title: Oral sensitization of W/W(v) mice with ovalbumin and possible involvement of the decrease in gammadelta-T cells.
abstract: Mast-cell-deficient WBB6F1-W/W(v) mice (W/W(v)) and congenic wild-type (+/+) mice were sensitized by oral administration of 0.1 or 1.0 mg ovalbumin (OVA) in the form of gavage every day for 9 weeks, and active systemic anaphylaxis (ASA) was induced by intraperitoneal injection of OVA. Production of OVA-specific IgG1 in response to oral sensitization of the W/W(v) mice was very high, and the production of IL-4, IL-5 and IL-10 by splenocytes re-stimulated with OVA in vitro was increased. These findings suggest that Th2-dominant helper T-cell activation had occurred. By contrast, production of OVA-specific IgG1 was low in +/+ mice, and no significant increase in production of Th2-type cytokines by the splenocytes of +/+ mice was observed. Population analysis in Peyer's patches by flow cytometry revealed that the proportion of the CD11c(+) cell in the W/W(v) mice was slightly increased after antigen stimulation. Analysis of the cell surface markers of intraepithelial lymphocytes (IELs) by flow cytometry showed that the proportion of TCRgammadelta-T cells was extremely lower in the W/W(v) mice, especially in the antigen sensitized group. The proportion of TCRgammadelta-T cells in the splenocytes of W/W(v) mice was also lower than in +/+ mice. Taken together, the above findings indicate that W/W(v) mice seems to be a good model not only for studying the induction mechanism of food allergy but for examining the role of TCRgammadelta-T cells in food-induced hypersensitivity.
authors.affiliation: Division of Biochemistry and Immunochemistry, National Institute of Health Sciences, Tokyo, Japan.
authors.forename: Haruyo
authors.initials: H
authors.lastname: Okunuki
authors.forename: Reiko
authors.initials: R
authors.lastname: Teshima
authors.forename: Naoki
authors.initials: N
authors.lastname: Harikai
authors.forename: Shinobu
authors.initials: S
authors.lastname: Sakai
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Akiyama
authors.forename: Tamio
authors.initials: T
authors.lastname: Maitani
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Sawada
mesh_terms: D000707:Anaphylaxis / Q000503:physiopathology; D000818:Animals; D001831:Body Temperature / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D016207:Cytokines / Q000096:biosynthesis; D005434:Flow Cytometry; D018928:Immunity, Mucosal / Q000276:immunology*; D007114:Immunization; D007070:Immunoglobulin A / Q000032:analysis / Q000096:biosynthesis; D007073:Immunoglobulin E / Q000032:analysis / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000032:analysis / Q000096:biosynthesis; D007413:Intestinal Mucosa / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D010047:Ovalbumin / Q000276:immunology*; D010581:Peyer's Patches / Q000166:cytology / Q000276:immunology; D019009:Proto-Oncogene Proteins c-kit / Q000096:biosynthesis; D013154:Spleen / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology
chemical_list: D016207:Cytokines; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007073:Immunoglobulin E; D010047:Ovalbumin; D019009:Proto-Oncogene Proteins c-kit