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. 1993 Jul;12(7):2691–2696. doi: 10.1002/j.1460-2075.1993.tb05930.x

Tyrosine phosphorylation of CD19 in pre-B and mature B cells.

N J Chalupny 1, S B Kanner 1, G L Schieven 1, S F Wee 1, L K Gilliland 1, A Aruffo 1, J A Ledbetter 1
PMCID: PMC413517  PMID: 7687539

Abstract

Cross-linking of B cell surface immunoglobulins (sIg) results in activation of mature B cells and stimulates a molecular signaling mechanism for antigen-specific B cell expansion and differentiation. This signaling pathway is dependent on tyrosine (Tyr) phosphorylation and results in the activation of sIg-associated src family kinases and p72SYK. Rapid Tyr phosphorylation occurs on multiple protein substrates. Here we show that activation of B cells by cross-linking sIg results in an increase in Tyr phosphorylation of the lineage-restricted B cell surface antigen CD19, and show that it is a major substrate of activated Tyr kinase following sIg stimulation. Lower levels of constitutive CD19 Tyr phosphorylation occurred in most sIg+ mature B cell lines examined and in normal dense tonsillar B cells. We also find that when CD19 is Tyr-phosphorylated it becomes competent to interact with SH2 domains suggesting a mechanism whereby, following B cell activation, CD19 could be linked to intracellular signaling pathways. In sIg- pre-B cell lines, CD19 was expressed but was not constitutively phosphorylated on tyrosine. Upon CD19 cross-linking, Tyr phosphorylation of CD19 was induced in sIg- pre-B cell lines. CD19 cross-linking also directly induced Tyr phosphorylation of CD19 and other substrates in mature B cells. The ability of CD19 to signal in the absence of sIg expression may provide important stimulation in pre-B cell development.

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