title: Preparation of dendritic graft copolymer consisting of poly-(L-lysine) and arabinogalactan as a hepatocyte specific DNA carrier.
abstract: The dendriTIc graft copolymers (PAX) consisting of a poly(L-lysine) (PLL) main chain and grafts of arabinogalactan (AG) were prepared as a liver cell-specific DNA carrier. The copolymers were successfully prepared by reductive amination reaction between a reductive end of AG and epsilon-amino groups of PLL using NaBH3CN as a catalyst. The fractionation of a low molecular weight fraction (Mn = 25 kDa) from a crude AG (Mn = 33 kDa) was essential for the reaction to proceed. The resulting copolymers were isolated by ultrafiltration from unreacted AG and characterized by 1H NMR and gel permeation chromatography equipped with a multiangle laser light scattering detector (GPC-MALLS). The binding and internalization of DNA to hepatoma cells, HepG2, were considerably enhanced by complexing DNA with PAX copolymers. The interactions between PAX/DNA complexes and HepG2 cells were thoroughly inhibited in the presence of a competitor to asialoglycoprotein receptors (ASGP-R), indicating high specificity of the complex to ASGP-R. Furthermore, the PAX copolymers allowed the expression of the reporter gene. Our results reveal that the PAX copolymers may provide a new research tool for cell-specific gene delivery and eventually enhance gene-therapy technology.
authors.affiliation: Department of Biomolecular Engineering, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan.
authors.forename: J U
authors.initials: JU
authors.lastname: Park
authors.forename: T
authors.initials: T
authors.lastname: Ishihara
authors.forename: A
authors.initials: A
authors.lastname: Kano
authors.forename: T
authors.initials: T
authors.lastname: Akaike
authors.forename: A
authors.initials: A
authors.lastname: Maruyama
mesh_terms: D000818:Animals; D002470:Cell Survival; D002850:Chromatography, Gel; D004247:DNA / Q000008:administration & dosage* / Q000378:metabolism; D004337:Drug Carriers; D005685:Galactans / Q000737:chemistry*; D015870:Gene Expression; D006801:Humans; D008099:Liver / Q000166:cytology / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D011107:Polylysine / Q000737:chemistry*; D011108:Polymers; D012474:Salmon; D014407:Tumor Cells, Cultured
chemical_list: D004337:Drug Carriers; D005685:Galactans; D011108:Polymers; D011107:Polylysine; D004247:DNA; C005653:arabinogalactan