Abstract
Background
Reversion-inducing-cysteine-rich protein with Kazal motifs (RECK) has been implicated in the attenuation of tumor metastasis by negatively regulating metalloproteinase (MMP) levels. RECK gene expression is downregulated in many solid tumors, with this downregulation being associated with poor prognosis. This study evaluated the role of RECK in cholangiocarcinoma (CCA).
Methods
The expression of RECK, MMP-2, and MMP-9 in paraffin sections of hamster and human CCA specimens was analyzed by immunohistochemistry. Functional analysis of RECK was performed in RECK small interfering (si) RNA knockdown CCA cell lines. The effect of aspirin on RECK status and function was evaluated using Western blotting, gelatin zymography, invasion and proliferation assays, and PhosphoELISArray analysis of Ras downstream mediators.
Results
Hamster tissues showed high RECK expression in hyperplastic biliary duct epithelia, low RECK expression in precancerous lesions, and no RECK expression in CCA. In human specimens, RECK was highly expressed in normal biliary cells, whereas intrahepatic CCA showed low levels of expression. Downregulation of RECK was correlated with tumor metastasis (P < 0.01) and shorter patient survival (P < 0.02). RECK expression levels were inversely correlated with MMP-2 and MMP-9 expression (P < 0.05). SiRNA RECK-depleted M139 CCA cells exhibited increased MMP-2/-9 gelatinase activities and invasiveness. Aspirin (500 μM) demonstrated myriad effects in human CCA cell lines, including growth suppression, reduced phosphorylation of Akt/Erk/c-Jun, elevation of RECK expression, inhibition of MMP-2/MMP-9 activity, and enhanced invasiveness.
Conclusions
RECK functions as a metastasis suppressor in CCA; upregulation of RECK expression could provide a potential therapy to improve the prognosis of this type of cancer.
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Acknowledgments
We would like to thank the Liver Fluke and Cholangiocarcinoma Research Center for its support by a grant fund for the MS.c program, to J.P. This project was co-supported by a Mid-Career Grant (RSA5280007), Thailand Research Fund, to N.N.; and by an Invitation Research grant by the Faculty of Medicine (I52111) to J.P., Khon Kaen University, Thailand. We thank Professor Naoya Kobayashi (Okayama University, Japan), who kindly supplied the human MMNK1 cell line; and we thank the National Cancer Center of Singapore for kindly supplying the HucCT1 and EGI-1 cell lines used for this study. The content of this manuscript was edited and commented upon by Professor Prapon Wilairat, Mahidol University, Thailand. The English editing of this manuscript was kindly performed by Dr. Rahul Kuver, University of Washington, Seattle, WA, USA.
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Namwat, N., Puetkasichonpasutha, J., Loilome, W. et al. Downregulation of reversion-inducing-cysteine-rich protein with Kazal motifs (RECK) is associated with enhanced expression of matrix metalloproteinases and cholangiocarcinoma metastases. J Gastroenterol 46, 664–675 (2011). https://doi.org/10.1007/s00535-010-0345-y
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DOI: https://doi.org/10.1007/s00535-010-0345-y