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Impact on antibody responses of B-cell-restricted transgenic expression of a viral gene inhibiting activation of NF-κB and NFAT

de Paiva e Almeida, Sílvia Cristina, de Oliveira, Vivian Leite, Parkhouse, Robert Michael Evans
Archives of virology 2015 v.160 no.6 pp. 1477-1488
African swine fever virus, B-lymphocytes, antibodies, antibody formation, antigens, enhancer elements, erythrocytes, gene expression, genes, genetically modified organisms, hemocyanin, immunoglobulin G, immunoglobulin M, mice, promoter regions, sheep, transcription (genetics), transcription factor NF-kappa B
In this work, we have assessed the impact in vivo of the evasion gene A238L of African swine fever virus, an inhibitor of both NF-κB- and NFAT-mediated transcription. The A238L gene was selectively expressed in mouse B lymphocytes using the promoter and enhancer sequences of the mouse Ig μ heavy chain. The IgM primary and IgG2b secondary serological responses and the number of splenic germinal centres in response to the TD antigens DNP-keyhole limpet hemocyanin and sheep red blood cells, respectively, were both lower in the transgenic mice, whereas the response to the TI type-1 and type-2 antigens DNP-Ficoll and DNP-LPS, respectively, were normal, except for the increased levels of IgG3 at day 14 in the DNP-LPS-immunized mice. Thus, it appears that neither p65 (NF-κB) nor NFAT is essential for B-cell development but, in a manner that is still unclear, may be relevant for their function.