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Formation of Plasmid-Based Transfection Complexes with an Acid-Labile Cationic Lipid: Characterization of in Vitro and in Vivo Gene Transfer

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Abstract

Purpose. This study tests the hypothesis that gene transfer efficiency may be improved through the use of transiently stable transfection complexes that degrade within endosomal compartments and promote plasmid escape into the cytosol.

Method. An acid labile cationic lipid, O-(2R-1,2-di-O-(1`Z, 9`Z-octadecadienyl)-glycerol)-3-N-(bis-2-aminoethyl)-carbamate (BCAT), was designed, synthesized, and tested for enhanced gene transfer activity relative to non-labile controls.

Results. The O-alkenyl chains of BCAT were completely hydrolyzed after 4 h incubation in pH 4.5 buffer at 25°C. Addition of BCAT to plasmid DNA in 40%ethanol followed by ethanol evaporation yielded transfection complexes that transfected several cell types in the presence of fetal calf serum and without the need of a helper lipid. Transfection complexes prepared from BCAT displayed higher luciferase expression than the corresponding DCAT complexes (an acid-insensitive derivative of BCAT) for all cell types tested. Uptake studies showed that this increase was not due to a difference in the amount of DNA being delivered. FACS analysis for GFP expression showed that BCAT transfection complexes yielded 1.6 more transfected cells and 20%higher log mean fluorescence than DCAT transfection complexes. In vivo gene transfer was demonstrated in subcutaneous tumor-bearing mice by systemic administration of a 60 μg plasmid dose. Expression was observed in the lungs and in the tumor, with the highest activity being observed in the lungs.

Conclusions. Our results show that increased transfection can be obtained by coupling the cationic headgroup to the hydrophobic amphiphilic tails via acid-labile bonds. Acid-catalyzed release of the alkyl chains should facilitate dissociation of the cationic lipid headgroup from the plasmid, thus accelerating one of the rate-limiting steps in cationic lipid mediated transfection.

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  1. Sean M. Sullivan

    Present address: Department of Pharmaceutics, College of Pharmacy, University of Florida, Gainesville, Florida

Authors and Affiliations

  1. Department of Chemistry, Purdue University, West Lafayette, Indiana, 47907-1393

    Jeremy A. Boomer & David H. Thompson

  2. Valentis Inc., The Woodlands, Texas

    Sean M. Sullivan

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Boomer, J.A., Thompson, D.H. & Sullivan, S.M. Formation of Plasmid-Based Transfection Complexes with an Acid-Labile Cationic Lipid: Characterization of in Vitro and in Vivo Gene Transfer. Pharm Res 19, 1292–1301 (2002). https://doi.org/10.1023/A:1020342523694

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