title: Marginal zone, but not follicular B cells, are potent activators of naive CD4 T cells.
abstract: The early involvement of marginal zone (MZ) B lymphocytes in T-independent immune responses is well established. In this study we compared the abilities of MZ and follicular (FO) B cells to collaborate with T cells. After immunization with soluble hen egg lysozyme, both MZ and FO B cells captured Ag and migrated to T cell areas in the response to hen egg lysozyme. MZ B cells were far superior to FO B cells in inducing CD4+ T cell expansion both in vitro and in vivo. MZ, but not FO, B cells, after interaction with T cells, differentiated into plasma cells, and in addition they stimulated Ag-specific CD4+ T cells to produce high levels of Th1-like cytokines upon primary stimulation in vitro. These results indicate that MZ B cells rapidly and effectively capture soluble Ag and activate CD4+ T cells to become effector T cells. The enhanced capacity of MZ B cells to prime T cells in this study appeared to be intrinsic to MZ B cells, as both MZ and FO B cell populations express an identical Ag receptor.
authors.affiliation: Division of Developmental and Clinical Immunology and Department of Microbiology, University of Alabama, 378 Wallace Tumor Institute, Birmingham, AL 35294, USA.
authors.forename: Kalaya
authors.initials: K
authors.lastname: Attanavanich
authors.forename: John F
authors.initials: JF
authors.lastname: Kearney
mesh_terms: D000818:Animals; D017951:Antigen Presentation; D015703:Antigens, CD / Q000502:physiology; D016175:B-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D018122:B7-1 Antigen / Q000502:physiology; D051940:B7-2 Antigen; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D002454:Cell Differentiation / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D002465:Cell Movement / Q000276:immunology; D002478:Cells, Cultured; D002999:Clone Cells; D016207:Cytokines / Q000096:biosynthesis; D003713:Dendritic Cells / Q000276:immunology / Q000378:metabolism; D004705:Endocytosis / Q000276:immunology; D018984:Epitopes, T-Lymphocyte / Q000378:metabolism; D007399:Interphase / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology*; D008211:Lymphocyte Cooperation / Q000276:immunology; D008562:Membrane Glycoproteins / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D010950:Plasma Cells / Q000166:cytology; D013154:Spleen / Q000166:cytology* / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497965:Cd86 protein, mouse; D016207:Cytokines; D018984:Epitopes, T-Lymphocyte; D008562:Membrane Glycoproteins