title: Photochemically induced gene silencing using small interfering RNA molecules in combination with lipid carriers.
abstract: Novel strategies for efficient delivery of small interfering RNA (siRNA) molecules with a potential for targeting are required for development of RNA interference (RNAi) therapeutics. Here, we present a strategy that is based on delivery of siRNA molecules through the endocytic pathway, in order to develop a method for site-specific gene silencing. To achieve this, we combined the use of cationic lipids and photochemical internalization (PCI). Using the human S100A4 gene as a model system, we obtained potent gene silencing in four tested human cancer cell lines following PCI induction when using the cationic lipid jetSI-ENDO. Gene silencing was shown at both the RNA and protein levels, with no observed PCI toxicity when using the jetSI reagent and an optimized PCI protocol. This novel induction method opens for in vivo site-specific delivery of siRNA molecules toward a sequence of interest.
authors.affiliation: Department of Tumor Biology, Institute of Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Montebello, NO-0310 Oslo, Norway. sigurdbo@rr-reseach.no
authors.forename: S
authors.initials: S
authors.lastname: Bøe
authors.forename: A S
authors.initials: AS
authors.lastname: Longva
authors.forename: E
authors.initials: E
authors.lastname: Hovig
mesh_terms: D045744:Cell Line, Tumor; D015316:Genetic Therapy / Q000379:methods*; D006801:Humans; D008027:Light; D008081:Liposomes / Q000378:metabolism; D017319:Photosensitizing Agents; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics* / Q000378:metabolism*; D000071999:S100 Calcium-Binding Protein A4; D009418:S100 Proteins / Q000235:genetics; D014162:Transfection / Q000379:methods*
chemical_list: D008081:Liposomes; D017319:Photosensitizing Agents; D034741:RNA, Small Interfering; D000071999:S100 Calcium-Binding Protein A4; D009418:S100 Proteins; C077591:S100A4 protein, human