Regulatory CD4+ T cell–derived IL-10 is important for B cell differentiation and the GC response. Regulatory CD4+ T cell–derived IL-10 is important for.

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Regulatory CD4+ T cell–derived IL-10 is important for B cell differentiation and the GC response. Regulatory CD4+ T cell–derived IL-10 is important for B cell differentiation and the GC response. Analysis of the B cell response in Il10f/f and Il10f/fFoxp3-Cre mice 15 days after LCMV infection. (A) Top: Representative plots of the B cell responses in Il10f/f or Il10f/fFoxp3-Cre mice. Bottom: Frequency and number of cells as indicated by the gates shown above. (B) Representative confocal images of the GC from Il10f/f or Il10f/fFoxp3-Cre mice. Right: GC sizes as measured by ImageJ. The sections were taken from four mice of each genotype. Scale bar, 100 μm. (C) Left: Frequency of plasmablasts and memory B cells defined by the expression of surface markers. Right: Absolute numbers of plasma cells and memory B cells. (D) Enzyme-linked immunosorbent assay quantification of LCMV-specific IgG2a and IgG1 antibody levels, indicated by arbitrary units (a.u.). All the analyses of the GC response were performed 15 days after acute LCMV Armstrong infection. n.s., not significant. (E) Enzyme-linked immunospot quantification of the number of LCMV-specific IgG2a and IgG1 memory B cells. All the analyses of the GC response were performed 60 days after acute LCMV Armstrong infection. Statistical analyses were performed using unpaired two-tailed Student’s t test (*P < 0.05; **P < 0.01; ***P < 0.001). Data for (A) to (C) are from one experiment representative of three experiments with three to five mice per group carried out 15 days after LCMV Armstrong infection and from four experiments with three to five mice per group carried out 12 days after LCMV Armstrong infection. Data for (D) are pooled from two experiments carried out 12 or 15 days after infection. Data for (E) are pooled from two experiments with five to seven mice per group carried out 60 days after infection. Brian J. Laidlaw et al. Sci. Immunol. 2017;2:eaan4767 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works