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Triggerable plasmalogen liposomes: improvement of system efficiency

D H Thompson1, O V Gerasimov, J J Wheeler

  • 1Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA.davethom@chem.purdue.edu

Biochimica Et Biophysica Acta
|February 21, 1996
PubMed
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This study introduces a photoactivated liposome system for triggered release of hydrophilic materials. Near-infrared light triggers plasmalogen liposomes to release contents and fuse, showing potential for photodynamic therapy applications.

Area of Science:

  • Biochemistry
  • Materials Science
  • Photochemistry

Background:

  • Liposome membrane permeability is crucial for drug delivery.
  • Plasmalogen photooxidation affects membrane permeability in biological systems.
  • Controlled release systems are needed for targeted therapies.

Purpose of the Study:

  • To develop a photoactivated liposome system for triggered release.
  • To investigate the mechanism of light-induced membrane changes.
  • To evaluate the potential of this system in photodynamic therapy.

Main Methods:

  • Preparation of semi-synthetic plasmenylcholine liposomes with encapsulated calcein and sensitizers.
  • Irradiation of liposomes with 630-820 nm light in the presence of sensitizers (zinc phthalocyanine, tin octabutoxyphthalocyanine, bacteriochlorophyll a).

Related Experiment Videos

  • Analysis of membrane permeability, release rates, and membrane fusion using techniques like 31P-NMR and TEM.

    • Main Results:

    • Photoactivation increased liposome membrane permeability and promoted membrane fusion.
    • Bacteriochlorophyll a sensitization achieved rapid release (100% in <20 min) with 800 nm light.
    • Plasmenylcholine liposomes showed significantly faster release than egg lecithin liposomes.

    Conclusions:

    • Photoactivated plasmenylcholine liposomes offer a versatile system for triggered release.
    • The observed membrane fusion capabilities are advantageous for therapeutic applications.
    • This system is a promising adjunct to biochemical targeting in photodynamic therapy.