The epidermal growth factor receptor (EGFR) and proline rich tyrosine kinase 2 (PYK2) are involved in tissue factor dependent factor VIIa signalling in HaCaT cells

Summary

Binding of the coagulation protease factor VIIa to its receptor Tissue Factor (TF) induces intracellular signals in several cell types including HaCaT keratinocytes. TF belongs to the cytokine receptor family, but is most likely not alone in transferring the complete TF/FVIIa signal over the plasma membrane. The protease activated receptor PAR2 is involved in factor VIIa and factor Xa signal transduction. Our results indicate that the epidermal growth factor receptor (EGFR) and the proline rich tyrosine kinase 2 (PYK2) participate in TF/FVIIa signalling as formation of the TF/FVIIa complex increased the phosphorylation of these proteins. Both FVIIa protease activity and available TF were necessary for generation of the signal. Increased tyrosine phosphorylation of the EGFR was observed following TF/FVIIa complex formation on the cell surface. The EGFR kinase inhibitor tyrphostin AG1478 abrogated the TF/FVIIa-complex induced MAP kinase activation and mRNA increase of egr-1, heparin-binding EGF, and interleukin-8 following FVIIa addition. Using specific antibodies, increased phosphorylation of PYK2 tyrosine residues 402 and 580 was observed.The first site is the major autophosphorylation site and the docking site for Src family kinases. The second site is important for the kinase activity.The Src family kinase Yes and the tyrosine phosphatase SHP-2 were detected in immunoprecipitates using either antiPYK2 or anti-EGFR antibodies.Their coprecipitation with EGFR increased in the presence of FVIIa. Moreover, the coprecipitation of EGFR and PYK2 increased with FVIIa stimulation. Together, these data suggest that EGFR, PYK2, Yes, and SHP-2 are involved in transduction of the TF/FVIIa signal possibly via transactivation of the EGF receptor.

Keywords

EGFR - proline rich tyrosine kinase 2 - SHP-2 - Yes - IL-8

• References

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