观Ki值分别为15、1和29 microM,两个3,4-二氢异喹啉(化合物22和25)对MAO