Volume 6 Issue 12
Dec.  2015
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Chuankai Zhang, Yunda Zhang, Weiji Ding, Yancheng Lin, Zhengjie Huang, Qi Luo. MiR-33a suppresses breast cancer cell proliferation and metastasis by targeting ADAM9 and ROS1[J]. Protein&Cell, 2015, 6(12): 881-889. doi: 10.1007/s13238-015-0223-8
Citation: Chuankai Zhang, Yunda Zhang, Weiji Ding, Yancheng Lin, Zhengjie Huang, Qi Luo. MiR-33a suppresses breast cancer cell proliferation and metastasis by targeting ADAM9 and ROS1[J]. Protein&Cell, 2015, 6(12): 881-889. doi: 10.1007/s13238-015-0223-8

MiR-33a suppresses breast cancer cell proliferation and metastasis by targeting ADAM9 and ROS1

doi: 10.1007/s13238-015-0223-8
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This study was supported by grants from the Medical Innovations Topic in Fujian Province (No. 2012-CXB-29), Key Project of Science and Technology Project of Fujian Province (No. 2014D017), Project of Xiamen Scientific and Technological Plan (No. 3502Z20134011), and Science and Technology Project of Natural Science Foundation of Fujian Province (No. 2015J01564).

  • Received Date: 2015-07-09
  • Rev Recd Date: 2015-09-07
  • MicroRNAs (miRNAs) are small noncoding RNAs that have a pivotal role in the post-transcriptional regulation of gene expression by sequence-specifically targeting multiple mRNAs. Although miR-33a was recently reported to play an important role in lipid homeostasis, atherosclerosis, and hepatic fibrosis, the functions of miR-33a in tumor progression and metastasis are largely unknown. Here, we found that downregulated miR-33a in breast cancer tissues correlates with lymph node metastasis. MiR-33a expression is significantly lower in the highly metastatic breast cancer cell lines than the noncancerous breast epithelial cells and non-metastatic breast cancer cells. Moreover, the overexpression of miR-33a in metastatic breast cancer cells remarkably decreases cell proliferation and invasion in vitro and significantly inhibits tumor growth and lung metastasis in vivo, whereas its knockdown in non-metastatic breast cancer cells significantly enhances cell proliferation and invasion in vitro and promotes tumor growth and lung metastasis in vivo. Combining bioinformatics prediction and biochemical analyses, we showed that ADAM9 and ROS1 are direct downstream targets of miR-33a. These findings identified miR-33a as a negative regulator of breast cancer cell proliferation and metastasis.
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