Protein Tyrosine Kinase 6 Protects Cells from Anoikis by Directly Phosphorylating Focal Adhesion Kinase and Activating AKT

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Protein Tyrosine Kinase 6 Protects Cells from Anoikis by Directly Phosphorylating Focal Adhesion Kinase and Activating AKT

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Title: Protein Tyrosine Kinase 6 Protects Cells from Anoikis by Directly Phosphorylating Focal Adhesion Kinase and Activating AKT
Author: Zheng, Yu; Gierut, Jessica; Wang, Zebin; Miao, Jianjun; Asara, John M.; Tyner, Angela L.

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Citation: Zheng, Yu, Jessica Gierut, Zebin Wang, Jianjun Miao, John M. Asara, and Angela L. Tyner. 2014. “Protein Tyrosine Kinase 6 Protects Cells from Anoikis by Directly Phosphorylating Focal Adhesion Kinase and Activating AKT.” Oncogene 32 (36): 4304-4312. doi:10.1038/onc.2012.427. http://dx.doi.org/10.1038/onc.2012.427.
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Abstract: Protein tyrosine kinase 6 (PTK6) is a non-receptor tyrosine kinase expressed in epithelial cancers. Disruption of Ptk6 decreases AOM-induced colon tumorigenesis in mice by preventing STAT3 activation. Relocalization of PTK6 in prostate cancers contributes to increased growth. Although not expressed in normal breast or ovary, PTK6 promotes anchorage-independent survival of breast and ovarian tumor cells. We identified several potential PTK6 substrates in the human SW620 colon cancer cell line using mass spectrometry, including FAK (focal adhesion kinase). We show that FAK is a direct substrate of PTK6 in vitro and in vivo. Expression of membrane targeted active PTK6 (Palm-PTK6-YF) induces constitutive activation of FAK and cell morphology changes, which are independent of SRC family kinases in Src−/−, Yes−/−, Fyn−/− (SYF) mouse embryonic fibroblasts (MEFs). Palm-PTK6-YF expressing SYF cells are transformed and overcome contact inhibition, form colonies in transformation assays, proliferate in suspension, and form tumors in a xenograft model. Expression of FAK and Palm-PTK6-YF in Fak−/− MEFs synergistically activates AKT and protects cells against anoikis. However, expression of Palm-PTK6-YF in Akt1/2−/− MEFs fails to protect cells from anoikis, indicating AKT is critical in PTK6 and FAK mediated survival signaling. In a conditional Pten knockout murine prostate cancer model, we identify prostate epithelial cells with enhanced activation of endogenous PTK6 and FAK at the plasma membrane. Knockdown of PTK6 in the PC3 human prostate cancer cell line disrupts FAK and AKT activation and promotes anoikis, which can be rescued by exogenous expression of FAK. Our data reveal important roles for a PTK6-FAK-AKT signaling axis in promoting anchorage-independent cell survival.
Published Version: doi:10.1038/onc.2012.427
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3940264/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12064550
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