Roles of activated Src and Stat3 signaling in melanoma tumor cell growth
| Autor: | Alfred E. Chang, Guilian Niu, Adil Daud, Hua Yu, Douglas S. Reintgen, Tammy Bowman, Steve Shivers, Mei Huang, Alan J. Kraker, Richard Jove |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
STAT3 Transcription Factor
Cancer Research Cell division Pyridones bcl-X Protein Apoptosis Genetics medicine Tumor Cells Cultured Humans Receptor STAT3 Molecular Biology Melanoma biology Kinase JNK Mitogen-Activated Protein Kinases DNA medicine.disease Neoplasm Proteins DNA-Binding Proteins Enzyme Activation ErbB Receptors Pyrimidines src-Family Kinases Proto-Oncogene Proteins c-bcl-2 Cell culture biology.protein Cancer research Trans-Activators Myeloid Cell Leukemia Sequence 1 Protein Mitogen-Activated Protein Kinases Tyrosine kinase Cell Division Proto-oncogene tyrosine-protein kinase Src |
| Zdroj: | Oncogene. 21(46) |
| ISSN: | 0950-9232 |
| Popis: | Activation of protein tyrosine kinases is prevalent in human cancers and previous studies have demonstrated that Stat3 signaling is a point of convergence for many of these tyrosine kinases. Moreover, a critical role for constitutive activation of Stat3 in tumor cell proliferation and survival has been established in diverse cancers. However, the oncogenic signaling pathways in melanoma cells remain to be fully defined. In this study, we demonstrate that Stat3 is constitutively activated in a majority of human melanoma cell lines and tumor specimens examined. Blocking Src tyrosine kinase activity, but not EGF receptor or JAK family kinases, leads to inhibition of Stat3 signaling in melanoma cell lines. Consistent with a role of Src in the pathogenesis of melanoma, we show that c-Src tyrosine kinase is activated in melanoma cell lines. Significantly, melanoma cells undergo apoptosis when either Src kinase activity or Stat3 signaling is inhibited. Blockade of Src or Stat3 is also accompanied by down-regulation of expression of the anti-apoptotic genes, Bcl-x(L) and Mcl-1. These findings demonstrate that Src-activated Stat3 signaling is important for the growth and survival of melanoma tumor cells. |
| Databáze: | OpenAIRE |
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