title: Di- and triblock siRNA-PEG copolymers: PEG density effect of polyelectrolyte complexes on cellular uptake and gene silencing efficiency.
abstract: Di- and triblock siRNA/PEG copolymers were synthesized and complexed with cationic SLN for assessing their gene silencing efficiency as a function of PEG density. A sssiRNA and a sassiRNA were separately conjugated with PEG via a disulfide linkage. AB-type diblock and ABA-type triblock copolymers were successfully prepared by stoichiometric hybridization of sssiRNA-PEG conjugate with sassiRNA and sassiRNA-PEG conjugate, respectively. The resultant di- and triblock copolymers were characterized by means of GPC and gel electrophoresis. The serum stability of siRNA in the copolymers was enhanced as compared to that of naked siRNA. Using cationic SLN as a model carrier, the PEGylation density effect of the siRNA-PEG/SLN complexes on gene silencing and cellular uptake was analyzed.
authors.affiliation: Department of Biological Sciences and Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.
authors.forename: Soo Hyeon
authors.initials: SH
authors.lastname: Lee
authors.forename: Hyejung
authors.initials: H
authors.lastname: Mok
authors.forename: Tae Gwan
authors.initials: TG
authors.lastname: Park
mesh_terms: D045744:Cell Line, Tumor; D004573:Electrolytes / Q000737:chemistry*; D020868:Gene Silencing; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006801:Humans; D042541:Intracellular Space / Q000378:metabolism; D008055:Lipids / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry*; D034741:RNA, Small Interfering / Q000378:metabolism*; D013499:Surface Properties
chemical_list: D004573:Electrolytes; D008055:Lipids; D034741:RNA, Small Interfering; D049452:Green Fluorescent Proteins; D011092:Polyethylene Glycols