Platelet alpha IIb-beta 3 integrin engagement induces the tyrosine phosphorylation of Cbl and its association with phosphoinositide 3-kinase and Syk.

Agonist-induced platelet activation triggers 'inside-out' signalling which activates alpha IIb-beta 3, the most abundant integrin in platelet membranes. The engagement of activated alpha IIb-beta 3 integrin by linking fibrinogen is necessary for platelet aggregation, and this induces subsequent outside-in signalling, which enhances platelet activation. Here we studied the involvement of ...
Cbl during alpha IIb-beta 3-integrin-mediated signal transduction. During thrombin-induced platelet activation, Cbl was tyrosine phosphorylated, and phosphoinositide 3-kinase (PI 3-kinase) activity measured in Cbl immunoprecipitates was increased. Both Cbl phosphorylation and its association with PI 3-kinase were dependent on alpha IIb-beta 3 engagement by linking fibrinogen. The P256 and anti-LIBS6 (ligand-induced binding site 6) antibodies, which activate platelets directly through alpha IIb-beta 3, induced Cbl phosphorylation and increased the PI 3-kinase activity associated with Cbl. Both thrombin and antibodies to alpha IIb-beta 3 induced association of Cbl with the tyrosine kinase, Syk. Experiments performed with inhibitors of tyrosine kinases indicated that both Src-family kinases and Syk contribute to phosphorylation of Cbl and its consequent association with PI 3-kinase. The results show that, following integrin alpha IIb-beta 3 engagement, Cbl is tyrosine phosphorylated, recruits PI 3-kinase to this integrin signalling pathway and possibly enhances PI 3-kinase activity, downstream of Src-family tyrosine kinases and Syk activation.
Mesh Terms:
Actins, Blood Platelets, Enzyme Precursors, Fibrinogen, Humans, Intracellular Signaling Peptides and Proteins, Oncogene Protein v-cbl, Phosphatidylinositol 3-Kinases, Phosphorylation, Platelet Activation, Platelet Glycoprotein GPIIb-IIIa Complex, Protein Binding, Protein-Tyrosine Kinases, Retroviridae Proteins, Oncogenic, Tyrosine, src-Family Kinases
Biochem. J.
Date: Nov. 01, 2000
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