Abstract
Metastasis begins with a subset of local tumor cells acquiring the potential to invade into surrounding tissues, and remains to be a major obstacle for cancer treatments. More than 90% of cancer patients died from tumor metastasis, instead of primary tumor growth. The canonical Wnt/β-catenin pathway plays essential roles in promoting tumor formation, yet its function in regulating tumor metastasis and the underlying mechanisms remain controversial. Here we employed well-established Drosophila tumor models to investigate the regulating mechanism of Wingless (Wg) pathway in tumor invasion. Our results showed that Wg signaling is necessary and sufficient for cell polarity disruption-induced cell migration and molecular changes reminiscent of epithelial-mesenchymal transition (EMT). Moreover, reducing Wg signaling suppressed lgl−/−/RasV12-induced tumor invasion, and cooperation between Arm and RasV12 is sufficient to induce tumor invasion. Mechanistically, we found that cell polarity disruption activates JNK signaling, which in turn upregulate wg expression through transcription factor activator protein-1 (AP-1). We identified a consensus AP-1 binding site located in the 2nd intron of wg, and confirmed that it is essential for AP-1 induced wg transcription both in vitro and in vivo. Lastly, we confirmed that the transcriptional activation of WNT by AP-1 is conserved in human cancer cells. These evidences reveal a positive role of Wnt/β-catenin pathway in tumor invasion, and provide a conserved mechanism that connects JNK and Wnt signaling in regulating tumor progression.
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Acknowledgements
We thank Bloomington Drosophila Stock Center, Vienna Drosophila RNAi Center, Fly Stocks of National Institute of Genetics, the Core Facility of Drosophila Resource and Technology at SIBCB of CAS, Developmental Studies Hybridoma Bank, Dr. Jose´ Carlos Pastor-Pareja and Dr. Haiyun Song for fly stocks and antibodies. We thank Drs. Zhihua Liu, Ru Zhang, Fan Zhang and Jian Fei for cell lines and plasmids. We thank Dr. Mark Peifer and other lab members for discussion and critical comments. This work is founded by National Natural Science Foundation of China (31571516, 31701278 and 31771595), and Shanghai Committee of Science and Technology (18430711600, 18140900400, 09DZ2260100).
Author contributions
Shiping Zhang, Xiaowei Guo and Lei Xue conceived the study. Shiping Zhang, Xiaowei Guo, Honggui Wu, Ying Sun, Xianjue Ma, Jikai Li, Chenxi Wu and Qiwen Li performed all the experiments. Shiping Zhang, Xiaowei Guo, Cizhong Jiang, Wenzhe Li, Margaret S. Ho, Zhongwei Lv and Lei Xue analyzed the data. Ying Sun and Qian Xu helped design and analyze the statistics. Shiping Zhang, Xiaowei Guo and Lei Xue wrote the manuscript, and all authors approved the final version.
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Zhang, S., Guo, X., Wu, H. et al. Wingless modulates activator protein-1-mediated tumor invasion. Oncogene 38, 3871–3885 (2019). https://doi.org/10.1038/s41388-018-0629-x
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DOI: https://doi.org/10.1038/s41388-018-0629-x
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