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Related Experiment Videos

Improved DNA: liposome complexes for increased systemic delivery and gene expression

N S Templeton1, D D Lasic, P M Frederik

  • 1NCI-FCRDC, ABL-Basic Research Program, Frederick, MD 21702-1201, USA.

Nature Biotechnology
|July 1, 1997
PubMed
Summary

Extruded DOTAP:cholesterol liposomes complexed with DNA enhance gene delivery. Optimal DNA:liposome complexes, 200-450 nm, show novel morphology for efficient in vivo transfection.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Nanomedicine

Background:

  • Cationic liposomes are investigated for DNA delivery.
  • Improving systemic DNA delivery efficiency remains a challenge.

Purpose of the Study:

  • To enhance cationic liposome-mediated intravenous DNA delivery.
  • To characterize DNA:liposome complexes for improved gene expression.

Main Methods:

  • Forming complexes with extruded DOTAP:cholesterol liposomes and DNA.
  • Optimizing liposome preparation using sonication, heating, and extrusion.
  • Size fractionation of DNA:liposome complexes.
  • Cryo-electron microscopy for morphological analysis.

Main Results:

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  • Enhanced chloramphenicol acetyltransferase gene expression in multiple tissues.
  • Optimal gene expression achieved with DNA:liposome complexes sized 200-450 nm.
  • Novel internal structure of DNA:liposome complexes observed via cryo-electron microscopy.

Conclusions:

  • Extruded DOTAP:cholesterol liposomes facilitate efficient in vivo gene delivery.
  • The unique morphology of DNA:liposome complexes contributes to broad tissue distribution.
  • Potential for targeted gene delivery by functionalizing the liposome structure.