MiR-520h is crucial for DAPK2 regulation and breast cancer progression

Chih-Ming Su, M. Y. Wang, Charlie Hong, Hsin-An Chen, Y. H. Su, Chih-Hsiung Wu, Ming-Te Huang, Yi Wen Chang, Shih Sheng Jiang, Shian-Ying Sung, Jang Yang Chang, Li Tzong Chen, Pai Sheng Chen, Jen Liang Su

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


MicroRNAs (miRNAs) are small RNAs that suppress gene expression by their interaction with 3'untranslated region of specific target mRNAs. Although the dysregulation of miRNAs has been identified in human cancer, only a few of these miRNAs have been functionally documented in breast cancer. Thus, defining the important miRNA and functional target involved in chemoresistance is an urgent need for human breast cancer treatment. In this study, we, for the first time, identified a key role of miRNA 520h (miR-520h) in drug resistance. Through protecting cells from paclitaxel-induced apoptosis, expression of miR-520h promoted the drug resistance of human breast cancer cells. Bioinformatics prediction, compensatory mutation and functional validation further confirmed the essential role of miR-520h-suppressed Death-associated protein kinase 2 (DAPK2) expression, as restoring DAPK2 abolished miR-520h-promoted drug resistance, and knockdown of DAPK2 mitigated cell death caused by the depletion of miR-520h. Furthermore, we observed that higher level of miR-520h is associated with poor prognosis and lymph node metastasis in human breast cancer patients. These results show that miR-520h is not only an independent prognostic factor, but is also a potential functional target for future applications in cancer therapeutics.

Original languageEnglish
Pages (from-to)1134-1142
Number of pages9
Issue number9
Publication statusPublished - Mar 3 2016

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research


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