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Caamaño, J H; Rizzo, C A; Durham, S K; Barton, D S; Raventós-Suárez, C; Snapper, C M; Bravo, R
The Journal of experimental medicine, 01/1998, Letnik: 187, Številka: 2Journal Article
The nfkb2 gene is a member of the Rel/NF-kappa B family of transcription factors. COOH-terminal deletions and rearrangements of this gene have been associated with the development of human cutaneous T cell lymphomas, chronic lymphocytic leukemias, and multiple myelomas. To further investigate the function of NF-kappa B2, we have generated mutant mice carrying a germline mutation of the nfkb2 gene by homologous recombination. NF-kappa B2-deficient mice showed a marked reduction in the B cell compartment in spleen, bone marrow, and lymph nodes. Moreover, spleen and lymph nodes of mutant mice presented an altered architecture, characterized by diffuse, irregular B cell areas and the absence of discrete perifollicular marginal and mantle zones; the formation of secondary germinal centers in spleen was also impaired. Proliferation of NF-kappa B2-deficient B cells was moderately reduced in response to lipopolysaccharide, anti-IgD-dextran, and CD40, but maturation and immunoglobulin switching were normal. However, nfkb2 (-/-) animals presented a deficient immunological response to T cell-dependent and -independent antigens. These findings indicate an important role of NF-kappa B2 in the maintenance of the peripheral B cell population, humoral responses, and normal spleen architecture.
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