title: Linear topology confers in vivo gene transfer activity to polyethylenimines.
abstract: Although polyethylenimines (PEIs) are frequently used transfection agents, it is still unclear which of their properties are required for efficient gene delivery. This is even more striking when working in vivo since some PEIs are able to generate significant gene expression, whereas others are not. To facilitate a rational development of compounds with improved transfection activities, studies aimed at identifying the properties involved in the transfection process seem indispensable. In the present work, we investigated how transfection with linear PEI of 22 kDa allows for high reporter gene expression in lungs after intravenous injection, whereas the branched PEI of 25 kDa does not. To this end, we synthesized L-PEI derivatives that are intermediates between linear and branched PEIs. Our results show that the topology plays a crucial role in obtaining in vivo reporter gene expression, whereas the content of primary, secondary, and tertiary amines is only of minor importance.
authors.affiliation: Laboratoire Matériaux Polymères aux Interfaces UMR 7581, Université d'Evry, 91025 Evry Cedex, France.
authors.forename: B
authors.initials: B
authors.lastname: Brissault
authors.forename: C
authors.initials: C
authors.lastname: Leborgne
authors.forename: C
authors.initials: C
authors.lastname: Guis
authors.forename: O
authors.initials: O
authors.lastname: Danos
authors.forename: H
authors.initials: H
authors.lastname: Cheradame
authors.forename: A
authors.initials: A
authors.lastname: Kichler
mesh_terms: D000586:Amination; D000818:Animals; D001388:Aziridines / Q000737:chemistry; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004247:DNA / Q000235:genetics; D024202:Electrophoretic Mobility Shift Assay; D005260:Female; D015870:Gene Expression; D018014:Gene Transfer Techniques; D017930:Genes, Reporter / Q000235:genetics; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D015394:Molecular Structure; D011094:Polyethyleneimine / Q000737:chemistry / Q000494:pharmacology
chemical_list: D001388:Aziridines; C033132:aziridine; D011094:Polyethyleneimine; D004247:DNA