title: Improved stomach selectivity of gene expression following microinstillation of plasmid DNA onto the gastric serosal surface in mice.
abstract: Stomach-selective gene transfer is a promising approach as a therapeutic strategy for refractory gastric diseases. In this study, we improved the stomach selectivity of gene expression following microinstillation of naked plasmid DNA (pDNA) onto the gastric serosal surface in mice. pDNA encoding firefly luciferase was used as a reporter gene. It was confirmed that the gene expression level in the stomach 6h after gastric serosal surface microinstillation of pDNA was significantly higher than after intragastric, intraperitoneal and intravenous administration. Regarding selectivity of gene expression, the gene expression level in the stomach after gastric serosal surface microinstillation of 1 microg/1 microL (dose/volume) pDNA was 5.7 times higher than that in the spleen. In our previous study (30 microg/30 microL), the expression level in the stomach was 2.7 times higher than that in the spleen; therefore, the selectivity was 2.1 times higher in this study. When we investigated gene expression at various pDNA solution concentrations, the ratio of the gene expression level in the stomach to that in the spleen was the highest as 1 microg/1 microL of pDNA, which was considered the optimal concentration. Information in this study is useful for further development of target organ-selective gene delivery systems.
authors.affiliation: Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan.
authors.forename: Junya
authors.initials: J
authors.lastname: Nishi
authors.forename: Shintaro
authors.initials: S
authors.lastname: Fumoto
authors.forename: Hiroki
authors.initials: H
authors.lastname: Ishii
authors.forename: Yukinobu
authors.initials: Y
authors.lastname: Kodama
authors.forename: Mikiro
authors.initials: M
authors.lastname: Nakashima
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sasaki
authors.forename: Junzo
authors.initials: J
authors.lastname: Nakamura
authors.forename: Koyo
authors.initials: K
authors.lastname: Nishida
mesh_terms: D000818:Animals; D004247:DNA / Q000008:administration & dosage* / Q000737:chemistry; D005753:Gastric Mucosa / Q000378:metabolism*; D015870:Gene Expression; D018014:Gene Transfer Techniques; D017930:Genes, Reporter / Q000235:genetics; D007274:Injections, Intraperitoneal; D007275:Injections, Intravenous; D007441:Intubation, Gastrointestinal; D008156:Luciferases / Q000235:genetics; D008297:Male; D051379:Mice; D010957:Plasmids / Q000008:administration & dosage* / Q000737:chemistry / Q000235:genetics; D014018:Tissue Distribution
chemical_list: D004247:DNA; D008156:Luciferases