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Published on: May 1, 2018
How to make siRNA lipoplexes efficient? Add a DNA cargo
Hervé Rhinn1, Céline Largeau, Pascal Bigey
1Inserm, U640, Paris, F-75006 France.
Biochimica Et Biophysica Acta
|August 29, 2009
Summary
Adding DNA cargo to small interfering RNA (siRNA) lipoplexes enhances gene silencing efficiency in vitro. This strategy improves siRNA delivery at lower concentrations and in serum conditions.
Area of Science:
- Biochemistry
- Molecular Biology
- Gene Therapy
Background:
- Previously developed an efficient siRNA formulation targeting TNF-alpha for arthritis treatment.
- The efficient formulation involved pre-association of siRNA with a DNA cargo.
Purpose of the Study:
- To extensively characterize siRNA lipoplexes with and without DNA cargo.
- To understand the mechanism behind the DNA cargo's enhancing effect on siRNA delivery.
Main Methods:
- Dynamic light scattering (DLS) and transmission electron microscopy (TEM) for structural analysis.
- In vitro gene silencing assays.
- Assessment of lipid requirements for complex neutrality.
- Evaluation of complex stability with heparan sulfate.
Main Results:
- DNA cargo addition to siRNA lipoplexes resulted in specific gene silencing in vitro at reduced siRNA concentrations.
- The procedure was effective with various lipid vectors, including Lipofectamine and DMRIE-C.
- No structural changes in siRNA lipoplexes were detected via DLS or TEM upon DNA cargo addition.
- Minor differences observed in lipid requirements for complex neutrality and stability against heparan sulfate.
Conclusions:
- DNA cargo addition is a simple method to create more efficient siRNA complexes.
- These enhanced complexes facilitate siRNA transfer at low concentrations and in the presence of serum.
- This approach holds potential for improved gene therapy applications.
