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The Journal of Immunology, Vol 157, Issue 11 4862-4869, Copyright © 1996 by American Association of Immunologists

ARTICLES

CD40, but not lipopolysaccharide and anti-IgM stimulation of primary B lymphocytes, leads to a persistent nuclear accumulation of RelB

M Neumann, G Wohlleben, S Chuvpilo, B Kistler, T Wirth, E Serfling and A Schimpl
Institute of Pathology, University of Wurzburg, Germany.

In this study we analyzed the effect of CD40 stimulation on the activity and nuclear appearance of Rel/nuclear factor kappaB (NF- kappaB) factors in primary murine B lymphocytes. We show that triggering of CD40 signaling pathway(s) by CD40 ligands expressed on L cells led to strong activation of an NF-kappaB-controlled beta-globin reporter gene in primary B lymphocytes from transgenic mice. Analyses of nuclear translocation of individual members of Rel proteins after CD40 induction of primary B cells showed a strong and long-lasting accumulation of RelB and, less pronounced, of c-Rel. LPS stimulation did not give rise to a persistent nuclear accumulation of RelB and c- Rel, whereas nuclear c-Rel, but not RelB, accumulated after B cell receptor stimulation. CD40 induced not only nuclear translocation but also de novo synthesis of RelB RNA and protein. S107 plasmacytoma cells, which express CD40 but are defective for the nuclear appearance of p50/p65-NF-kappaB, do not express RelB after CD40 stimulation. In S107 cells stably transfected with relB genes, stimulation of nuclear RelB translocation by CD40 was observed. These results indicate that stimulation of CD40 signaling pathways exerts a long-lasting stimulatory effect on both the transcription and nuclear translocation of RelB. Since LPS and anti-IgM were unable to activate RelB, CD40 appears to trigger a special program of gene expression involved in the proliferation and/or differentiation of B lymphocytes.


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