Inhibition of monoamine oxidase by selected C5- and C6-substituted isatin analogues
作者:Clarina I. Manley-King、Jacobus J. Bergh、Jacobus P. Petzer
DOI:10.1016/j.bmc.2010.11.028
日期:2011.1
are reversible inhibitors of human monoamine oxidase (MAO) A and B. Both homologues are reported to exhibit selective binding to the MAO-B isoform with (E)-5-styrylisatin being the most potent inhibitor. To further investigate these structure–activity relationships (SAR), in the present study, additional C5- and C6-substituted isatin analogues were synthesized and evaluated as inhibitors of recombinant
先前的研究表明(E)-5-苯乙烯基和(E)-6-苯乙烯基是人类单胺氧化酶(MAO)A和B的可逆抑制剂。据报道,这两个同系物都与MAO-B同工型具有选择性结合,其中(E)-5-styrylisatin是最有效的抑制剂。为了进一步研究这些结构-活性关系(SAR),在本研究中,合成了另外的C5-和C6-取代的靛红类似物,并评估了它们作为重组人MAO-A和MAO-B的抑制剂。除5-苯基异丁香素外,所有检查的类似物均为选择性MAO-B抑制剂。与相应的C6取代的同系物相比,C5取代的靛红对MAO-B表现出更高的结合亲和力。最有效的MAO-B抑制剂5-(4-苯基丁基)伊斯汀显示的IC 50值为0.66 nM,比(E)-5- styrylisatin的效价高约13倍,比伊斯汀的效价高18,500倍。发现最有效的MAO-A抑制剂是具有IC 50的5-苯基异丁值562nM。结果表明,在C5处被各种取代基取代是