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- W1921275457 abstract "Abstract CD19 is a B‐cell transmembrane molecule that is critical for B‐cell activation. CD19 serves as a scaffold protein for key signal transduction molecules including Lyn, PI3K, and Vav, by providing docking sites for these molecules via phosphorylation of CD19‐Y 513 , CD19‐Y 482 , and CD19‐Y 391 . We investigated the process of CD19 tyrosine phophorylation during B‐cell activation using Ab specific for each of these phosphorylated tyrosines. BCR engagement induced differential tyrosine phosphorylation, as CD19‐Y 513 phophorylation occurred first, and CD19‐Y 482 phosphorylation was delayed and transient. Different BCR isotypes exhibited distinct patterns of CD19 phosphorylation: IgG‐BCR ligation resulted in faster phosphorylation of CD19‐Y 513 and more intense phosphorylation of CD19‐Y 391 than IgM‐BCR ligation. This affected CD19‐mediated downstream pathways involving Vav, PI3K, and Akt. Additionally, the phosphorylation profile of CD19 differed distinctly according to its plasma membrane location. CD19 phosphorylated at Y 513 was almost exclusively located within lipid rafts, whereas phosphorylated Y 482 and Y 391 were found both inside and outside of the rafts. Furthermore, the phosphorylation of all three tyrosines was remarkably enhanced and prolonged following the simultaneous stimulation of BCR and CD40. Thus, variations in phosphorylation patterns may contribute to the complexity of CD19‐regulated signal transduction." @default.
- W1921275457 created "2016-06-24" @default.
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- W1921275457 date "2010-04-01" @default.
- W1921275457 modified "2023-10-18" @default.
- W1921275457 title "Differential phosphorylation of functional tyrosines in CD19 modulates B-lymphocyte activation" @default.
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- W1921275457 doi "https://doi.org/10.1002/eji.200939848" @default.
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