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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 ACS+Med+Chem+Lett
2012 ; 3
(1
): 58-62
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(18)F-labeled phenyldiazenyl benzothiazole for in vivo imaging of neurofibrillary
tangles in Alzheimer s disease brains
#MMPMID24900371
Matsumura K
; Ono M
; Kimura H
; Ueda M
; Nakamoto Y
; Togashi K
; Okamoto Y
; Ihara M
; Takahashi R
; Saji H
ACS Med Chem Lett
2012[Jan]; 3
(1
): 58-62
PMID24900371
show ga
We synthesized and evaluated
(E)-4-((6-(2-(2-(2-fluoroethoxy)ethoxy)ethoxy)benzo[d]thiazol-2-yl)diazenyl)-N,N-dimethylaniline
(FPPDB) as a probe for the imaging of neurofibrillary tangles (NFTs) in patients
with Alzheimer's disease (AD). In assays using thioflavin S (ThS) as a
competitive ligand, FPPDB competed with ThS well and showed high affinity for
both tau and A?1-42 aggregates (K i = 13.0 and 20.0 nM, respectively). The
results of saturation binding assays also verified that FPPDB bound to both tau
and A?1-42 aggregates with high affinity (K d = 44.8 nM and B max = 45.8
pmol/nmol protein for tau aggregates and K d = 45.4 nM and B max = 38.9 pmol/nmol
protein for A?1-42 aggregates). Furthermore, [(18)F]FPPDB substantially labeled
NFTs and senile plaques in AD brain sections but not control brain sections. In
biodistribution experiments using normal mice, [(18)F]FPPDB displayed higher
uptake (4.28% ID/g at 2 min postinjection) into and washout (2.53% ID/g at 60 min
postinjection) from the brain with time. On the basis of the chemical structure
of FPPDB, further increases in selective binding to tau aggregates may lead to
the development of more useful probes for the imaging of NFTs in AD brains.