title: Mechanism of enhanced antigen presentation by B cells activated with anti-mu plus interferon-gamma: role of B7-2 in the activation of naive and memory CD4+ T cells.
abstract: B cells activated with anti-mu antibody plus interferon (IFN)-gamma exerted strong antigen presentation activity for T cell proliferation. The enhanced antigen presentation function was shown to be due to the increase in B7-2 expression. When B cells were stimulated with anti-mu, expression of MHC major histocompatibility complex class II, heat-stable antigen (HSA), ICAM-1 and B7-2 was increased. The presence of IFN-gamma further augmented the expression of B7-2 on anti-mu-stimulated B cells. B7-1 was not expressed on B cells under these conditions. The participation of B7-2 in the elicitation of the proliferative response of T cells was confirmed by the inclusion of anti-B7-2 antibody in cultures. The enhanced expression of either HSA or ICAM-1 was shown not to play a major role in the increased B cell antigen presentation capacity. The major T cell population responding to this activated B cell antigen presentation was shown to be CD44low naive CD4+ T cells, whereas CD45RBlow memory CD4+ T cells responded only weakly. The difference in proliferative responses between naive and memory CD4+ T cells was explained by the different efficiency in IL-2 production of these cell populations in response to antigen presentation by B cells activated by anti-mu plus IFN-gamma. These results suggest that IFN-gamma plays an important role in recruitment of naive T cells for an immune response.
authors.affiliation: Department of Allergology, University of Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Morokata
authors.forename: T
authors.initials: T
authors.lastname: Kato
authors.forename: O
authors.initials: O
authors.lastname: Igarashi
authors.forename: H
authors.initials: H
authors.lastname: Nariuchi
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology*; D000941:Antigens / Q000276:immunology*; D015703:Antigens, CD; D001402:B-Lymphocytes / Q000276:immunology*; D018122:B7-1 Antigen / Q000502:physiology*; D051940:B7-2 Antigen; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D005260:Female; D007075:Immunoglobulin M / Q000502:physiology*; D007156:Immunologic Memory; D007371:Interferon-gamma / Q000494:pharmacology*; D008213:Lymphocyte Activation; D008562:Membrane Glycoproteins / Q000502:physiology*; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D011947:Receptors, Antigen, B-Cell / Q000502:physiology
chemical_list: D000941:Antigens; D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497965:Cd86 protein, mouse; D007075:Immunoglobulin M; D008562:Membrane Glycoproteins; D011947:Receptors, Antigen, B-Cell; D007371:Interferon-gamma