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- W2019019265 abstract "Novel formulations based on physiologically occurring anionic lipids have been designed to achieve safe and efficient siRNA delivery. Anionic liposomes (DOPG/DOPE) were complexed with siRNA using calcium ion bridges to prepare anionic lipoplexes. Various formulation parameters (liposome composition, lipid and calcium concentration) were evaluated and optimized to achieve efficient silencing and high cell viability in breast cancer cells. The optimal anionic lipoplexes composed of 1 μg/mL lipid (40:60 (DOPG/DOPE m/m)), 2.4 mM calcium and 10 nM siRNA, showed maximum silencing (∼70% knockdown) without being cytotoxic. These lipoplexes also showed stability and high efficiency in the presence of serum. Additionally, optimal anionic lipoplexes showed efficient intracellular uptake and endosomal escape. Characterization studies indicated the optimal anionic formulations were 324.2 ± 19.6 nm with a surface charge of (−22.9 ± 0.1) mV and 98.5 ± 1.4% encapsulation efficiency. Control cationic lipoplexes (Lipofectamine 2000) showed silencing comparable to the anionic lipoplexes but were highly cytotoxic as indicated by IC50 values (cationic – 22.9 μg/mL, compared to anionic – greater than 107 μg/mL). Calcium–siRNA complexes (without liposomes) showed low efficiency (∼50% silencing), and highly variable results. The optimized anionic formulations may offer a safer alternative to conventional cationic based systems for efficient in vitro as well as in vivo delivery of therapeutic siRNAs." @default.
- W2019019265 created "2016-06-24" @default.
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- W2019019265 date "2012-08-01" @default.
- W2019019265 modified "2023-10-13" @default.
- W2019019265 title "Efficient and safe delivery of siRNA using anionic lipids: Formulation optimization studies" @default.
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- W2019019265 doi "https://doi.org/10.1016/j.ijpharm.2012.04.058" @default.
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