MiR-630 suppresses breast cancer progression by targeting metadherin

// Ci-Xiang Zhou 1, * , Chen-Long Wang 1, * , An-Lu Yu 1 , Qiu-Yu Wang 1 , Meng-Na Zhan 1 , Jun Tang 2 , Xiu-Feng Gong 1 , Qian-Qian Yin 1 , Ming He 1 , Jian-Rong He 3 , Guo-Qiang Chen 1, 2 , Qian Zhao 1 1 Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of National Ministry of Education, Shanghai Jiao Tong University School of Medicine (SJTU-SM), Shanghai 200025, China 2 Institute of Health Sciences, SJTU-SM & Shanghai Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS), Shanghai 200025, China 3 Department of General Surgery, Rui-Jin Hospital, SJTU-SM, Shanghai 200025, China * These authors have contributed equally to this work Correspondence to: Qian Zhao, e-mail: qzhao@shsmu.edu.cn Guo-Qiang Chen, e-mail: chengq@shsmu.edu.cn Keywords: miR-630, MTDH, metastasis, breast cancer Received: May 29, 2015 Accepted: November 06, 2015 Published: November 16, 2015 ABSTRACT MicroRNAs have been integrated into tumorigenic programs as either oncogenes or tumor suppressor genes. The miR-630 was reported to be deregulated and involved in tumor progression of several human malignancies. However, its expression regulation shows diversity in different kinds of cancers and its potential roles remain greatly elusive. Herein, we demonstrate that miR-630 is significantly suppressed in human breast cancer specimens, as well as in various breast cancer cell lines. In aggressive MDA-MB-231-luc and BT549 breast cancer cells, ectopic expression of miR-630 strongly inhibits cell motility and invasive capacity in vitro . Moreover, lentivirus delivered miR-630 bestows MDA-MB-231-luc cells with the ability to suppress cell colony formation in vitro and pulmonary metastasis in vivo . Further studies identify metadherin (MTDH) as a direct target gene of miR-630. Functional studies shows that MTDH contributes to miR-630-endowed effects including cell migration and invasion as well as colony formation in vitro . Taken together, these findings highlight an important role for miR-630 in the regulation of metastatic potential of breast cancer and suggest a potential application of miR-630 in breast cancer treatment.