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Microwave-driven Synthesis of Iron Oxide Nanoparticles for Fast Detection of Atherosclerosis
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Microwave-driven Synthesis of Iron Oxide Nanoparticles for Fast Detection of Atherosclerosis

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Atherosclerotic imaging using 4 types of superparamagnetic iron oxides: new possibilities for mannan-coated particles

Keiko Tsuchiya1, Norihisa Nitta, Akinaga Sonoda

  • 1Department of Radiology, Shiga University of Medical Science, Setatsukinowa-cho, Otsu, Shiga 520-2192, Japan(1).

European Journal of Radiology
|September 5, 2013
PubMed
Abstract

Insights

Mannan-coated superparamagnetic iron oxide (SPIO) particles, including ultrasmall SPIO (USPIO), show enhanced uptake by atherosclerotic rabbit walls. This imaging study highlights improved particle accumulation for better detection of atherosclerosis.

Area of Science:

  • Biomedical imaging
  • Nanotechnology
  • Cardiovascular research

Background:

  • Atherosclerosis diagnosis and monitoring remain critical challenges in cardiovascular medicine.
  • Superparamagnetic iron oxide (SPIO) particles are utilized as contrast agents in magnetic resonance imaging (MRI) for detecting atherosclerotic plaques.
  • Optimizing SPIO particle design for enhanced cellular uptake in atherosclerotic lesions is an active area of research.

Purpose of the Study:

  • To compare the uptake of four types of SPIO particles by the atherosclerotic rabbit aorta using MRI and histology.
  • To evaluate the influence of mannan coating and particle size (SPIO vs. ultrasmall SPIO - USPIO) on SPIO particle accumulation in atherosclerotic lesions.

Main Methods:

  • Four types of SPIO particles (SPIO, M-SPIO, USPIO, M-USPIO) were intravenously injected into Watanabe heritable hyperlipidemic rabbits.
  • In vivo contrast-enhanced magnetic resonance angiography (MRA) and in vitro MRI were performed before and after particle injection.
  • Histologic analysis using Prussian blue staining quantified iron deposition in excised aortae.

Main Results:

  • Histologic analysis revealed significantly higher iron-positive regions for M-USPIO compared to USPIO, and M-SPIO compared to SPIO.
  • In vivo MRI showed significantly greater signal-to-noise ratio (SNR) differences in rabbits treated with M-USPIO versus USPIO, and M-SPIO versus SPIO.
  • In vitro MRI indicated a trend towards lower SNR in mannan-coated SPIO-treated rabbits.

Conclusions:

  • Mannan-coated SPIO and USPIO particles demonstrate superior uptake by the atherosclerotic rabbit wall compared to their uncoated counterparts.
  • These findings suggest that mannan-functionalized SPIO particles hold promise for improved imaging of atherosclerosis.
  • Targeted delivery and enhanced cellular uptake of nanoparticles can improve diagnostic sensitivity in cardiovascular imaging.
Keywords:
AtherosclerosisAtherosclerotic plaquesMagnetic resonance imaging

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