TGF-β (transforming growth factor-β) induces a cytostatic response in most normal cell types. In cancer cells, however, it often promotes metastasis, and its high expression is correlated with poor prognosis. In the present study, we show that S100A4, a metastasis-associated protein, also called metastatin-1, can physically and functionally interact with Smad3, an important mediator of TGF-β signalling. In agreement with its known property, S100A4 binds to Smad3 in a Ca2+-dependent manner. The S100A4-binding site is located in the N-terminal region of Smad3. S100A4 can potentiate transcriptional activity of Smad3 and the related Smad2. When exogenously expressed in MCF10CA1a.cl1, an MCF10-derived breast cancer cell line, S100A4 increases TGF-β-induced MMP-9 (matrix metalloproteinase-9) expression. On the other hand, depletion of S100A4 by siRNA (small interfering RNA) from the MDA-MB231 cell line results in attenuation of MMP-9 induction by TGF-β. Consistent with these observations, S100A4 increases cell invasion ability induced by TGF-β in MCF10CA1a.cl1 cells, and depletion of the protein in MDA-MB-231 cells inhibits it. Because expression of both S100A4 and TGF-β is highly elevated in many types of malignant tumours, S100A4 and Smad3 may co-operatively increase metastatic activity of some types of cancer cells.
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Research Article|
February 24 2010
Functional interaction between Smad3 and S100A4 (metastatin-1) for TGF-β-mediated cancer cell invasiveness
Isao Matsuura;
Isao Matsuura
1
1Division of Molecular and Genomic Medicine, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 35053, Taiwan
1To whom correspondence should be addressed (email imatsuura@nhri.org.tw).
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Chen-Yu Lai;
Chen-Yu Lai
1Division of Molecular and Genomic Medicine, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 35053, Taiwan
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Keng-Nan Chiang
Keng-Nan Chiang
1Division of Molecular and Genomic Medicine, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 35053, Taiwan
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Publisher: Portland Press Ltd
Received:
July 01 2009
Revision Received:
December 10 2009
Accepted:
January 13 2010
Accepted Manuscript online:
January 13 2010
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© The Authors Journal compilation © 2010 Biochemical Society
2010
Biochem J (2010) 426 (3): 327–335.
Article history
Received:
July 01 2009
Revision Received:
December 10 2009
Accepted:
January 13 2010
Accepted Manuscript online:
January 13 2010
Citation
Isao Matsuura, Chen-Yu Lai, Keng-Nan Chiang; Functional interaction between Smad3 and S100A4 (metastatin-1) for TGF-β-mediated cancer cell invasiveness. Biochem J 15 March 2010; 426 (3): 327–335. doi: https://doi.org/10.1042/BJ20090990
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