Cited by 128Characterization and Applications of Magnetic NanoparticlesAtherosclerosis and Cardiovascular DiseasesCardiac Imaging and Diagnostics

Targeted Iron Oxide Particles for In Vivo Magnetic Resonance Detection of Atherosclerotic Lesions With Antibodies Directed to Oxidation-Specific Epitopes

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Briley-Saebo, Karen C., Cho, Young Seok, Shaw, Peter X., Ryu, Sung Kee, Mani, Venkatesh, Dickson, Stephen, Izadmehr, Ehsan, Green, Simone +2 more·2011·Journal of the American College of Cardiology

Abstract

Objectives The aim of this study was to determine whether iron oxide particles targeted to oxidation-specific epitopes image atherosclerotic lesions.Background Oxidized low-density lipoprotein plays a major role in atherosclerotic plaque progression and destabilization. Prior studies indicate that gadolinium micelles labeled with oxidation-specific antibodies allow for in vivo detection of vulnerable plaques with magnetic resonance imaging (MRI). However, issues related to biotransformation/retention of gadolinium might limit clinical translation. Iron oxides are recognized as safe and effective contrast agents for MRI. Because the efficacy of passively targeted iron particles remains variable, it was hypothesized that iron particles targeted to oxidation-specific epitopes might increase the utility of this platform.Methods Lipid-coated ultra-small superparamagnetic iron particles (LUSPIOs) (<20 nm) and superparamagnetic iron particles (<40 nm) were conjugated with antibodies targeted to either malondialdehyde-lysine or oxidized phospholipid epitopes. All formulations were characterized, and their in vivo efficacy evaluated in apolipoprotein E deficient mice 24 h after bolus administration of a 3.9-mg Fe/kg dose with MRI. In vivo imaging data were correlated with the presence of oxidation-specific epitopes with immunohistochemistry.Results MRI of atherosclerotic lesions, as manifested by signal loss, was observed after administration of targeted LUSPIOs. Immunohistochemistry confirmed the presence of malondialdehyde-epitopes and iron particles. Limited signal attenuation was observed for untargeted LUSPIOs. Additionally, no significant arterial wall uptake was observed for targeted or untargeted lipid-coated superparamagnetic iron oxide particles, due to their limited ability to penetrate the vessel wall.Conclusions This study demonstrates that LUSPIOs targeted to oxidation-specific epitopes image atherosclerotic lesions and suggests a clinically translatable platform for the detection of atherosclerotic plaque.

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Authors
Briley-Saebo, K. C., Cho, Y. S., Shaw, P. X., Ryu, S. K., Mani, V., Dickson, S., Izadmehr, E., Green, S., Fayad, Z. A., & Tsimikas, S.
Affiliations
  • Icahn School of Medicine at Mount Sinai (US)
  • Seoul National University (KR)
  • University of California San Diego (US)
  • Eulji University (KR)
Corresponding author
Tsimikas, Sotirios
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2011-01
Volume
57
Issue
3
Pages
337-347
ISSN
0735-1097 (ISSN-L)
OpenAlex
W2088395836
Cited by
128
References
34
Citations by year
2025: 4 · 2024: 6 · 2023: 2 · 2022: 6 · 2021: 9 · 2020: 8 · 2019: 9 · 2018: 10 · 2017: 5 · 2016: 9 · 2015: 11 · 2014: 9 · 2013: 13 · 2012: 16
FWCI
7.55
Type
journal article
Language
en
Open access
Locations
  • Journal of the American College of Cardiology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R01 HL71021, R01 HL78667)
  • National Institute of Biomedical Imaging and Bioengineering (R01 EB009638)
  • Fondation Leducq
  • National Institutes of Health (R21 HL091399-01A2)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Characterization and Applications of Magnetic Nanoparticles
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Cardiac Imaging and Diagnostics
Keywords
iron oxide nanoparticles, superparamagnetic iron oxide nanoparticles, oxidation-specific epitopes, atherosclerotic plaque imaging, oxidized LDL, vulnerable plaque, ApoE-deficient mice, gadolinium alternatives, lipid-coated nanoparticles
MeSH terms
Animals, Antibodies, Epitopes, Contrast Media, Ferric Compounds, Magnetic Resonance Imaging, Mice, Inbred C57BL, Oxidation-Reduction, Particle Size, Drug Delivery Systems, Mice, Knockout, Atherosclerosis, Mice

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