The Journal of Experimental Medicine
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Published online 16 October 2000.
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© The Rockefeller University Press, 0022-1007/2000/10/1175/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 8, October 16, 2000 1175-1182


Original Article

Nuclear Factor {kappa}B Is Required for the Development of Marginal Zone B Lymphocytes

Annaiah Cariappaa, Hsiou-Chi Lioub, Bruce H. Horwitzc, and Shiv Pillaia
a Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, Massachusetts 02129
b Division of Immunology, Department of Medicine, Cornell University Medical College, New York, New York 10021
c Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115

Correspondence to: Shiv Pillai, Massachusetts General Hospital Cancer Center, Bldg. 149, 13th St., Charlestown, MA 02129. Tel:617-726-5619 Fax:617-724-9648

Although immunoglobulin (Ig)MhiIgDlo/-CD21hi marginal zone B cells represent a significant proportion of naive peripheral splenic B lymphocytes, few of the genes that regulate their development have been identified. This subset of peripheral B cells fails to emerge in mice that lack nuclear factor (NF)-{kappa}Bp50. Less drastic reductions in marginal zone B cell numbers are also seen in the spleens of recombination activating gene (Rag)-2-/- mice reconstituted with NF-{kappa}Bp65-/- fetal liver cells and in c-Rel-/- mice. In contrast, steady-state levels of IgDhi splenic follicular B cells are not significantly reduced in the absence of NF-{kappa}Bp50, NF-{kappa}Bp65, or c-Rel. Reconstitution of B cells in Rag-2-/- mice with a mixture of p50-/-/p65-/- fetal liver cells and Rag-2-/- bone marrow cells revealed that the generation of marginal zone B cells requires the expression of NF-{kappa}B in developing B cells, as opposed to supporting cells.

Key Words: transcription factors, lymphocyte development, recombination activating gene-2-/- mice, peripheral B cells, Bruton's tyrosine kinase


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