Adaptor protein Shc undergoes translocation and mediates up-regulation of the tyrosine kinase c-Src in EGF-stimulated A431 cells

Background: Shc is the adaptor protein that exists in three isoforms, P46, P52 and P66, and acts as a bridge between activated cell surface receptors and downstream signalling molecules which act in extracellular signal-regul ated cell events such as cell cycle progression. In our previous studies, S hc was shown to be a substrate of the tyrosine kinase c-Src in vitro and in vivo. Results: Using green fluorescent protein-fusion Shc (GFP-Shc), we have show n that following epidermal growth factor (EGF) stimulation of A431 cells, a ll Shc isoforms were rapidly recruited from the cytoplasm to the plasma mem brane (within 5 min) and then redistributed to the cytoplasmic vesicle stru ctures (in the next 10-20 min). Indirect immunofluorescent study demonstrat ed that all Shc isoforms co-localize with EGF receptor (EGFR) and activated c-Src in both plasma membranes and cytoplasmic vesicle structures. Our pre vious study has shown that EGF induces the indirect association of EGFR and c-Src and activation of c-Src in A431 cells. An immunoprecipitation study demonstrated that the EGFR-Src association and c-Src activation are augment ed in cells expressing GFP-Shc P52 or P66, but not P46. In addition, P52 an d P66, but not P46, are in association with EGFR-Src complex. We also found that EGFR and Shc can be dissociated from c-Src by the addition of a synth etic peptide that corresponds to the autophosphorylation site of c-Src. Int erestingly, the peptide-induced dissociation of the complex was not affecte d by the tyrosine phosphorylation state of the peptide. Conclusion: These results demonstrated a dynamic subcellular movement of Sh c in response to EGF, and suggested a hitherto unknown scheme whereby Shc c an work not only as a substrate of c-Src but also as a mediator of the EGF- induced activation of c-Src in an isoform-specific manner.