Background/Aims: Nanog plays a key role in stem cell self-renewal and pluripotency differentiation in embryonic stem cells ( ESCs). Recently, some studies reported that abnormal expression of Nanog could be detected in several tumors, indicating that Nanog might be related to tumor development. However, studies on the correlation between Nanog expression and esophageal cancer are sparse. Methods: In this study, we established two esophageal cancer cell lines 9706-Nanog and 9706-shNanog which stably expressed Nanog and Nanog-short-hairpin RNA (shRNA) genes. Results: We found that Nanog expression could promote the proliferation and invasiveness of the cancer cells, and inhibit the apoptosis. We also treated 9706-Nanog, EC9706 and 9706-shNanog cell lines with cisplatin and evaluated the drug sensitivity of the three cell lines. We found that the sensitivity of cisplatin was decreased with increased expression of Nanog. The expression of MDR-1 was also increased in 9706Nanog cells. Conclusions: Nanog may play an important role in human esophageal cancer development, and could be used as a therapeutic target in esophageal cancer treatment.

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