Abstract
The long non-coding RNA, HOTTIP, has an important role in tumorigenesis. It is known that HOTTIP regulates HOX gene family; however, its regulatory mechanism in esophageal squamous cell carcinoma (ESCC) remains elusive. In this study, we investigated the role of HOTTIP in ESCC and observed that HOTTIP/HOXA13 was upregulated in ESCC and promoted cell proliferation and metastasis in vivo and in vitro. Interestingly, harboring a miR-30b-binding site, HOTTIP as a molecular sponge mainly regulated miR-30b level in the nucleus and modulated the repression of HOXA13 mediated by miR-30b in the cytoplasm, resulting in the positive HOTTIP/HOXA13 correlation. In addition, HOTTIP upregulated snail1 by competitively binding miR-30b, subsequently promoting epithelial–mesenchymal transition (EMT) and invasion. HOTTIP directly bound the adaptor protein WDR5 and drove histone H3 lysine 4 trimethylation and HOXA13 gene transcription in ESCC cells. In conclusion, our findings indicated that HOTTIP modulated HOXA13 at both the transcriptional and posttranscriptional levels in ESCC cells and HOTTIP–miR-30b–HOXA13 axis may serve as potential diagnostic markers or drug targets for ESCC therapies.
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Abbreviations
- ESCC:
-
esophageal squamous cell carcinoma
- lncRNA:
-
long non-coding RNA
- EMT:
-
epithelial–mesenchymal transition.
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Acknowledgements
We are very grateful to Nanjing General Hospital for providing ESCC tissues and Professor Yifeng Zhou who provided ESCC cell lines. This work was supported by Project Program of State Key Laboratory of Natural Medicines in China (no. SKLNMBZ201403); National Science and Technology Major Projects of New Drugs in China (2012ZX09103301-004 and 2014ZX09508007); National Natural Science Foundation of China (30873073); the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); the Central University Basic Scientific Research Business Expenses (2016ZPY009). We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of the manuscript.
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Lin, C., Wang, Y., Wang, Y. et al. Transcriptional and posttranscriptional regulation of HOXA13 by lncRNA HOTTIP facilitates tumorigenesis and metastasis in esophageal squamous carcinoma cells. Oncogene 36, 5392–5406 (2017). https://doi.org/10.1038/onc.2017.133
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DOI: https://doi.org/10.1038/onc.2017.133
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