ATF3 functions as a novel tumor suppressor with prognostic significance in esophageal squamous cell carcinoma
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1 Key Laboratory of Molecular Biology in High Cancer Incidence Coastal Chaoshan Area of Guangdong Higher Education Institutes, Medical College of Shantou University, Shantou 515041, P. R. China
2 Department of Biochemistry and Molecular Biology, Medical College of Shantou University, Shantou 515041, P. R. China
3 Department of Experimental Animal Center, Medical College of Shantou University, Shantou 515041, P. R. China
4 Institute of Oncologic Pathology, Medical College of Shantou University, Shantou 515041, P. R. China
5 Department of Pathology, Shantou Central Hospital, Affiliated Shantou Hospital of Sun Yat-Sen University, Shantou 515041, P. R. China
6 Department of Oncologic Surgery, Shantou Central Hospital, Affiliated Shantou Hospital of Sun Yat-Sen University, Shantou 515041, P. R. China
Dr. En-Min Li, email: firstname.lastname@example.org
Dr. Li-Yan Xu, email: email@example.com
Keywords: ATF3; independent prognostic factor; cell invasion and metastasis; MMP-2; esophageal squamous cell carcinoma
Received: April 14, 2014 Accepted: August 06, 2014 Published: August 10, 2014
ATF3 was a transcription factor involved in the progression of certain cancers. Here, we sought to explore the expression and biological function of ATF3 in esophageal squamous cell carcinomas (ESCC). The prognostic significance of ATF3 expression was evaluated in 150 ESCC samples and 21 normal squamous cell epithelium tissues. Results showed that ATF3 was down-regulated in ESCC lesions compared with paired non-cancerous tissues and low tumorous ATF3 expression significantly correlated with shorter overall survival (OS) and disease-free survival (DFS). Cox regression analysis confirmed that ATF3 expression was an independent prognostic factor. Experimentally, forced expression of ATF3 led to decreased growth and invasion properties of ESCC cells in vitro and in vivo, whereas knockdown of ATF3 did the opposite. Furthermore, ATF3 upregulated the expression of MDM2 by increasing the nuclear translocation of P53 and formed an ATF3/MDM2/MMP-2 complex that facilitated MMP-2 degradation, which subsequently led to inhibition of cell invasion. Finally, we showed that Cisplatin could restrain the invasion of ESCC cells by inducing the expression of ATF3 via P53 signaling. Combined, our findings highlight a suppressed role for ATF3 in ESCC and targeting ATF3 might be a potential therapeutic strategy.
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