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Activation of STAT transcription factors in oncogenic tyrosine kinase signaling
1H. Lee Moffitt Cancer Center and Research Institute, Department of Biochemistry and Molecular Biology, University of South Florida College of Medicine, Tampa 33612, USA.
Abstract:
Signal transducers and activators of transcription (STATs) are cytoplasmic transcription factors that translocate to the nucleus and regulate gene expression in response to cytokine and growth factor stimulation. Emerging evidence indicates that STAT signaling is also frequently activated by oncogenes and in tumor cells. Constitutive activation of STAT proteins has been reported in cell lines stably transformed by diverse oncoproteins that directly or indirectly activate specific tyrosine kinase signaling pathways. In addition, STAT activation has been detected in a variety of human tumors and tumor cell lines, many of which are known to harbor activated tyrosine kinases. Recent findings support a model in which activation of STAT signaling in the context of oncogenesis induces gene expression that participates in malignant transformation.
Insights
Signal transducers and activators of transcription (STATs) are key in gene regulation. STAT signaling activation by oncogenes in tumor cells contributes to malignant transformation and cancer development.
Area of Science:
- Molecular Biology
- Cellular Biology
- Oncology
Background:
- Signal transducers and activators of transcription (STATs) are cytoplasmic transcription factors.
- STATs regulate gene expression in response to cytokine and growth factor stimulation.
- STAT signaling is increasingly recognized as activated by oncogenes and in tumor cells.
Purpose of the Study:
- To investigate the role of STAT signaling in oncogenesis.
- To understand how STAT activation contributes to malignant transformation.
Main Methods:
- Analysis of STAT protein activation in cancer cell lines.
- Investigation of STAT signaling pathways activated by oncoproteins.
- Detection of STAT activation in human tumors.
Main Results:
- Constitutive STAT activation is observed in cell lines transformed by oncoproteins.
- STAT activation is detected in various human tumors and cell lines, often associated with activated tyrosine kinases.
- STAT signaling activation in oncogenesis induces gene expression involved in malignant transformation.
Conclusions:
- STAT signaling plays a significant role in cancer development.
- Targeting STAT pathways could be a potential therapeutic strategy for cancer treatment.