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• W2067490862 abstract "Abstract The relationship between class switch recombination (CSR) and somatic hypermutation has been unclear. By using human CD27− naive B cells, we investigated the somatic hypermutation and producibility of immunoglobulins (Igs) that occur after CSR. Although neither adult CD27− nor cord blood B cells, which showed the unmutated Ig V-region genes, produced IgG, IgM, or IgA in response to conventional stimuli, they produced IgG and IgM but not IgA in the presence of Staphylococcus aureus Cowan strain (SAC) + interleukin-2 (IL-2) + IL-10 + anti-CD40 mAb + CD32 transfectants (CD40/CD32T). The naive B cells also produced IgE when combined with IL-4 + CD40/CD32T. In parallel with IgG production, the expression of mature γ1 and γ 2 transcripts was induced from naive B cells by the stimuli. The CD27 expression on human naive B cells was induced remarkably by CD40 signaling or B-cell receptor engagement, but somatic hypermutation could not be induced. The proliferation and differentiation into plasma cells were induced from naive B cells, whereas most of the plasma cells displayed very low levels of mutations in Ig V-region genes. CD27− naive B cells expressed activation-induced cytidine deaminase messenger RNA by the stimuli later than CD27+memory B cells. Our results demonstrate that CSR, but not noticeable somatic hypermutation, can be induced from CD27− naive B cells upon B-cell receptor engagement and CD40 signaling in cooperation with cytokines, suggesting that CSR and somatic hypermutation processes can occur independently, and the antibodies produced in this in vitro system are low-affinity antibodies." @default.
• W2067490862 created "2016-06-24" @default.
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• W2067490862 date "2002-01-15" @default.
• W2067490862 modified "2023-10-06" @default.
• W2067490862 title "The different process of class switching and somatic hypermutation; a novel analysis by CD27− naive B cells" @default.
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• W2067490862 doi "https://doi.org/10.1182/blood.v99.2.567" @default.
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