Abstract
Purpose
Invasion of cancer cells depends on the proteolytic degradation of extracellular matrix regulated by actin-driven membrane protrusions, called invadopodia. However, the mechanisms underlying invadopodia formation in cancer cells remain largely unknown.
Methods
By employing adenoviral transduction of breast cancer cells with either β-galactosidase (Ad-LacZ) or TIS21/BTG2/Pc3 (Ad-TIS21) gene, the regulation of invadopodia formation was investigated. Invasion activity was examined by invadopodia assay and Matrigel assay. Intracellular reactive oxygen species (ROS) was monitored by FACS-based analysis.
Results
Here, we observed that TIS21 suppressed invadopodia formation as well as invasion activity along with F-actin remodeling. The inhibition of TIS21-mediated invadopodia formation was accompanied with attenuation of ROS generation in the TIS21 expressers, indicating that TIS21-mediated inhibition of ROS plays a critical role for invadopodia formation by regulating actin-associated protein remodeling. This was further confirmed in the TIS21−/−MEF cells.
Conclusions
This is the first report to provide insight into invasion signals regulated by tumor suppressor, TIS21/BTG2/Pc3 gene, in the intractable breast cancer cells.
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Abbreviations
- ROS:
-
Reactive oxygen species
- MEF:
-
Mouse embryonic fibroblast
- NAC:
-
N-acetyl-l-cysteine
- FBS:
-
Fetal bovine serum
- ECM:
-
Extracellular matrix
- TIS21:
-
12-O-tetradecanoylphorbol-13-acetate-inducible sequence 21
- BTG2:
-
B-cell translocation gene 2
- Ad-TIS21:
-
Adenovirus carrying TIS21 cDNA
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
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Acknowledgments
Authors greatly appreciate careful reading of this manuscript by Prof. Woon Ki Paik in Ajou University School of Medicine. This work was supported by the grants of the Korea Health Technology R&D Project, Ministry of Health and Welfare, Republic of Korea (A121725) and the National R&D Program for Cancer Control, Ministry for Health and Welfare, Republic of Korea (131280).
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Choi, JA., Lim, I.K. TIS21/BTG2 inhibits invadopodia formation by downregulating reactive oxygen species level in MDA-MB-231 cells. J Cancer Res Clin Oncol 139, 1657–1665 (2013). https://doi.org/10.1007/s00432-013-1484-3
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DOI: https://doi.org/10.1007/s00432-013-1484-3