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Related Experiment Video

Updated: Jul 21, 2025

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Published on: July 21, 2011

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Depolymerizing self-immolative polymeric lanthanide chelates for vascular imaging.

Eric Grolman1, Quinton E A Sirianni2, Joy Dunmore-Buyze3

  • 1School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada; Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada.

Acta Biomaterialia
|July 28, 2023
PubMed
Summary

New self-immolative polymeric chelates offer improved vascular imaging contrast agents. These agents circulate in the blood and then safely degrade for excretion, addressing toxicity concerns in medical imaging.

Keywords:
Contrast agentDegradableImagingSelf-immolativeX-ray computed tomography

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiology

Background:

  • Medical imaging relies on contrast agents to visualize vasculature, crucial for disease diagnosis and therapy monitoring.
  • Current contrast agents, like lanthanide chelates, face limitations such as rapid excretion or toxicity concerns from prolonged circulation.
  • Developing safe and effective vascular imaging agents is essential for advancing clinical and research applications.

Purpose of the Study:

  • To develop novel, degradable contrast agents for enhanced vascular imaging.
  • To create a platform of self-immolative polymeric chelates with tunable circulation and clearance properties.
  • To evaluate the efficacy and safety of these new agents in micro-computed tomography (micro-CT).

Main Methods:

  • Synthesized self-immolative polymers designed to chelate lanthanide ions.
  • Tuned polymer end-caps to control depolymerization rates and polymer length for circulation time.
  • Administered agents to mice and assessed blood contrast, depolymerization, excretion, and tolerance at high doses for micro-CT.

Main Results:

  • Demonstrated tunable depolymerization rates by modifying the polymer end-cap.
  • Achieved long circulation times (one hour) in mouse blood, followed by complete depolymerization into small molecules.
  • Confirmed excretion of degradation products into the bladder and observed good tolerance even at high micro-CT doses.

Conclusions:

  • Self-immolative polymeric chelates represent a promising new platform for developing advanced medical imaging contrast agents.
  • This system effectively balances the need for long circulation with safe, rapid clearance, mitigating toxicity risks.
  • The developed agents show potential for improved vascular imaging in both clinical and research settings.