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. 1998 Dec 15;17(24):7304–7310. doi: 10.1093/emboj/17.24.7304

Induction of the antigen receptor expression on B lymphocytes results in rapid competence for signaling of SLP-65 and Syk.

Y Zhang 1, J Wienands 1, C Zürn 1, M Reth 1
PMCID: PMC1171076  PMID: 9857187

Abstract

The binding of antigen to the B cell antigen receptor (BCR) results in the activation of protein tyrosine kinases (PTKs) such as Lyn and Syk, and the phosphorylation of several substrate proteins including HS1 and SLP-65. How these signaling elements are connected to the BCR is not well understood. Using an expression vector for a tamoxifen-regulated Cre recombinase, we have developed a method that allows the inducible expression of the BCR. Disruption of the VH leader reading frame of the immunoglobulin heavy chain by two loxP sites is overcome by Cre-mediated DNA recombination and results in the cell surface expression of the BCR starting 4 h after exposure of transfected B cells to tamoxifen. This method can, in principle, be employed for the inducible expression of any secreted or type I transmembrane protein. By monitoring the activation of signaling elements in pervanadate-stimulated B cells expressing different levels of the BCR, we show here that phosphorylation of SLP-65 and Syk, but not of Lyn, is strictly dependent on the expression of the BCR on the cell surface. These data suggest that the BCR reorganizes its signaling molecules as soon as it appears on the cell surface.

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Selected References

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