BMP-7 blocks the effects of TGF-β-induced EMT in cholangiocarcinoma
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Epithelial–mesenchymal transition (EMT) is characterized by the loss of epithelial markers and the gain of mesenchymal markers. EMT is believed to be a major mechanism supporting cancer cell metastasis. The activation of EMT can be induced by various types of inflammatory cytokines including transforming growth factor β (TGF-β) whereas bone morphogenetic protein-7 (BMP-7) can inhibit this process. In this study, the up-regulation of Twist transcription factor and N-cadherin, mesenchymal marker in CCA tissues, has been demonstrated and it has been found that the high expression of Twist was significantly associated with poor prognosis of CCA patients (P = 0.010). Moreover, CCA samples showing Twist nuclear expression were significantly correlated with the up-regulation of N-cadherin (P = 0.024). These results also showed that the inflammatory mediator TGF-β induces CCA cell migration, one of the metastatic processes possibly via stimulation of Twist, N-cadherin and vimentin expression. Additionally, it has been shown that BMP-7 inhibits TGF-β-induced CCA cell migration, through inhibition of TGF-β-mediated Twist and N-cadherin expressions. These data reinforce the rationale to use BMP-7 as an EMT inhibitor to suppress the progression of CCA and might be a therapeutic approach to improve efficiency for CCA treatment.
KeywordsTwist N-cadherin Metastasis Epithelial–mesenchymal transition BMP-7 Cholangiocarcinoma
This work was supported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Health Cluster (SHeP-GMS), Khon Kaen University, Khon Kaen University Research Fund to PY and KD (Grant No. M54206) and the grant of Faculty of Medicine to KD (Grant No. I 56316). We express our sincere thanks to Professor James A Will for checking scientific and English improvements.
Conflicts of interest
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