期刊
CANCER LETTERS
卷 449, 期 -, 页码 76-86出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2019.02.020
关键词
TOX3; Clear cell renal cell carcinoma (ccRCC); Migration; Invasion; Transcriptional regulation
类别
资金
- National Natural Science Foundation of China [81502203, 81772710, 81802535]
- National Natural Science Foundation of Jiangsu Province [BK20150097]
- Project of Invigorating Health Care through Science, Technology and Education Jiangsu Provincial Key Medical Discipline [ZDXKB2016014]
- Summit of the Six Top Talents Program of Jiangsu Province [SWYY-084]
- Postdoctoral Scientific Research Project of China [2017M621729]
- Postdoctoral Research Foundation of Jiangsu Province [1701021B]
- Nanjing Medical Science and technique Development Foundation [QRX17139]
Studies on the mechanism of clear cell renal cell carcinoma (ccRCC) progression are lacking. In this study, TOX3 was identified as a novel cancer suppressor gene in ccRCC. Hypermethylation of CpG probes in the promoter region was associated with the functional loss of TOX3 in ccRCC cancer tissues. Downregulation of TOX3 mRNA was strongly associated with poor clinical outcomes in ccRCC. Immunohistochemistry confirmed TOX3 was downregulated in primary tumors without metastasis (n = 126) and further downregulated in primary metastatic tumors (n = 23) compared with adjacent noncancerous tissues (n = 92). In vitro, overexpression of TOX3 inhibited RCC cell growth, migration and invasion. Mechanistic investigations showed that TOX3 deficiency facilitates the epithelial-mesenchymal transition due to impairment of transcriptional repression of SNAIL members SNAI1 and SNAI2 and promotes cancer cell migration and invasion. In vivo, restoring TOX3 expression reduced lung metastatic lesions and prolonged survival of mice. TOX3 combined with SNAIl or SNAI2 predicted overall survival in ccRCC patients. Blockage of this pathway could be a promising therapeutic target for advanced ccRCC.
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