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Multimodality PET/MRI agents targeted to activated macrophages.

Chuqiao Tu1, Thomas S C Ng, Russell E Jacobs

  • 1Department of Biomedical Engineering, University of California, Davis, Davis, CA, 95616, USA.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|October 30, 2013
PubMed
Summary

Researchers developed a novel PET/MRI probe using iron oxide nanoparticles. This new probe, MDIO-(64)Cu-DOTA, targets macrophages, showing promise for detecting vulnerable atherosclerotic plaques.

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Area of Science:

  • Nanotechnology
  • Biomedical Imaging
  • Materials Science

Background:

  • Multimodality imaging, especially PET/MRI, offers improved disease detection.
  • Iron oxide nanoparticles are suitable for PET/MRI probes due to high MRI sensitivity and biocompatibility.

Purpose of the Study:

  • To synthesize and characterize a novel PET/MRI probe for enhanced disease detection.
  • To develop a probe targeting macrophages for identifying vulnerable atherosclerotic plaques.

Main Methods:

  • Synthesis of dextran-coated iron oxide nanoparticles (DIO) labeled with 64Cu.
  • Modification of nanoparticles with maleic anhydride to create anionic charges (MDIO-(64)Cu-DOTA).
  • Characterization of probe size, relaxivity, and in vitro macrophage uptake via scavenger receptor type A (SR-A).

Main Results:

  • The MDIO-(64)Cu-DOTA probe exhibited specific uptake by macrophages through SR-A.
  • In vitro studies confirmed the probe's non-toxicity.
  • The modified probe showed significantly improved accumulation in macrophages compared to the non-modified version.

Conclusions:

  • MDIO-(64)Cu-DOTA is a promising PET/MRI probe for macrophage targeting.
  • The probe facilitates the identification of vulnerable atherosclerotic plaques.
  • Surface modification enhances probe accumulation in target macrophages.