Curcumin-conjugated magnetic nanoparticles for detecting amyloid plaques in Alzheimer's disease mice using magnetic resonance imaging (MRI)
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AbstractDiagnosis of Alzheimer's disease (AD) can be performed with the assistance of amyloid imaging. The current method relies on positron emission tomography (PET), which is expensive and exposes people to radiation, undesirable features for a population screening method. Magnetic resonance imaging (MRI) is cheaper and is not radioactive. Our approach uses magnetic nanoparticles (MNPs) made of superparamagnetic iron oxide (SPIO) conjugated with curcumin, a natural compound that specifically binds to amyloid plaques. Coating of curcumin-conjugated MNPs with polyethylene glycol-polylactic acid block copolymer and polyvinylpyrrolidone by antisolvent precipitation in a multi-inlet vortex mixer produces stable and biocompatible curcumin magnetic nanoparticles (Cur-MNPs) with mean diameter <100nm. These nanoparticles were visualized by transmission electron microscopy and atomic force microscopy, and their structure and chemistry were further characterized by X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry, and Fourier transform infrared spectroscopy. Cur-MNPs exhibited no cytotoxicity in either Madin-Darby canine kidney (MDCK) or differentiated human neuroblastoma cells (SH-SY5Y). The Papp of Cur-MNPs was 1.03×10-6cm/s in an invitro blood-brain barrier (BBB) model. Amyloid plaques could be visualized in exvivo T2*-weighted magnetic resonance imaging (MRI) of Tg2576 mouse brains after injection of Cur-MNPs, and no plaques could be found in non-transgenic mice. Immunohistochemical examination of the mouse brains revealed that Cur-MNPs were co-localized with amyloid plaques. Thus, Cur-MNPs have the potential for non-invasive diagnosis of AD using MRI.
All Author(s) ListCheng K.K., Chan P.S., Fan S., Kwan S.M., Yeung K.L., Wang Y.X.J., Chow A.H.L., Wu E.X., Baum L.
Journal nameBiomaterials
Year2015
Month1
Day1
Volume Number44
PublisherPergamon Press Ltd.
Place of PublicationUnited Kingdom
Pages155 - 172
ISSN0142-9612
eISSN1878-5905
LanguagesEnglish-United Kingdom
KeywordsAlzheimer's disease, Amyloid plaques, Curcumin, Iron oxide nanoparticles, MRI, Tg2576 mice

Last updated on 2020-25-10 at 00:33