J Cancer 2019; 10(16):3698-3705. doi:10.7150/jca.32680 This issue

Research Paper

RMP promotes the proliferation and radioresistance of esophageal carcinoma

Shaomu Chen1,2,*, Yu Feng2,*, Biao Zhang2, Xiaochun Chen3, Wenxiang Wei1✉, Haitao Ma2✉

1. Department of Cell Biology, School of Medicine, Soochow University, Suzhou, Jiangsu, China
2. Department of Thoracic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
3. Department of Cardiothoracic surgery, Suzhou Science & Technology Town Hospital, Suzhou, Jiangsu, China
* These authors contributed equally to this work.

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Chen S, Feng Y, Zhang B, Chen X, Wei W, Ma H. RMP promotes the proliferation and radioresistance of esophageal carcinoma. J Cancer 2019; 10(16):3698-3705. doi:10.7150/jca.32680. Available from https://www.jcancer.org/v10p3698.htm

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RMP is a RNA polymerase II Subunit RPB-5 associated protein shown to act as an oncogene in several cancer. However, the mechanism of the involvement of RMP in esophageal cancer (EC) remains unclear. We analyzed RMP expression in EC cell lines and EC tissues. The connection between RMP and clinical pathological features of EC was also elucidated. To investigate the role of RMP in EC, We performed CCK-8 assay to evaluate cell proliferation, and Annexin V/PI double-staining to evaluate cell apoptosis. Effect of RMP on tumor progression in nude mouse models was assessed by measurement of volume and weight of tumors. Expression of RMP, CEA and CA199 in vivo were measured by Inmunohistochemical staining. First of all, our study showed that RMP was highly expressed in EC cell lines (compared with normal cells) and tumor tissues (compare with corresponding normal tissues). Then, we found that RMP was bound up with the status of nodal and T stage which indicating that RMP may be related to the growth and malignant degree of EC. Moreover upregulation of RMP could contribute to tumor growth in vitro and vivo. In addition, the results also showed that overexpression of RMP could significantly reduce the susceptibility to radiotherapy. Taken together, all these further suggested that RMP would play a chance-promoting in EC which may provide us a powerful goal for gene targeting treatment of esophageal cancer.

Keywords: RMP, EC, tumor growth, radiotherapy, gene targeting treatment