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Blood, 1 October 2005, Vol. 106, No. 7, pp. 2391-2398.
Prepublished online as a Blood First Edition Paper on June 7, 2005; DOI 10.1182/blood-2004-12-4894.
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Submitted December 23, 2004
Accepted May 26, 2005
Vav proteins regulate peripheral B cell survival
Elena Vigorito*, Laure Gambardella, Francesco Colucci, Simon McAdam, and Martin Turner
Laboratory of Lymphocyte Signaling and Development, Molecular Immunology Programme, The Babraham Institute, Cambridge, United Kingdom
* Corresponding author; email: elena.vigorito{at}bbsrc.ac.uk.
Mice lacking all three Vav proteins fail to produce significant numbers of recirculating follicular or marginal zone B cells. Those B cells that do mature have a shortened lifespan. The constitutive NF- B activity of resting naive B cells required Vav function and expression of c-Rel, Rel-A was reduced in Vav deficient B cells. Furthermore, the expression of the NF- B regulated anti-apoptotic genes A1 and Bcl-2 was reduced in mature Vav-deficient B cells. Over-expression of Bcl-2 restored the number of mature follicular B cells in the spleen of Vav deficient mice. When activated by BCR crosslinking Vav deficient B cells failed to activate NF- B. The Vav proteins thus regulate a NF- B dependent survival signal in naive B cells and are required for NF- B function following BCR crosslinking.

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