title: Memory B cells and CD27.
abstract: Following antigen activation in germinal centers, B cells develop into memory B cells or plasma cells. Triggering via B-cell immunoglobulin receptors by antigens, cytokines and direct cell-to-cell contact by B and T cells plays an important role in the B cell differentiation into memory or plasma cells. Adult human peripheral blood B cells are separated into three subtypes by the expression of IgD and CD27, which belong to the tumor necrosis factor receptor (TNFR) family: IgD+ CD27- naive B cells, IgD+ CD27+ and IgD- CD27+ B cells. CD27+ B cells are larger cells with abundant cytoplasm carrying somatic hypermutation, and have an ability to produce immunoglobulin, indicating that CD27 is a memory marker of B cells. The ligation of CD27 yields crucial signals that positively control the entry of B cells into the pathway to plasma cells. We review observations on subpopulations and differentiation of mature B-cells by T/B cell interaction via CD27/CD70 as compared with CD40/CD154 interaction, and discuss about memory B cells.
authors.affiliation: Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan. agemats@gipac.shinshu-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Agematsu
mesh_terms: D000328:Adult; D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D015415:Biomarkers; D006801:Humans; D007136:Immunoglobulins / Q000096:biosynthesis; D007156:Immunologic Memory / Q000276:immunology*; D018124:Receptors, Tumor Necrosis Factor; D015398:Signal Transduction / Q000276:immunology; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha
chemical_list: D015415:Biomarkers; D007136:Immunoglobulins; D018124:Receptors, Tumor Necrosis Factor; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D014409:Tumor Necrosis Factor-alpha