title: Functional characterization of murine CD25 expressing B cells.
abstract: B cells are an important part of both innate and adaptive immune system. Their ability to produce antibodies, cytokines and to present antigen makes them a crucial part in defence against pathogens. In this study, we have in naïve Naval Medical Research Institute mice functionally characterized a subpopulation of splenic B cells expressing CD25, which comprise about 1% of the total B cell compartment. Murine spleen cells were sorted into two highly purified B cell populations either CD19(+) CD25(+) or CD19(+) CD25(-). We found that CD25(+) B cells secreted higher levels of IL-6, IL-10 and INFgamma in response to different TLR-agonists, and were better at presenting alloantigen to CD4(+) T cells. CD25 expressing B cells spontaneously secreted immunoglobulins of IgA, IgG and IgM subclass and had better migratory ability when compared with CD25(-) B cells. In conclusion, our results demonstrate that CD25(+) B cells are highly activated and functionally mature. Therefore, we suggest that this population plays a major role in the immune system and may belong to the memory B-cell population.
authors.affiliation: Institute of Molecular Medicine, Trinity Center, Dublin, Ireland. amus@tcd.ie
authors.forename: S
authors.initials: S
authors.lastname: Amu
authors.forename: I
authors.initials: I
authors.lastname: Gjertsson
authors.forename: M
authors.initials: M
authors.lastname: Brisslert
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D016175:B-Lymphocyte Subsets / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002465:Cell Movement; D002469:Cell Separation; D016207:Cytokines / Q000096:biosynthesis; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005434:Flow Cytometry; D053645:Interleukin-2 Receptor alpha Subunit / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008810:Mice, Inbred C57BL
chemical_list: D016207:Cytokines; D053645:Interleukin-2 Receptor alpha Subunit