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Complexes between cationic liposomes and DNA visualized by cryo-TEM

J Gustafsson1, G Arvidson, G Karlsson

  • 1Department of Physical Chemistry, Uppsala University, Sweden.

Biochimica Et Biophysica Acta
|May 4, 1995
PubMed
Summary
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Cationic liposomes complex with DNA for gene delivery. Cryo-transmission electron microscopy reveals excess lipid traps DNA in multilamellar structures, while excess DNA results in free plasmids. Surfactant choice impacts transfection but not complex structure.

Area of Science:

  • Biochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Cationic liposomes and DNA-plasmid complexes are effective gene carriers.
  • Understanding the structural basis of these complexes is crucial for optimizing gene delivery.

Purpose of the Study:

  • To investigate the association structures of cationic liposomes and DNA-plasmids using cryo-transmission electron microscopy (cryo-TEM).
  • To explore the impact of lipid composition and charge ratio on complex formation.

Main Methods:

  • Cryo-transmission electron microscopy (cryo-TEM) was used to visualize the structures.
  • Cationic liposomes composed of dioleoylphosphatidylethanolamine (DOPE) and various cationic surfactants were prepared.

Main Results:

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  • An excess of lipid (charge excess) led to DNA entrapment within aggregated multilamellar structures.
  • Increasing DNA amounts resulted in free or loosely bound plasmids near the complexes.
  • The type of DNA-vesicle association was not significantly altered by surfactant choice, despite its known impact on transfection efficiency.
  • A tendency towards polymorphism in the lipid mixtures was observed.

Conclusions:

  • The charge ratio significantly influences the structural organization of cationic liposome-DNA complexes.
  • Cryo-TEM provides valuable insights into the nanoscale architecture of gene delivery vehicles.
  • Further research into lipid mixture polymorphism may enhance gene carrier design.