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Sphingosine-based liposome as DNA vector for intramuscular gene delivery
Karin Baraldo1, Nicolas Leforestier, Michel Bureau
1UMR 7001 CNRS/ENSCP/Aventis Pharma-Gencell, Vitry-sur-Seine, France.
Pharmaceutical Research
|September 21, 2002
Summary
Researchers developed sphingosine-based liposomes for gene delivery. These liposomes showed potential for intramuscular gene transfer, although they inhibited gene expression in vivo.
Area of Science:
- Biotechnology
- Gene Therapy
- Nanomedicine
Background:
- Liposomes are widely used for drug and gene delivery.
- Developing effective and safe delivery systems for intramuscular gene therapy remains a challenge.
Purpose of the Study:
- To create a labile sphingosine-based liposome for intramuscular gene delivery.
- To characterize the physico-chemical properties of sphingosine/phosphatidylcholine liposomes and their DNA complexes (lipoplexes).
Main Methods:
- Formulation of sphingosine-based liposomes with phosphatidylcholine (EPC).
- Association of DNA with liposomes to form lipoplexes.
- Evaluation of lipoplex characteristics, DNA stability (nuclease, serum), and in vivo gene transfer via intramuscular injection (with/without electrotransfer).
Main Results:
- Stable, positively charged sphingosine/DNA particles (170 nm) were formed.
- DNA remained accessible within lipoplexes but showed resistance to serum digestion.
- In vivo intramuscular injection of lipoplexes inhibited gene expression compared to naked DNA.
Conclusions:
- Cationic sphingosine/EPC/DNA complexes form a weakly compacted, potentially labile structure.
- This structure may be advantageous for in vivo gene transfer applications.