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Published on: January 15, 2015
Physicochemical characterization of anionic lipid-based ternary siRNA complexes.
Mamta Kapoor1, Diane J Burgess
1Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269, USA.
Biochimica Et Biophysica Acta
|April 3, 2012
Summary
Physicochemical characterization of anionic lipid-based ternary complexes reveals formulation parameters influencing their efficacy. Optimizing liposome composition and charge ratios enhances siRNA loading, serum stability, and breast cancer cell silencing.
Area of Science:
- Biochemistry
- Materials Science
- Nanotechnology
Background:
- Physicochemical characterization is crucial for understanding lipoplex assemblies and their biological activity.
- Anionic lipid-based ternary complexes (liposomes, calcium ions, siRNA) show promise for breast cancer therapy.
Purpose of the Study:
- To evaluate how formulation parameters affect physicochemical attributes of anionic lipoplexes.
- To correlate these attributes with in vitro gene silencing efficiency in breast cancer cells.
Main Methods:
- Varied liposome composition (DOPG/DOPE ratio) and anionic lipid/Ca2+/siRNA molar charge ratios.
- Assessed particle size, surface charge, siRNA loading efficiency, and serum stability.
- Evaluated in vitro gene silencing efficiency in breast cancer cells.
Main Results:
- Particle size, siRNA loading, and serum stability correlated with silencing efficiency.
- Optimal formulations demonstrated high siRNA loading, serum stability, and maximum silencing.
- Physicochemical properties indicated complexed/encapsulated siRNA depending on charge ratio.
Conclusions:
- Physicochemical attributes can predict the in vitro activity of lipid-siRNA complexes.
- A model for lipid-siRNA association within anionic lipoplexes was proposed.
- Formulation optimization is key to enhancing the efficacy of these therapeutic nanoparticles.
