Constitutive activated STAT3 is an essential regulator and therapeutic target in esophageal squamous cell carcinoma
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Fang Tian1,2, Xiawen Yang4, Ying Liu1,2, Xiao Yuan3, Tianli Fan1,2, Fanmiao Zhang3, Jimin Zhao1,2, Jing Lu1,2, Yanan Jiang1,2, Ziming Dong1,2 and Yili Yang3
1Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, P. R. China
2Henan Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou, Henan, P. R. China
3Suzhou Institute of Systems Medicine, Center for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, Jiangsu, P. R. China
4Division of Molecular Signaling, Department of Advanced Biomedical Research, University of Yamanashi, Yamanashi, Japan
Fang Tian, email: email@example.com
Yili Yang, email: firstname.lastname@example.org
Keywords: esophageal squamous cell carcinoma, STAT3, apoptosis, patient-derived xenograft, targeting therapy
Received: March 14, 2017 Accepted: August 07, 2017 Published: September 12, 2017
Esophageal carcinoma is among the most common cancers worldwide and a leading cause of cancer death . Large numbers of studies indicated that chronic inflammation is closely associated with its development [21, 25]. Furthermore, the JAK/STAT pathway, which plays a critical role in inflammation and immunity, has been implied in a number of malignancies . It has been shown that targeting the pathway affected the growth, apoptosis, and metastasis of cultured esophageal squamous cell carcinoma cells . We found in the present study that STAT3 is constitutively activated in a subgroup of esophageal squamous cell carcinoma cell lines and primary tumors. Altered expressions of STAT3 target genes were found in these tumors by using RNAseq and qPCR analysis. Cytokines that activate STAT3 affected the expression of STAT3 target genes and promoted the growth of the ESCC cells, which could be blocked by STAT3 inhibitor and specific siRNA. Inhibition of STAT3 also suppressed the growth and colony formation, and induced apoptosis in the esophageal squamous cell carcinoma cells containing constitutively activated STAT3. Furthermore, the STAT3 inhibitor effectively blocked the growth of patient-derived tumor xenografts that harbored phosphorylated STAT3, but acted less effective on the xenografts derived from primary tumors that contained low levels of activated STAT3. These results indicated that activated STAT3 plays a critical role in the survival and growth of a subgroup of esophageal squamous cell carcinoma, and may serve as a target for precision therapeutic intervention.
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