A dimerizable cationic lipid with potential for gene delivery

Background Despite the use of currently optimized lipofection conditions, including transfection in serum-depleted media, the efficiency of gene transfer is low and high transfection rates often induce cytotoxicity. A lipid formulation with transfection efficiency not inhibited by serum would provide an advance towards in vivo applications. Methods We explored the ability of the cationic lipid SH-14 to dimerize upon DNA and form lipoplexes, and potentially release nucleic acids in the intracellular reducing milieu. We investigated the critical micelle-forming concentration of SH-14 and its intrinsic toxicity, size and Zeta potential measurements, the in vitro cytotoxicity of SH-14/plasmid DNA lipoplexes and their ability to transfect cells. Results Among all the charge ratios (CR, +/-) tested, lipoplexes at CR 10 with a mean diameter of 295 nm and a surface charge of +20 mV, exhibited the best compromise between transfection efficiency and tolerability. SH-14 presented the same cytotoxicity level whether alone or complexed in lipoplexes. Lipofections carried out in serum-free medium shared a transfection. efficiency, on average, of 40% and a cytotoxicity of 38%. An increase of 73% in transfection efficiency and 24% in cell viability were obtained, extending lipofection over 48 h in complete-medium. Moreover, when serum concentration was increased from 10% to 50%, a three-fold increase in plasmid dose led to more than 72% of cells being transfected with almost no sign of cytotoxicity.