The Journal of Experimental Medicine
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Published online 15 May 2000.
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© The Rockefeller University Press, 0022-1007/2000/5/1735/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 10, May 15, 2000 1735-1744


Original Article

Bruton's Tyrosine Kinase Links the B Cell Receptor to Nuclear Factor {kappa}B Activation

Urmila D. Bajpaia, Keming Zhanga, Mark Teutscha, Ranjan Senb, and Henry H. Wortisa
a Department of Pathology and Program in Immunology, Tufts University School of Medicine and Sackler School of Graduate Biomedical Sciences, Boston, Massachusetts 02111
b Rosenstiel Research Center and Department of Biology, Brandeis University, Waltham, Massachusetts 02254

Correspondence to: Henry H. Wortis, Dept. of Pathology and Program in Immunology, Tufts University School of Medicine and Sackler School of Graduate Biomedical Sciences, Boston, MA 02111. Tel:617-636-6718 Fax:617-636-2990 E-mail:hwortis_sup{at}opal.tufts.edu.

The recognition of antigen by membrane immunoglobulin M (mIgM) results in a complex series of signaling events in the cytoplasm leading to gene activation. Bruton's tyrosine kinase (BTK), a member of the Tec family of tyrosine kinases, is essential for the full repertoire of IgM signals to be transduced. We examined the ability of BTK to regulate the nuclear factor (NF)-{kappa}B/Rel family of transcription factors, as the activation of these factors is required for a B cell response to mIgM. We found greatly diminished IgM- but not CD40-mediated NF-{kappa}B/Rel nuclear translocation and DNA binding in B cells from X-linked immunodeficient (xid) mice that harbor an R28C mutation in btk, a mutation that produces a functionally inactive kinase. The defect was due, in part, to a failure to fully degrade the inhibitory protein of NF-{kappa}B, I{kappa}B{alpha}. Using a BTK-deficient variant of DT40 chicken B cells, we found that expression of wild-type or gain-of-function mutant BTK, but not the R28C mutant, reconstituted NF-{kappa}B activity. Thus, BTK is essential for activation of NF-{kappa}B via the B cell receptor.

Key Words: X-linked immunodeficiency, CD40, B cell receptor, B cell activation, transcription factor


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