Abstract
Src is a non-receptor protein tyrosine kinase, the expression and activity of which is increased in >80% of human colon cancers with respect to normal colonic epithelium. Previous studies from this and other laboratories have demonstrated that Src activity contributes to tumorigenicity of established colon adenocarcinoma cell lines. Src participates in the regulation of many signal transduction pathways, among which are those leading to cellular survival. In this study, we addressed the potential role of Src activation to a specific aspect of tumor cell survival, resistance to detachment-induced apoptosis (anoikis). Using five colon tumor cell lines with different biologic properties and genetic alterations, we demonstrate that expression and activity of Src corresponds with resistance to anoikis. Enforced expression of activated Src in subclones of SW480 cells (of low intrinsic Src expression and activity) increases resistance to anoikis; whereas decreased Src expression in HT29 cells (of high Src expression and activity) by transfection with anti-sense Src expression vectors increases susceptibility to anoikis. In contrast, increasing or decreasing Src expression had no effect on susceptibility to staurosporine-induced apoptosis in attached cells. PD173955, a Src family-specific tyrosine kinase inhibitor, increases the susceptibility of HT29 cells to anoikis in a dose- and time-dependent manner. Increasing Src expression and activity led to increased phosphorylation of Akt, a mediator of cellular survival pathways, whereas decreasing Src activity led to decreased Akt phosphorylation. In colon tumor cells with high Src activity, the PI3 kinase inhibitor LY 294002 sensitized cells to anoikis. These results suggest that Src activation may contribute to colon tumor progression and metastasis in part by activating Akt-mediated survival pathways that decrease sensitivity of detached cells to anoikis.
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Acknowledgements
We would like to thank Karen Ramirez and Kayo Nakano for their technical expertise in the cell cycle and immunoblotting analyses, respectively. This work was supported by CA53617, CA65527 and The Gillson Longenbaugh Foundation (GE Gallick), T32CA09599 (TC Windham) grants from the NIH, and by the American Cancer Society, Texas Branch (TC Windham).
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Windham, T., Parikh, N., Siwak, D. et al. Src activation regulates anoikis in human colon tumor cell lines. Oncogene 21, 7797–7807 (2002). https://doi.org/10.1038/sj.onc.1205989
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DOI: https://doi.org/10.1038/sj.onc.1205989
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