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SRC kinase regulation in progressively invasive cancer
Weichen Xu1, Nancy Allbritton, David S Lawrence
1Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Plos One
|November 13, 2012
Summary
The study found that while total Src protein and its activity decrease in aggressive prostate cancer, its specific activity increases, indicating a complex role in metastasis. This suggests Src is primed for signaling in advanced cancers.
Area of Science:
- Biochemistry
- Oncology
- Cell Biology
Background:
- Metastatic progression is a complex process involving tumor growth, survival, motility, invasion, and proliferation.
- The Src protein tyrosine kinase is implicated in pathways driving these metastatic behaviors and its activity is noted in various cancers.
Purpose of the Study:
- To investigate Src kinase regulation at structural, enzymatic, and expression levels in progressively invasive prostate cancer cell lines.
- To understand the role of Src activity in the context of increasing metastatic potential.
Main Methods:
- Analysis of Src protein expression, total kinase activity, and specific activity in a panel of prostate cancer cell lines with varying invasiveness.
- Examination of Src phosphorylation at activation (Tyr-416) and inhibitory (Tyr-527) sites.
Main Results:
- Total Src content and kinase activity unexpectedly decreased with increasing cell line aggressiveness.
- Src kinase specific activity showed a direct correlation with metastatic aggressiveness.
- While Tyr-416 phosphorylation increased, unexpectedly high Tyr-527 phosphorylation was observed in aggressive cell lines.
Conclusions:
- Src's role in prostate cancer metastasis is complex, with specific activity, not total levels, correlating with aggressiveness.
- High Tyr-527 phosphorylation suggests Src is primed rather than inhibited in aggressive cell lines, ready to respond to binding partners.
- These findings offer insights into Src regulation and its potential as a biomarker in prostate cancer progression.
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