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- W2625681310 abstract "Cationic lipids (CLs) are being increasingly exploited as transfection vectors for the delivery of DNA into eukaryotic cells. To obtain further insight to the complex formation and interactions between cationic liposomes and DNA, we characterised three novel cationic lipids, viz. bis[2-(11-phenoxyundecanoate)ethyl]-dimethylammonium bromide, N-hexadecyl-N-{10-[O-(4-acetoxy)-phenylundecanoate]ethyl}dimethylammonium bromide, and bis[2-(11-butyloxyundecanoate)ethyl]dimethylammonium bromide. These lipids bear the same charged headgroup yet have different hydrophobic parts. Accordingly, we may anticipate their electrostatic interactions with DNA to be similar while differing in both thermal phase behaviour and physicochemical properties of their complexes with DNA. In keeping with the above all three lipids formed complexes with DNA as evidenced by light scattering, fluorescence spectroscopy and Langmuir film balance. Differential scanning calorimetry revealed very different phase behaviours for the binary mixtures of the three CLs with dimyristoylphosphatidylcholine and also provided evidence for DNA-induced lipid phase separation. These data were confirmed by compression isotherms and fluorescence microscopy of monolayers residing on an aqueous buffer, recorded both in the presence and absence of DNA. Importantly, binding to cationic liposomes appears to prevent thermal denaturation of DNA upon heating of the complexes. Likewise, renaturation of heat-treated DNA complexed with the cationic liposomes appears to be abolished as well." @default.
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- W2625681310 date "2006-09-01" @default.
- W2625681310 modified "2023-10-17" @default.
- W2625681310 doi "https://doi.org/10.1016/j.wpi.2006.03.008" @default.
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