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  • Title: Synthesis and biological evaluation of 18F-labled 2-phenylindole derivatives as PET imaging probes for β-amyloid plaques.
    Author: Fu H, Yu L, Cui M, Zhang J, Zhang X, Li Z, Wang X, Jia J, Yang Y, Yu P, Jia H, Liu B.
    Journal: Bioorg Med Chem; 2013 Jul 01; 21(13):3708-14. PubMed ID: 23673220.
    Abstract:
    A novel series of fluorinated 2-phenylindole derivatives were synthesized and evaluated as β-amyloid imaging probes for PET. The in vitro inhibition assay demonstrated that their binding affinities for Aβ(1-42) aggregates ranged from 28.4 to 1097.8 nM. One ligand was labeled with (18)F ([(18)F]1a) for its high affinity (K(i)=28.4 nM), which was also confirmed by in vitro autoradiography experiments on brain sections of transgenic mouse (C57BL6, APPswe/PSEN1, 11 months old, male). In vivo biodistribution experiments in normal mice showed that this radiotracer displayed high initial uptake (5.82±0.51% ID/g at 2 min) into and moderate washout (2.77±0.31% ID/g at 60 min) from the brain. [(18)F]1a could be developed as a promising new PET imaging probe for Aβ plaques although necessary modifications are still needed.
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