Abstract
We found that stimulation of density-inhibited chicken embryo fibroblasts with serum, epidermal growth factor (EGF), platelet-derived growth factor, (PDGF), or multiplication-stimulating activity (MSA) leads to an increase in tyrosine phosphorylation of proteins in the region of Mr 40,000 (40K) to 42K. The increase in tyrosine phosphorylation after serum or EGF stimulation was transient, reaching a maximum at about 5 min and then declining. By fine-resolution analysis of proteins separated on sodium dodecyl sulfate-polyacrylamide gels, we found that after EGF stimulation, the major increase in phosphotyrosine content was in a 42K Mr protein, with a smaller increase in a 40K Mr protein. The increased phosphorylation in the 40K to 42K Mr region accounted for almost all of the increase in phosphotyrosine observed in these cells. These phosphotyrosine-containing proteins were different from the major phosphotyrosine-containing protein of Rous sarcoma virus-transformed chicken embryo fibroblasts, which migrates at an approximate Mr of 36K. Increased tyrosine phosphorylation of proteins of similar Mr was found in 3T3 cells treated with EGF, but not in NR-6 cells, which lack detectable EGF receptors. It is possible that the 40K to 42K Mr phosphotyrosine-containing proteins are involved in the integration of the biological response to a number of different growth factors.
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Selected References
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