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Anionic liposomal delivery system for DNA transfection

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Abstract

The present study investigates the use of novel anionic lipoplexes composed of physiological components for plasmid DNA delivery into mammalian cells in vitro. Liposomes were prepared from mixtures of endogenously occurring anionic and zwitterionic lipids, 1,2-dioleoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (sodium salt) (DOPG) and 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE), respectively, at a molar ratio of 17∶83 (DOPG:DOPE). Anionic lipoplexes were formed by complexation between anionic liposomes and plasmid DNA molecules encoding green fluorescence protein (GFP) using Ca2+ ions. Transfection and toxicity were evaluated in CHO-K1 cells using flow cytometry and propidium iodide staining, respectively. Controls included Ca2+-DNA complexes (without lipids), anionic liposomes (no Ca2+), and a cationic liposomal formulation. Efficient delivery of plasmid DNA and subsequent GFP expression was achieved using anionic lipoplexes. Transfection efficiency increased with Ca2+ concentration up to 14 mM Ca2+, where transfection efficiency was 7-fold higher than in untreated cells, with minimum toxicity. Further increase in Ca2+ decreased transfection. Transfection efficiency of anionic lipoplexes was similar to that of cationic liposomes (lipofect Amine), whereas their toxicity was significantly lower. Ca2+-DNA complexes exhibited minimal and irregular transfection with relatively high cytotoxicity. A model was developed to explain the basis of anionic lipoplex uptake and transfection efficacy. Effective transfection is explained on the formation of nonbilayer hexagonal lipid phases. Efficient and relatively safe DNA transfection using anionic lipoplexes makes them an appealing alternative to be explored for gene delivery.

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Author notes

  1. Siddhesh D. Patil

    Present address: Antigenics, 02421, Lexington, MA

Authors and Affiliations

  1. Department of Pharmaceutical Sciences, University of Connecticut, 06269, Storrs, CT

    Siddhesh D. Patil, David G. Rhodes & Diane J. Burgess

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  1. Siddhesh D. Patil
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  2. David G. Rhodes
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  3. Diane J. Burgess
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Correspondence to Diane J. Burgess.

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Published: October 18, 2004.

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Patil, S.D., Rhodes, D.G. & Burgess, D.J. Anionic liposomal delivery system for DNA transfection. AAPS J 6, 29 (2004). https://doi.org/10.1208/aapsj060429

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  • DOI: https://doi.org/10.1208/aapsj060429

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