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Related Experiment Videos

Paramagnetic polymerized liposomes as new recirculating MR contrast agents

R W Storrs1, F D Tropper, H Y Li

  • 1Lucas MRS Imaging Center, Department of Radiology, Stanford University Medical Center, CA 94305, USA.

Journal of Magnetic Resonance Imaging : JMRI
|November 1, 1995
PubMed
Summary

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Paramagnetic polymerized liposomes (PPLs) offer a well-tolerated blood pool contrast agent. These novel liposomes demonstrate an extended blood circulation half-life of 19 hours, improving MRI imaging.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiology

Background:

  • Developing effective blood pool contrast agents is crucial for advanced medical imaging.
  • Existing agents often have limitations in circulation half-life and tolerability.
  • Liposome-based agents offer potential for improved pharmacokinetic profiles.

Purpose of the Study:

  • To describe a novel paramagnetic polymerized liposome (PPL) blood pool contrast agent.
  • To evaluate the tolerability, biodistribution, and MRI enhancement of PPLs.
  • To determine the blood pool half-life of PPLs in vivo.

Main Methods:

  • PPLs were synthesized using a polymerizable lipid with a gadolinium-based head group and diacetylene acyl chains, cross-linked via UV light.
  • Biodistribution, blood pool half-life, and MR image enhancement were assessed in rats using radiolabeled PPLs.

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  • T1-weighted MRI was performed at a dose of 0.015 mmol Gd+3/kg.

    • Main Results:

    • PPLs demonstrated significant MR signal enhancement (34% in kidneys, 20% in liver) persisting for over 90 minutes.
    • Biodistribution studies showed 80% of injected PPLs remained in the blood pool after 2 hours.
    • The blood pool elimination half-life was determined to be 19 hours, significantly longer than other liposome systems.

    Conclusions:

    • Paramagnetic polymerized liposomes (PPLs) represent a well-tolerated blood pool contrast agent.
    • PPLs exhibit an extended circulatory half-life, enhancing their utility in MRI.
    • The novel PPL formulation shows promise for improved diagnostic imaging applications.