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. 2003 Mar;4(3):274-9.
doi: 10.1038/ni893. Epub 2003 Feb 3.

Essential role of Src-family protein tyrosine kinases in NF-kappaB activation during B cell development

Kaoru Saijo  1 , Christian Schmedt, I-Hsin Su, Hajime Karasuyama, Clifford A Lowell, Michael Reth, Takahiro Adachi, Alina Patke, Angela Santana, Alexander Tarakhovsky
Affiliations

Essential role of Src-family protein tyrosine kinases in NF-kappaB activation during B cell development

Kaoru Saijo et al. Nat Immunol. 2003 Mar.

Abstract

The nature of signals that govern the development of immunoglobulin heavy chain-dependent B cells is largely unknown. Using mice deficient for the B cell-expressed Src-family protein tyrosine kinases (SFKs) Blk, Fyn and Lyn, we show an essential role of these kinases in pre-B cell receptor (pre-BCR)- mediated NF-kappaB activation and B cell development. This signaling defect is SFK specific, as a deficiency in Syk, which controls pre-B cell development, does not affect NF-kappaB induction. Impaired NF-kappaB induction was overcome by the activation of protein kinase C (PKC)-lambda, thus suggesting the involvement of PKC-lambda in pre-BCR-mediated SFK-dependent activation of NF-kappaB. Our data show the existence of a functionally distinct SFK signaling module responsible for pre-BCR-mediated NF-kappaB activation and B cell development.

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