Functional analyses of microRNA-326 in breast cancer development

Biosci Rep. 2019 Jul 29;39(7):BSR20190787. doi: 10.1042/BSR20190787. Print 2019 Jul 31.


MicroRNA-326 (miR-326) was reported to be dysregulated and involved in the progression of multiple cancers. However, the clinical significance, biological role and underlying mechanism of miR-326 in the carcinogenesis of breast cancer are still unclear. In the present study, we showed that miR-326 was down-regulated in human breast cancer tissues and cell lines. Our results also revealed that miR-326 overexpression significantly suppressed breast cancer cell proliferation, migration and invasion, and induced cell cycle arrest at G1/G0 phase. Furthermore, Sex determining region Y-box (SOX) protein 12 (SOX12), a known oncogene, was identified as a direct target of miR-326 by luciferase reporter assay. Moreover, miR-326 expression was inversely correlated with SOX12 mRNA expression levels in human breast cancer specimens. Overexpression of SOX12 partially rescued the inhibitory effect on cell proliferation, migration and invasion in breast cancer cells caused by miR-326 overexpression. These findings suggested that miR-326 might play a suppressive role in breast cancer, at least in part, by targeting SOX12, rendering miR-326 a promising therapeutic target for breast cancer.

Keywords: Breast cancer; SOX12; invasion; miR-326; proliferation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Breast Neoplasms / genetics
  • Breast Neoplasms / metabolism*
  • Breast Neoplasms / pathology
  • Female
  • G1 Phase Cell Cycle Checkpoints*
  • Humans
  • MCF-7 Cells
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Neoplasm Proteins / genetics
  • Neoplasm Proteins / metabolism
  • RNA, Neoplasm / genetics
  • RNA, Neoplasm / metabolism*
  • Resting Phase, Cell Cycle*
  • SOXC Transcription Factors / genetics
  • SOXC Transcription Factors / metabolism


  • MIRN326 microRNA, human
  • MicroRNAs
  • Neoplasm Proteins
  • RNA, Neoplasm
  • SOX12 protein, human
  • SOXC Transcription Factors