Journal
JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH
Volume 33, Issue -, Pages -Publisher
BMC
DOI: 10.1186/1756-9966-33-10
Keywords
miR-302b; ErbB4; Esophageal squamous cell carcinoma
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Funding
- National Natural Science Foundation of China [81302055]
- Program for Changjiang Scholars and Innovative Research Team in University [PCSIRT: 1171]
- Key Sci-tech Research Project 13115 of Shaanxi Province [2010ZDKG-50]
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Background: ErbB4 expression has been noted in various tumors, but its regulatory mechanism in esophageal squamous cell carcinoma (ESCC) remains unclear. The aim of this study was to investigate whether miR-302b regulates the expression of ErbB4 at the post-transcriptional level and to determine its expression, significance, and function in ESCC. Methods: We used real-time reverse transcriptase-polymerase chain reaction to quantify the expression of miR-302b in 50 ESCC tissues and analyzed its relationship with clinicopathological factors and survival. Then, we investigated the post-transcriptional regulation of ErbB4 expression using immunoblot analysis and luciferase reporter assays. Finally, the effects of miR-302b on proliferation, apoptosis, and invasion of ESCC cells was detected using MTT, flow cytometric analysis, and transwell invasion assays, respectively. Results: miR-302b was significantly down-regulated and correlated with tumor differentiation and lymph node metastasis in ESCC. Univariate and multivariate analyses indicated that low miR-302b expression might be a poor prognostic factor. Further studies demonstrated that miR-302b post-transcriptionally down-regulated the expression of ErbB4 in vitro. Moreover, miR-302b inhibited proliferation by inducing apoptosis and repressed invasion in the ESCC cell lines. Conclusions: miR-302b is a potential molecular marker of ESCC and functions as a tumor suppressor by post-transcriptionally regulating ErbB4.
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