Title : Syk and Lyn mediate distinct Syk phosphorylation events in FcɛRI-signal transduction: implications for regulation of IgE-mediated degranulation.

Pub. Date : 2010 Nov-Dec

PMID : 20828828






9 Functional Relationships(s)
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Protein Name
Organism
1 Syk is phosphorylated on a number of tyrosines following the binding of IgE/allergen complexes to FceRI receptors leading to initiation of inflammatory signaling via downstream enzymes and scaffolding proteins. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
2 We examined the kinases responsible for the phosphorylation of key Syk tyrosines in rat RBL-2H3 basophilic cells and bone marrow-derived mast cells (BMMCs). Tyrosine spleen associated tyrosine kinase Rattus norvegicus
3 The phosphorylation of Syk tyrosine 346 was completely blocked by the novel Src family kinase inhibitor BIRA766, suggesting this tyrosine is a pure substrate for Src family kinases. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
4 The phosphorylation of Syk tyrosine 346 was completely blocked by the novel Src family kinase inhibitor BIRA766, suggesting this tyrosine is a pure substrate for Src family kinases. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
5 This was supported by the findings that kinase-dead (KD) Syk was efficiently phosphorylated on this tyrosine and that a specific Syk inhibitor BAY61-3606 was without effect. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
6 The phosphorylation of other Syk tyrosines 317, 342, 519 and 520 was reduced by Syk and Src family inhibitors, suggesting a role for auto- and trans-phosphorylation. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
7 The phosphorylation of other Syk tyrosines 317, 342, 519 and 520 was reduced by Syk and Src family inhibitors, suggesting a role for auto- and trans-phosphorylation. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
8 Lyn was the predominant Src family kinase expressed and activated in RBL-2H3 cells, meanwhile Lyn knockdown with a specific siRNA interfered with the phosphorylation of all Syk tyrosines and the Syk substrates SLP-76 and LAT. Tyrosine spleen associated tyrosine kinase Rattus norvegicus
9 This study identifies the responsible kinases for the phosphorylation of key Syk tyrosines and the propagation of FceRI receptor mediated signal transduction in allergic responses. Tyrosine spleen associated tyrosine kinase Rattus norvegicus