Activation and Translocation of c-Src to the Cytoskeleton by Both Platelet-derived Growth Factor and Epidermal Growth Factor

We have examined the subcellular distribution and catalytic activity of c-Src tyrosine kinase after stimulation of A172 glioblastoma cells with peptide growth factors. Treatment of resting cells with platelet-derived growth factor resulted in an increase (3.5-fold) in the amount of c-Src protein associated with the cytoskeleton. In addition, an increase in specific c-Src kinase activity was observed in the cytoskeleton as well as in the cytosol and the membrane fraction. Similar effects on both c-Src redistribution and activity were seen after stimulation with epidermal growth factor. These data show that, like other signal transducing components, c-Src also becomes activated and associated to the cytoskeleton in response to growth factor stimulation. We have examined the subcellular distribution and catalytic activity of c-Src tyrosine kinase after stimulation of A172 glioblastoma cells with peptide growth factors. Treatment of resting cells with platelet-derived growth factor resulted in an increase (3.5-fold) in the amount of c-Src protein associated with the cytoskeleton. In addition, an increase in specific c-Src kinase activity was observed in the cytoskeleton as well as in the cytosol and the membrane fraction. Similar effects on both c-Src redistribution and activity were seen after stimulation with epidermal growth factor. These data show that, like other signal transducing components, c-Src also becomes activated and associated to the cytoskeleton in response to growth factor stimulation.