title: Proliferative effect of dextran sulfate sodium (DSS)-pulsed macrophages on T cells from mice with DSS-induced colitis and inhibition of effect by IgG.
abstract: The authors have previously reported that homologous immunoglobulin (Ig)G reduces the occurrence of dextran sulfate sodium (DSS)-induced colitis, mainly by suppressing recruitment of immunocompetent cells into colitis lesions. However, the mechanisms of cell recruitment and of its suppression by IgG remain unclear. In addressing these questions, this study focused on the activation of T cells in the presence of macrophages. The authors found that [3H]-thymidine uptake of T cells from DSS-induced colitis mice, but not from normal mice, was significantly enhanced when cultured with DSS-pulsed macrophages. From the profile of cytokine production, it was suggested that T helper 1 (Th1)-type cells become predominant during stimulation. Addition of homologous IgG significantly suppressed T cell proliferation in a dose-dependent manner, while no suppressive effect was observed with heterologous IgG. Mouse IgG F(ab')2, but not Fc, fragments partially mimicked the suppressive effect of whole IgG. These findings provide evidence that Th1-type cells may play an important role in the development of DSS-induced colitis and that homologous IgG exerts its protective action at least in part through the F(ab')2 portion.
authors.affiliation: Research Division, Green Cross Corporation, Osaka, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Shintani
authors.forename: T
authors.initials: T
authors.lastname: Nakajima
authors.forename: M
authors.initials: M
authors.lastname: Sugiura
authors.forename: K
authors.initials: K
authors.lastname: Murakami
authors.forename: N
authors.initials: N
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Kagitani
authors.forename: T
authors.initials: T
authors.lastname: Mayumi
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D017252:CD3 Complex / Q000276:immunology; D002455:Cell Division; D003092:Colitis / Q000139:chemically induced / Q000276:immunology*; D016207:Cytokines / Q000378:metabolism; D016264:Dextran Sulfate / Q000494:pharmacology*; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D015759:Ionomycin / Q000494:pharmacology; D007519:Isoantigens / Q000276:immunology; D008213:Lymphocyte Activation; D008264:Macrophages / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008808:Mice, Inbred CBA; D008934:Mitogens / Q000494:pharmacology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000911:Antibodies, Monoclonal; D017252:CD3 Complex; D016207:Cytokines; D007074:Immunoglobulin G; D007519:Isoantigens; D008934:Mitogens; D015759:Ionomycin; D016264:Dextran Sulfate; D013755:Tetradecanoylphorbol Acetate