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Journal of Analytical Methods in Chemistry
Volume 2018 (2018), Article ID 1651989, 5 pages
Research Article

A Pyridazine-Based Fluorescent Probe Targeting Aβ Plaques in Alzheimer’s Disease

1Research Division for Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 580-185, Republic of Korea
2Technology Innovation Support Team, Korea Research Institute of Chemical Technology (KRICT), Deajeon 305-600, Republic of Korea

Correspondence should be addressed to Yong Dae Park

Received 10 October 2017; Accepted 14 December 2017; Published 27 February 2018

Academic Editor: Subhankar Singha

Copyright © 2018 Yong Dae Park et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Accumulation of β-amyloid (Aβ) plaques comprising Aβ40 and Aβ42 in the brain is the most significant factor in the pathogenesis of Alzheimer’s disease (AD). Thus, the detection of Aβ plaques has increasingly attracted interest in the context of AD diagnosis. In the present study, a fluorescent pyridazine-based dye that can detect and image Aβ plaques was designed and synthesized, and its optical properties in the presence of Aβ aggregates were evaluated. An approximately 34-fold increase in emission intensity was exhibited by the fluorescent probe after binding with Aβ aggregates, for which it showed high affinity (KD = 0.35 µM). Moreover, the reasonable hydrophobic properties of the probe (log P = 2.94) allow it to penetrate the blood brain barrier (BBB). In addition, the pyridazine-based probe was used in the histological costaining of transgenic mouse (APP/PS1) brain sections to validate the selective binding of the probe to Aβ plaques. The results suggest that the pyridazine-based compound has the potential to serve as a fluorescent probe for the diagnosis of AD.