title: IgG responses to intranasal immunization with cholera-toxin-immobilized polymeric nanospheres in mice.
abstract: IgG responses to antigen-nanosphere hybrids were studied in mice. Cholera toxin (CT) was covalently immobilized onto the surface of polymeric nanospheres (NS) with a nanophase-separated structure consisting of a polystyrene core and a poly(methacrylic acid) graft corona. Reaction conditions favoring the dehydroxide condensation reaction of the amino group of the CT with the carboxyl group of NS effectively immobilized CT onto their surface. When CT-immobilized nanospheres (CT-NS) were suspended in aqueous solution and administrated to mice either intranasally or intramuscularly, serum IgG titers elevated with increasing time and reached a maximum level at 8 weeks after immunization. On the other hand, intranasal administration of CT alone induced an even higher serum IgG titer than that of CT-NS at 4 weeks. However, the titer gradually decreased thereafter. Thus, polymeric NS may be an effective substrate to covalently immobilize antigen on their surface, steadily inducing a high level of IgG production in response to the intranasal administration.
authors.affiliation: Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan.
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Kaneko
authors.forename: Shogo
authors.initials: S
authors.lastname: Shimomai
authors.forename: Mutsumi
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Masanori
authors.initials: M
authors.lastname: Baba
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Akashi
mesh_terms: D000281:Administration, Intranasal; D000818:Animals; D002772:Cholera Toxin / Q000737:chemistry / Q000276:immunology*; D007114:Immunization / Q000379:methods*; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000097:blood*; D007273:Injections, Intramuscular; D051379:Mice; D008807:Mice, Inbred BALB C; D043942:Nanotubes / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry
chemical_list: D007074:Immunoglobulin G; D011109:Polymethacrylic Acids; D011137:Polystyrenes; D002772:Cholera Toxin