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2018 ; 3
(6
): 6812-6819
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Effective Theranostic Cyanine for Imaging of Amyloid Species in Vivo and
Cognitive Improvements in Mouse Model
#MMPMID30023962
Li Y
; Chen C
; Xu D
; Poon CY
; Ho SL
; Zheng R
; Liu Q
; Song G
; Li HW
; Wong MS
ACS Omega
2018[Jun]; 3
(6
): 6812-6819
PMID30023962
show ga
We report herein an investigation of carbazole-based cyanine,
(E)-4-(2-(9-(2-(2-methoxyethoxy)ethyl)-9H-carbazol-3-yl)-vinyl)-1-methyl-quinolin-1-iumiodide
(SLM), as an effective theranostic agent for Alzheimer's disease (AD). This
cyanine exhibited desirable multifunctional and biological properties, including
amyloid-? (A?)-oligomerization inhibition, blood-brain barrier permeability, low
neurotoxicity, neuroprotective effect against A?-induced toxicities, high
selectivity and strong binding interactions with A? peptide/species, good
biostability, as well as strong fluorescence enhancement upon binding to A?
species for diagnosis and therapy of AD. This cyanine has been successfully
applied to perform near-infrared in vivo imaging of A? species in transgenic AD
mouse model. The triple transgenic AD mice intraperitoneally treated with SLM
showed significant recovery of cognitive deficits. Furthermore, those SLM-treated
mice exhibited a substantial decrease in both of oligomeric A? contents and tau
proteins in their brain, which was attributed to the induction of autophagic
flux. These findings demonstrated for the first time that SLM is an effective
theranostic agent with in vivo efficacy for diagnosis and treatment of AD in
mouse models.