miR-302b inhibits cancer-related inflammation by targeting ERBB4, IRF2 and CXCR4 in esophageal cancer
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Mingxin Zhang1,*, Lingmin Zhang2,*, Manli Cui1,*, Wenguang Ye1, Pengjiang Zhang3, Suna Zhou4 and Jingjie Wang1
1Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, Shaanxi Province, China
2Department of Anesthesiology, First Affiliated Hospital, Xi'an Jiaotong University, Xi’an 710061, Shaanxi Province, China
3Second Department of Cadre’s Ward, Lanzhou General Hospital of Chinese PLA, Lanzhou 730050, China
4Department of Radiotherapy, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, Shaanxi Province, China
*These authors contributed equally to this work
Jingjie Wang, email: firstname.lastname@example.org
Suna Zhou, email: email@example.com
Keywords: miR-302b, cancer related inflammation, esophageal cancer
Received: March 01, 2017 Accepted: April 04, 2017 Published: April 11, 2017
Cancer related inflammation (CRI) plays an important role in the development of esophageal cancer (EC), and the target gene analysis shows that miR-302b potential target genes closely correlated to CRI important signaling pathways. The present study was to evaluate the inhibition of miR-302b on CRI in EC and its mechanism. We found that the expression levels of miR-302b in EC cells were lower than that in Het-1A cells, while TE11 with the lowest expression and OE33 with the highest. Inflammatory stimuli at 48 h significantly reduced expression of miR-302b in EC cells, but had no effect in Het-1A. After up-regulation of miR-302b in TE11 and down-regulation of miR-302b in OE33, it was found that miR-302b reduced CRI key transcription factors and representative cytokines. Then, over-expressed of miR-302b significantly altered potential target genes protein expressions and there was a negative correlation between miR-302b and potential target genes protein expressions (ERBB4, IRF2 and CXCR4) in EC tissues. Then reporter gene analysis revealed that miR-302b post-transcriptionally regulated expression of target genes by specific area of 3′-UTR. Transfected by target genes shRNA plasmids together could get the same effects of miR-302b on protein expression of CRI key transcription factors. Furthermore, miR-302b was able to repress tumor growth and transcription factors protein expression in vivo. These finding suggests that miR-302b inhibits key transcription factors and cytokines by targeting ERBB4, IRF2 and CXCR4, implicating its role in the inhibition of CRI in EC.
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