Abstract:
:Activation of the platelet-derived growth factor (PDGF) receptor tyrosine kinase induces tyrosine phosphorylation of Signal Transducer and Activator of Transcription (STAT) proteins. Since the PDGF receptor also activates the Src tyrosine kinase, it is possible that Src mediates tyrosine phosphorylation of STATs in PDGF-treated cells. Consistent with a role for Src in STAT activation, we found that a PDGF receptor juxtamembrane tyrosine residue required for Src activation is necessary and sufficient for activation of STATs 1 and 3. To test the Src requirement further, we made other mutations in the PDGF receptor juxtamembrane region that increased or decreased Src binding. In epithelial and fibroblast cells, PDGF activated STAT1, 3 and 6 in the absence of detectable binding and activation of Src. In addition, PDGF induced c-myc RNA expression and DNA synthesis even though Src was not detectably activated. The activation of MAP kinase and the induction of c-fos gene expression both correlated with STAT but not Src activation by the receptor. We conclude that juxtamembrane tyrosine phosphorylation is necessary for both Src tyrosine kinase and STAT activation by the betaPDGF receptor, but that both processes are regulated independently by this region.
journal_name
Oncogenejournal_title
Oncogeneauthors
Sachsenmaier C,Sadowski HB,Cooper JAdoi
10.1038/sj.onc.1202694subject
Has Abstractpub_date
1999-06-17 00:00:00pages
3583-92issue
24eissn
0950-9232issn
1476-5594journal_volume
18pub_type
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