title: Poly(L-lysine)-graft-chitosan copolymers: synthesis, characterization, and gene transfection effect.
abstract: Polypeptide/polysaccharide graft copolymers poly(L-lysine)-graft-chitosan (PLL-g-Chi) were prepared by ring-opening polymerization (ROP) of epsilon-benzoxycarbonyl L-lysine N-carboxyanhydrides (Z-L-lysine NCA) in the presence of 6-O-triphenylmethyl chitosan. The PLL-g-Chi copolymers were thoroughly characterized by 1H NMR, 13C NMR, Fourier transform infrared (FT-IR), and gel permeation chromatography (GPC). The number-average degree of polymerization of PLL grafted onto the chitosan backbone could be adjusted by controlling the feed ratio of NCA to 6-O-triphenylmethyl chitosan. The particle size of the complexes formed from the copolymer and calf thymus DNA was measured by dynamic light scattering (DLS). It was found in the range of 120 approximately 340 nm. The gel retardation electrophoresis showed that the PLL-g-Chi copolymers possessed better plasmid DNA-binding ability than chitosan. The gene transfection effect in HEK 293T cells of the copolymers was evaluated, and the results showed that the gene transfection ability of the copolymer was better than that of chitosan and was dependent on the PLL grafting ratio. The PLL-g-Chi copolymers could be used as effective gene delivery vectors.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
authors.forename: Haijun
authors.initials: H
authors.lastname: Yu
authors.forename: Xuesi
authors.initials: X
authors.lastname: Chen
authors.forename: Tiancheng
authors.initials: T
authors.lastname: Lu
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Huayu
authors.initials: H
authors.lastname: Tian
authors.forename: Jun
authors.initials: J
authors.lastname: Hu
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Peibiao
authors.initials: P
authors.lastname: Zhang
authors.forename: Xiabin
authors.initials: X
authors.lastname: Jing
mesh_terms: D002478:Cells, Cultured; D048271:Chitosan / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D002850:Chromatography, Gel; D004247:DNA / Q000737:chemistry*; D018014:Gene Transfer Techniques; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008156:Luciferases / Q000235:genetics; D009682:Magnetic Resonance Spectroscopy; D018625:Microscopy, Atomic Force; D010316:Particle Size; D011107:Polylysine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D017550:Spectroscopy, Fourier Transform Infrared; D014162:Transfection
chemical_list: D011107:Polylysine; D004247:DNA; D048271:Chitosan; D008156:Luciferases