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Novel Indanone Derivatives as Potential Imaging Probes for β‐Amyloid Plaques in the Brain
Author(s) -
Qiao JinPing,
Gan ChangSheng,
Wang ChenWei,
Ge JinFang,
Nan DouDou,
Pan Jian,
Zhou JiangNing
Publication year - 2012
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.201200223
Subject(s) - human brain , senile plaques , amyloid (mycology) , chemistry , β amyloid , amyloid β , alzheimer's disease , microbiology and biotechnology , pathology , neuroscience , medicine , biology , disease
Molecular imaging probes to detect senile plaques (SPs) might help the early diagnosis of Alzheimer's disease (AD). In this study, a novel series of indanone derivatives were synthesized and characterized. In in vitro binding studies, compound 2 e exhibited a K i value of 16 n M with a human AD brain homogenate. Although they displayed relatively low affinities for 2 i and 2 j —with K i values of 99 and 237 n M , respectively—the SPs in AD brain sections were positively stained by 2 j . A method for in situ micro‐autoradiography of AD brain was developed in this study and showed clear labeling of SPs by [ 125 I] 2 i and [ 125 I] 2 j . Both [ 125 I] 2 i and [ 125 I] 2 j had suitable lipophilicities and displayed high initial uptake and rapid clearance from the mouse brains. Furthermore, [ 125 I] 2 i and [ 125 I] 2 j were more stable in human brain homogenates than in mouse brain homogenates. These data suggest that such indanone derivatives might represent potential amyloid imaging agents for the detection of SPs in AD.