Development of novel beta-amyloid probes based on 3,5-diphenyl-1,2,4-oxadiazole |
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Authors: | Ono Masahiro Haratake Mamoru Saji Hideo Nakayama Morio |
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Institution: | Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan. ono@pharm.kyoto-u.ac.jp |
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Abstract: | In the search for novel probes for the imaging in vivo of beta-amyloid plaques in Alzheimer's disease (AD) brain, we have synthesized and evaluated a series of 3,5-diphenyl-1,2,4-oxadiazole (DPOD) derivatives. The affinity for beta-amyloid plaques was assessed by an in vitro-binding assay using pre-formed synthetic Abeta42 aggregates. The new series of DPOD derivatives showed excellent affinity for Abeta aggregates with K(i) values ranging from 4 to 47nM. In biodistribution experiments using normal mice, (125)I]12, (125)I]13, (125)I]14, and (125)I]15 examined displayed sufficient uptake for imaging, ranging from 2.2 to 3.3% ID/g. But the washout of the four ligands from the brain was relatively slow. Although additional modifications are necessary to improve the uptake and rapid clearance of non-specifically bound radiotracers, the DPOD pharmacophore with high-binding affinity for Abeta aggregates may be useful as a backbone structure to develop novel beta-amyloid imaging agents. |
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