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• W1490441327 abstract "B cells play an important role both in the physiology and pathology of immune responses by production of antibodies, cytokines and by presentation of antigens. It has been shown that human CD25 expressing B cells display a mature phenotype, perform better as antigen presenting cells but secrete less immunoglobulins. The aim of this thesis was to investigate human CD25 expressing B cells phenotypically, not only in healthy individuals but also in patients with rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). Further, we have also studied the phenotype and function of CD25 expressing B cells in mice. Our results from human studies show that CD25 B cells display a highly mature and activated phenotype. These cells show high expression of IgA, IgG and CD80, and low expression of IgD and IgM both in healthy individuals and in RA patients when compared to CD25 B cells. CD25 B cells from SLE patients did not show any difference in IgA and IgG expression but did expressed higher levels of the costimulatory molecule CD80 when compared to CD25 B cells. Furthermore, we have shown that 60% of CD27 B cells in healthy controls, 51% in RA and 48% in SLE patients coexpress CD25, suggesting that CD25 B cells belong to the memory B cell population. Finally, CD25 B cells were able to produce IL-10 in much higher levels than CD25 B cells. In mice, CD25 expressing B cells from secondary lymphoid organs showed a mature and activated phenotype, high expression of the costimulatory molecules CD80 and CD86, in addition to IgA, IgG, and the early activation marker CD69. Functionally these B cells were efficient alloantigen presenting cells, they spontaneously secreted high levels of immunoglobulins of the IgA, IgG and IgM classes, were able to become antigen specific antibody secreting cells and produced high levels of different cytokines including IL-4, IL-6, IL-10, and IFN-γ. In conclusion, we have shown that human CD25 expressing B cells display a highly mature and activated phenotype and belong to memory B cell subset. Also, in mice there was a clear difference both phenotypically and functionally between the CD25 versus CD25 B cells. These data suggest that CD25 expressing B cells play a major role not just in the physiology of the immune system but also may participate in the pathogenesis of autoimmunity." @default.
• W1490441327 created "2016-06-24" @default.
• W1490441327 creator A5061511792 @default.
• W1490441327 date "2008-05-15" @default.
• W1490441327 modified "2023-09-27" @default.
• W1490441327 title "The expression and function of CD25 B cells in man and in mice" @default.
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