Abstract
Microenvironmental clues are critical to cell behavior. One of the key elements of migration is the generation and response to forces. Up to now, there is no definitive concept on how the generation and responses to cellular forces influence cancer-cell behavior. Here, we show that expression of receptor-type tyrosine-protein phosphatase alpha (RPTPα) in human SW480 colon cancer cells sets a threshold for the response to matrix forces by changing cellular contractility. This can be explained as an RPTPα-mediated increase in contractility with a consecutive increase in number and size of adhesion sites and stress fibers. These effects are mediated through myosin light chain kinase and largely independent of Rho/Rho-kinase (ROCK) signaling. In addition, we report that RPTPα influences spreading on low-rigidity surfaces, binding of collagen-coated beads and expression of RPTPα is required for invasion into the chorioallantoic membrane. These data suggest that force-responsive proteins such as RPTPα can influence cancer-cell behavior and identify potential targets for cancer therapy.
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Abbreviations
- CAM:
-
chorioallantoic membrane
- CSK:
-
C-terminal Src kinase
- ECM:
-
extracellular matrix
- FC:
-
focal contact
- GFP:
-
green fluorescent protein
- MLCK:
-
myosin light chain kinase
- MLC:
-
myosin light chain
- MYPT1:
-
myosin phosphatase target subunit isoform 1
- ROCK:
-
Rho kinase
- RPTPα:
-
receptor-type tyrosine-protein phosphatase alpha
- SFK:
-
Src family kinases
- TMA:
-
Tissue micro-array
- YFP:
-
yellow fluorescent protein
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Acknowledgements
This work was supported by the DFG to GvW and FO and the Deutsche Krebshilfe to GvW and TS.
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Krndija, D., Schmid, H., Eismann, JL. et al. Substrate stiffness and the receptor-type tyrosine-protein phosphatase alpha regulate spreading of colon cancer cells through cytoskeletal contractility. Oncogene 29, 2724–2738 (2010). https://doi.org/10.1038/onc.2010.25
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DOI: https://doi.org/10.1038/onc.2010.25
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