Loss of vimentin in B cells impairs antibody response in vivo.

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Loss of vimentin in B cells impairs antibody response in vivo. Loss of vimentin in B cells impairs antibody response in vivo. (A) Representative histograms showing CTV dilution profiles of primary B cells cultured in vitro. Primary B cells from WT and Vim−/− mice were purified and cultured with anti-IgM and IL-4 in vitro for 4 d. The CTV dilution profile was monitored at different time points using flow cytometry to assess cell proliferation. (B) Representative histograms showing the CTV dilution profile of primary B cells cultured in vitro. Primary B cells from WT and Vim−/− mice were cultured for 4 d in the presence of LPS and IL-4 (left panel), or anti-IgM, CD40L, and IL-4 (right panel) in vitro. The CTV dilution was assessed on day 4 using flow cytometry. (C, D) Representative flow cytometry plots and the corresponding quantification showing B-cell differentiation into (left panel) plasma cells (CD138+IgD−) or (right panel) those that underwent class switch recombination (IgG1+IgD−) of B cells cultured in vitro for 4 d in the presence of (C) LPS and IL-4 or (D) anti-IgM, CD40L, and IL-4. (E) WT and Vim−/− mice were immunised with 2 μg NP-LPS via intraperitoneal injection and serum NP-specific IgM titre on days 3, 6, and 9 after immunisation was measured using ELISA. Two-way ANOVA was used to determine statistical significance. (F) WT and Vim−/− mixed bone marrow chimeras were immunised with 50 μg of NP conjugated to keyhole limpet haemocyanin with alum via intraperitoneal injections. Blood samples were collected on days –1, 3, 7, 14, 21, 28, and 69 after immunisation and serum antigen-specific IgG was measured using ELISA. Graphs depict the titres of anti-NP23 (left panel) and anti-NP3 (right panel) IgG. Two-way ANOVA was used to determine statistical significance. (G) The ratios of anti-NP23 and anti-NP3 IgG at each time point were calculated to determine the extent of affinity maturation of the IgG. Two-way ANOVA was used to determine statistical significance. Carlson Tsui et al. LSA 2018;1:e201800060 © 2018 Tsui et al.