Halofuginone inhibits radiotherapy-induced epithelial-mesenchymal transition in lung cancer
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Yang Chen1,*, Weishuai Liu2,*, Peng Wang3, Hailing Hou1, Ningbo Liu1, Linlin Gong1, Youyou Wang1, Kai Ji2, Lujun Zhao1, Ping Wang1
1Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China
2Department of Pain Management, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research, Center of Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China
3Department of Radiation Oncology, Peking University International Hospital, Beijing 102206, China
*These authors have contributed equally to this work
Lujun Zhao, email: email@example.com
Keywords: epithelial-mesenchymal transition (EMT), halofuginone, transforming growth factor-β (TGF-β1), radiotherapy, lung cancer
Received: April 09, 2016 Accepted: July 27, 2016 Published: August 11, 2016
Radiotherapy is used to treat many different human tumors. Paradoxically, radiation can activate TGF-β1 signaling and induce the epithelial-mesenchymal transition (EMT), which is associated with enhanced tumor progression. This study investigated the inhibitory effects of halofuginone, a plant-derived alkaloid that has been shown to inhibit TGF-β1 signaling, on radiation-induced EMT and explored the underlying mechanisms using a Lewis lung carcinoma (LLC) xenograft model. The cells and animals were divided into five treatment groups: Normal Control (NC), Halofuginone alone (HF), Radiotherapy alone (RT), Radiotherapy combined with Halofuginone (RT+HF), and Radiotherapy combined with the TGF-β1 inhibitor SB431542 (RT+SB). Radiation induced EMT in lung cancer cells and xenografts, as evidenced by increased expression of the mesenchymal markers N-cadherin and Vimentin, and reduced expression of the epithelial markers E-cadherin and Cytokeratin. Further, radiotherapy treatment increased the migration and invasion of LLC cells. Halofuginone reversed the EMT induced by radiotherapy in vitro and in vivo, and inhibited the migration and invasion of LLC cells. In addition, TGF-β1/Smad signaling was activated by radiotherapy and the mRNA expression of Twist and Snail was elevated; this effect was reversed by halofuginone or the TGF-β1 inhibitor SB431542. Our results demonstrate that halofuginone inhibits radiation-induced EMT, and suggest that suppression of TGF-β1 signaling may be responsible for this effect.
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