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Manganese-based liposomes. Comparative approaches

E Unger1, T Fritz, D K Shen

  • 1Department of Radiology, University of Arizona Health Sciences Center, Tucson, AZ 85724.

Investigative Radiology
|October 1, 1993
PubMed
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Manganese liposomes were developed using two methods. Liposomes with manganese bound to the membrane showed superior liver tumor imaging in rats compared to those with manganese inside.

Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Liposomes are versatile nanocarriers for drug delivery and medical imaging.
  • Manganese ions are promising contrast agents for magnetic resonance imaging (MRI).
  • Developing effective manganese-based liposomes requires optimizing manganese incorporation and vesicle structure.

Purpose of the Study:

  • To develop and compare two distinct manganese-based liposome formulations.
  • To evaluate manganese liposomes for MRI contrast enhancement in liver tumors.
  • To assess liposome characteristics including relaxivity, stability, and toxicity.

Main Methods:

  • Preparation of small unilamellar vesicles (SUVs) with entrapped manganese chloride.
  • Creation of SUVs incorporating manganese into membrane-bound complexes.

Related Experiment Videos

  • Comparative analysis of in-vitro relaxivity, stability, and toxicity.
  • In-vivo MRI studies in rats with induced liver tumors.

    • Main Results:

    • Liposome relaxivity depended on manganese concentration and phospholipid-to-manganese ratio.
    • Liposomes with membrane-bound manganese exhibited relaxivity inversely proportional to vesicle size.
    • In-vivo imaging revealed enhanced and more specific liver enhancement with membrane-bound manganese liposomes.

    Conclusions:

    • Correlation effects contribute to the relaxivity of manganese within phospholipid vesicles.
    • Liposomes incorporating manganese via membrane-bound complexes demonstrate superior efficacy for liver tumor imaging.