Radioiodinated Benzyloxybenzene Derivatives: A Class of Flexible Ligands Target to β-Amyloid Plaques in Alzheimer’s Brains
摘要:
Benzyloxybenzene, as a novel flexible scaffold without rigid planarity, was synthesized and evaluated as ligand toward A beta plaques. The binding site calculated for these flexible ligands was the hydrophobic Val18_Phe20 channel on the flat surface of A beta fiber. Structure activity relationship analysis generated a common trend that binding affinities declined significantly from para-substituted ligands to ortho-substituted ones, which was also quantitatively illustrated by 3D-QSAR modeling. Autoradiography in vitro further confirmed the high affinities of radioiodinated ligands [I-125]4, [I-125]24, and [I-125]22 (K-i = 24.3, 49.4, and 17.6 nM, respectively). In biodistribution, [I-125]4 exhibited high initial uptake and rapid washout property in the brain with brain(2 min)/brain(60 min) ratio of 16.3. The excellent in vitro and in vivo biostability of [I-125]4 enhanced its potential for clinical application in SPECT imaging of A beta plaques. This approach could also allow the design of a new generation of A beta targeting ligands without rigid and planar framework.
PHENYL BENZYL ETHER DERIVATIVE AND PREPARATION METHOD AND APPLICATION THEREOF
申请人:ZHANG Zhiyong
公开号:US20170037008A1
公开(公告)日:2017-02-09
Parts of compounds, after being labeled by radionuclide, of the phenyl benzyl ether derivative, are used as Aβ plaque imaging agent. The structural formula of the phenyl benzyl ether derivative is shown by formula (I). The present invention develops a kind of brand new phenyl benzyl ether derivative which has high affinity with Aβ plaques in brains of AD patients. The chemical structure of the phenyl benzyl ether derivative is different from that of compounds disclosed in the prior art and the phenyl benzyl ether derivative belongs to a brand new compound for diagnosing and treating AD. The obtained Aβ plaque imaging agent has the advantages that the in-vivo stability is good, the fat solubility is low, the removal speed for the brain is fast, the problem of removing the radionuclide in vivo does not exist, and the application prospect and the market value are great.
Radioiodinated Benzyloxybenzene Derivatives: A Class of Flexible Ligands Target to β-Amyloid Plaques in Alzheimer’s Brains
作者:Yanping Yang、Mengchao Cui、Xiaoyang Zhang、Jiapei Dai、Zhiyong Zhang、Chunping Lin、Yuzhi Guo、Boli Liu
DOI:10.1021/jm5004396
日期:2014.7.24
Benzyloxybenzene, as a novel flexible scaffold without rigid planarity, was synthesized and evaluated as ligand toward A beta plaques. The binding site calculated for these flexible ligands was the hydrophobic Val18_Phe20 channel on the flat surface of A beta fiber. Structure activity relationship analysis generated a common trend that binding affinities declined significantly from para-substituted ligands to ortho-substituted ones, which was also quantitatively illustrated by 3D-QSAR modeling. Autoradiography in vitro further confirmed the high affinities of radioiodinated ligands [I-125]4, [I-125]24, and [I-125]22 (K-i = 24.3, 49.4, and 17.6 nM, respectively). In biodistribution, [I-125]4 exhibited high initial uptake and rapid washout property in the brain with brain(2 min)/brain(60 min) ratio of 16.3. The excellent in vitro and in vivo biostability of [I-125]4 enhanced its potential for clinical application in SPECT imaging of A beta plaques. This approach could also allow the design of a new generation of A beta targeting ligands without rigid and planar framework.