%0 Journal Article %1 Pichon2002a %A Pichon, Chantal %A LeCam, Eric %A Guérin, Brigitte %A Coulaud, Dominique %A Delain, Etienne %A Midoux, Patrick %D 2002 %J Bioconjug Chem %K methods chemistry/pharmacology;DrugCarriers chemistry/genetics;Dithiothreitol chemistry;Electrochemistry;FluorescentDyes;Humans;IndicatorsandReagents;Luciferases Electron;Oxidation-Reduction;Plasmids analogs/&/derivatives/chemistry;Microscopy chemistry/pharmacology;Transfection genetics;Lysine chemistry/genetics;Polymers;ReducingAgents;Thioredoxins Cations;CellLine;DNA %N 1 %P 76--82 %T PolyLys-(AEDTP): a cationic polymer that allows dissociation of pDNA/cationic polymer complexes in a reductive medium and enhances polyfection. %V 13 %X Polyplexes of high stability resulting from the condensation of a plasmid DNA by a cationic polymer are widely used to develop polymer-based gene delivery systems. However, the plasmid must be released from its vector once inside the cells for an efficient expression of the exogenous gene in the cell nucleus. We have designed a disulfide-containing cationic polymer termed polyLys-(AEDTP) which allowed for the formation of polyplexes and the release of the plasmid in a reductive medium. The amino groups of polylysine were substituted with 3-(2-aminoethyldithio)propionyl residues in order to have each amino group of polyLys-(AEDTP) interacting with a phosphate DNA linked to the polymer backbone via a disulfide bond. As evidenced by agarose gel electrophoresis and ethidium bromide/pDNA fluorescence restoration, polyLys-(AEDTP) polyplexes were decondensed and the plasmid released upon treatment with either dithiothreitol, glutathione in the presence of glutathione reductase, or the thioredoxin reductase. Electron microscopy showed that polyplexes exhibiting spherical particles of a mean size at about 100 nm were decondensed in the presence of glutathione and exhibited filamentous aggregates. Finally, we found that the transfection of 293T7 and HepG2 cells was 10- and 50-fold more efficient with polyLys-(AEDTP) polyplexes, respectively, than with polyLys polyplexes. These results indicate that disulfide-containing cationic polymers must be borne in mind for developing polymer-base gene delivery systems.

@article{Pichon2002a, abstract = {Polyplexes of high stability resulting from the condensation of a plasmid DNA by a cationic polymer are widely used to develop polymer-based gene delivery systems. However, the plasmid must be released from its vector once inside the cells for an efficient expression of the exogenous gene in the cell nucleus. We have designed a disulfide-containing cationic polymer termed poly[Lys-(AEDTP)] which allowed for the formation of polyplexes and the release of the plasmid in a reductive medium. The amino groups of polylysine were substituted with 3-(2-aminoethyldithio)propionyl residues in order to have each amino group of poly[Lys-(AEDTP)] interacting with a phosphate DNA linked to the polymer backbone via a disulfide bond. As evidenced by agarose gel electrophoresis and ethidium bromide/pDNA fluorescence restoration, poly[Lys-(AEDTP)] polyplexes were decondensed and the plasmid released upon treatment with either dithiothreitol, glutathione in the presence of glutathione reductase, or the thioredoxin reductase. Electron microscopy showed that polyplexes exhibiting spherical particles of a mean size at about 100 nm were decondensed in the presence of glutathione and exhibited filamentous aggregates. Finally, we found that the transfection of 293T7 and HepG2 cells was 10- and 50-fold more efficient with poly[Lys-(AEDTP)] polyplexes, respectively, than with poly[Lys] polyplexes. These results indicate that disulfide-containing cationic polymers must be borne in mind for developing polymer-base gene delivery systems.}, added-at = {2011-08-01T20:07:42.000+0200}, author = {Pichon, Chantal and LeCam, Eric and Guérin, Brigitte and Coulaud, Dominique and Delain, Etienne and Midoux, Patrick}, biburl = {https://www.bibsonomy.org/bibtex/26f09b20ebe59c2f57c29775c3aff4387/crc_chus}, institution = {Centre de Biophysique Moléculaire, CNRS UPR 4301, rue Charles Sadron, F-45071 Orléans Cedex 02, France.}, interhash = {956e66824debddab5e363211b53e5154}, intrahash = {6f09b20ebe59c2f57c29775c3aff4387}, journal = {Bioconjug Chem}, keywords = {methods chemistry/pharmacology;DrugCarriers chemistry/genetics;Dithiothreitol chemistry;Electrochemistry;FluorescentDyes;Humans;IndicatorsandReagents;Luciferases Electron;Oxidation-Reduction;Plasmids analogs/&/derivatives/chemistry;Microscopy chemistry/pharmacology;Transfection genetics;Lysine chemistry/genetics;Polymers;ReducingAgents;Thioredoxins Cations;CellLine;DNA}, language = {eng}, medline-pst = {ppublish}, number = 1, pages = {76--82}, pii = {bc015503o}, pmid = {11792180}, timestamp = {2011-08-01T20:07:42.000+0200}, title = {Poly[Lys-(AEDTP)]: a cationic polymer that allows dissociation of pDNA/cationic polymer complexes in a reductive medium and enhances polyfection.}, volume = 13, year = 2002 }