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- W2037751337 startingPage "1447" @default.
- W2037751337 abstract "Cellular transfection can be accomplished by the use of synthetic amphiphiles as gene carrier system. To understand the mechanism and hence to improve the efficiency of transfection, insight into the assembly and properties of the amphiphile/gene complex is crucial. Here, we have studied the interaction between a plasmid and cationic amphiphiles, using a monolayer technique, and have examined complex assembly by atomic force microscopy. The data reveal a three-step mechanism for complex formation. In a first step, the plasmids, interacting with the monolayer, display a strong tendency of orientational ordering. Subsequently, individual plasmids enwrap themselves with amphiphile molecules in a multilamellar fashion. The size of the complex formed is determined by the supercoiled size of the plasmid, and calculations reveal that the plasmid can be surrounded by 3 to 5 bilayers of the amphiphile. The eventual size of the transfecting complex is finally governed by fusion events between individually wrapped amphiphile/DNA complexes. In bulk phase, where complex assembly is triggered by mixing amphiphilic vesicles and plasmids, a similar wrapping process is observed. However, in this case, imperfections in this process may give rise to a partial exposure of plasmids, i.e., part of the plasmid is not covered with a layer of amphiphile. We suggest that these exposed sites may act as nucleation sites for massive lipoplex clustering, which in turn may affect transfection efficiency." @default.
- W2037751337 created "2016-06-24" @default.
- W2037751337 creator A5001093083 @default.
- W2037751337 creator A5017878457 @default.
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- W2037751337 date "2000-09-01" @default.
- W2037751337 modified "2023-10-11" @default.
- W2037751337 title "Lipoplex Formation under Equilibrium Conditions Reveals a Three-Step Mechanism" @default.
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- W2037751337 doi "https://doi.org/10.1016/s0006-3495(00)76396-x" @default.
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