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Protooncogene-encoded protein kinases in interleukin-2 signal transduction
J C Reed1, T Torigoe, B C Turner
1La Jolla Cancer Research Foundation, CA 92037.
Abstract:
Protooncogenes are the normal forms of cellular genes that when altered in their expression or coding sequences can contribute to neoplastic transformation. As these genes often are important for normal cellular growth control, we explored the possibility that protein kinases encoded by particular protooncogenes could participate in signal transduction pathways regulated by the T cell growth factor, interleukin-2 (IL-2). In this review we summarize our findings to date regarding Raf-1, a serine/threonine-specific kinase that becomes phosphorylated on tyrosine residues and enzymatically activated in response to IL-2 stimulation. In addition, we describe our investigations of Lck and Lyn, two closely related protein tyrosine kinases of the src gene family that physically associate with the IL-2 receptor complex and whose activities are regulated by IL-2 in at least some T cells and B cells, respectively.
Insights
This study explores how protooncogenes, like Raf-1, Lck, and Lyn, are involved in cell growth signaling pathways regulated by interleukin-2 (IL-2). These protein kinases are activated by IL-2, influencing cell growth and transformation.
Area of Science:
- Molecular Biology
- Cell Signaling
- Oncology
Background:
- Protooncogenes regulate normal cellular growth.
- Alterations in protooncogenes can lead to neoplastic transformation.
- Interleukin-2 (IL-2) is a key T cell growth factor.
Purpose of the Study:
- To investigate the role of protooncogene-encoded protein kinases in IL-2-regulated signal transduction pathways.
- To explore the activation mechanisms of specific kinases by IL-2.
Main Methods:
- Review of findings on Raf-1, a serine/threonine-specific kinase.
- Investigation of Lck and Lyn, src gene family tyrosine kinases.
- Analysis of physical association with the IL-2 receptor complex.
Main Results:
- Raf-1 kinase is phosphorylated on tyrosine residues and activated by IL-2.
- Lck and Lyn protein tyrosine kinases associate with the IL-2 receptor complex.
- IL-2 regulates the activity of Lck in T cells and Lyn in B cells.
Conclusions:
- Specific protooncogene-encoded protein kinases are integral components of IL-2 signal transduction.
- These kinases play critical roles in IL-2-mediated cellular responses, including growth and activation.
- Understanding these pathways is crucial for comprehending neoplastic transformation.