title: The role of B cells in in vitro induction of IFN-gamma-producing CD4+ T cells specific to Listeria monocytogens: positive and IL-10-mediated negative regulation.
abstract: We have reported that Listeria monocytogenes-specific IFN-gamma-producing CD4+ T cells are induced by in vitro 5-day culture of naive spleen cells with viable L. monocytogenes (VLM), but not induced by culture with heat-killed L. monocytogenes (HKLM). In the present study, the role of B cells in the regulation of induction of IFN-gamma-producing CD4+ T cells in the in vitro system was investigated. We found that L. monocytogenes-specific IFN-gamma-producing CD4+ T cells were not generated when B cells were depleted from spleen cells before culture with VLM although Ag-specific proliferative response was retained. IFN-gamma production by CD4+ T cells was restored by addition of B cells cultured with VLM to the culture of B cell-depleted spleen cells and VLM. In contrast, B cells cultured with HKLM could not restore the induction of IFN-gamma production when added in culture of B cell-depleted spleen cells and VLM. Analysis of cytokine gene expression by reverse transcription-polymerase chain reaction method revealed that expression of interleukin-10 (IL-10) was higher but TNF-alpha was lower in B cells cultured with HKLM when compared with that in B cells cultured with VLM. Furthermore, addition of neutralizing anti-IL-10 mAb into culture of naive spleen cells with HKLM resulted in appearance of IFN-gamma-producing cells. These results suggest that B cells have positive and negative roles in the induction of IFN-gamma-producing CD4+ T cells. The inhibition of induction of IFN-gamma-producing CD4+ T cells may depend on B cell-derived IL-10.
authors.affiliation: Department of Immunology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
authors.forename: F
authors.initials: F
authors.lastname: Song
authors.forename: G
authors.initials: G
authors.lastname: Matsuzaki
authors.forename: M
authors.initials: M
authors.lastname: Mitsuyama
authors.forename: K
authors.initials: K
authors.lastname: Nomoto
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D001483:Base Sequence; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D016207:Cytokines / Q000235:genetics; D017931:DNA Primers / Q000737:chemistry; D005260:Female; D015870:Gene Expression; D007371:Interferon-gamma / Q000096:biosynthesis; D016753:Interleukin-10 / Q000494:pharmacology; D008089:Listeria monocytogenes / Q000276:immunology*; D008212:Lymphocyte Depletion; D051379:Mice; D008809:Mice, Inbred C3H; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics; D013154:Spleen / Q000166:cytology
chemical_list: D000942:Antigens, Bacterial; D016207:Cytokines; D017931:DNA Primers; D012333:RNA, Messenger; D016753:Interleukin-10; D007371:Interferon-gamma