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Non-phospholipid fusogenic liposomes

M El Baraka1, E I Pécheur, D F Wallach

  • 1URA CNRS 1856, Dynamique Moléculaire des Interactions Membranaires, Université Montpellier II, Place Eugène Bataillon, Montpellier, France.

Biochimica Et Biophysica Acta
|April 3, 1996
PubMed
Summary

Non-phospholipid liposomes effectively fuse with cell membranes, enabling content mixing. This discovery advances understanding of liposome interactions and potential applications in drug delivery.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Materials Science

Background:

  • Liposomes are crucial for drug delivery, but their fusion capabilities with various membranes are not fully understood.
  • Non-phospholipid liposomes offer alternative structures for membrane interactions.

Purpose of the Study:

  • To investigate the fusion capacity of non-phospholipid liposomes with phospholipid membranes.
  • To characterize the extent and mechanisms of fusion between different liposome types and cell membranes.

Main Methods:

  • Utilized phase-contrast and freeze-fracture electron microscopy to visualize fusion.
  • Employed macromolecular and fluorescence probes (e.g., FRET, NBD-PE, Lissamine-PE) to assess content and lipid mixing.
  • Quantified fusion extent using terbium/dipicolinate assay and fluorescence measurements.

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Main Results:

  • Non-phospholipid liposomes demonstrated fusion with erythrocyte and fibroblast plasma membranes.
  • Confirmed fusion between phosphatidylcholine liposomes and non-phospholipid liposomes.
  • Quantified membrane fusion extent between 25% and 64% using multiple probe techniques.

Conclusions:

  • Non-phospholipid liposomes, particularly those with dioxyethylene acyl ethers and cholesterol, can fuse with phospholipid membranes.
  • Fusion involves both internal content and lipid component mixing.
  • These findings support the potential of non-phospholipid liposomes in biological applications.