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Original Article |
B Is Required for the Development of Marginal Zone B Lymphocytes
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)-
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-
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-
Bp50, NF-
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-
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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