Selective Butyrylcholinesterase Inhibitors Using Polyphenol-polyphenol Hybrid Molecules
作者:Yeun-Ji Woo、Bo-Hyun Lee、Go-Heum Yeun、Hyun-Ju Kim、Moo-Ho Won、Sang-Hern Kim、Bong-Ho Lee、Jeong-Ho Park
DOI:10.5012/bkcs.2011.32.8.2593
日期:2011.8.20
Polyphenols (PPs) are known as antioxidant compounds having benign biological activities. In this paper, a series of hybrid molecules between the free or acetyl protected polyphenol compounds were synthesized and their in vitro antioxidant activity (DPPH assay) and cholinesterase [acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE)] inhibition activities were evaluated. As expected, free phenolic hybrid compounds (6 and 8) showed better antioxidant activity than acetyl protected hybrid compounds (5 and 7) from DPPH assay. But the contrast result was obtained from BuChE inhibition assay. Acetyl protected hybrid compounds (5 and 7) showed better inhibition activity for BuChE than free phenolic hybrid compounds (6 and 8). Specifically, 10 (AcFA-AcFA) were shown as an effective inhibitor of BuChE ($IC_50}=2.3\pm}0.3\mu}M$) and also had a great selectivity for BuChE over AChE (more than 170 fold). Inhibition kinetic studies with acetyl protected compounds (5, 7, 9, and 10) indicated that 5, 7 and 10 are a hyperbolic mixed-type inhibition and 10 is a competitive inhibition type. The binding affinity (Ki) value of 10 to BuChE is $2.32\pm}0.15\mu}M$.
多酚(PPs)作为具有良好生物活性的抗氧化化合物为人所知。本文中,合成了一系列自由或乙酰保护的多酚化合物的杂化分子,并评估了它们的体外抗氧化活性(DPPH法)以及胆碱酯酶[乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BuChE)]抑制活性。如预期所示,自由酚类杂化化合物(6和8)相较于乙酰保护的杂化化合物(5和7)在DPPH试验中展现出更优异的抗氧化活性。但从BuChE抑制试验中获得了相反的结果,乙酰保护的杂化化合物(5和7)对BuChE显示出更强的抑制活性,优于自由酚类杂化化合物(6和8)。具体而言,10(AcFA-AcFA)被证明为BuChE的有效抑制剂($IC_50}=2.3\pm}0.3\mu}M$),并对BuChE显示出极高的选择性,超过AChE约170倍。对乙酰保护化合物(5、7、9和10)的抑制动力学研究表明,5、7和10表现为双曲线混合型抑制,而10则为竞争性抑制类型。10与BuChE的结合亲和力(Ki)值为$2.32\pm}0.15\mu}M$。