MIR-27a regulates the TGF-β signaling pathway by targeting SMAD2 and SMAD4 in lung cancer

Dong Kyu Chae, Eunmi Ban, Young Sook Yoo, Eunice Eun Kyeong Kim, Ja Hyun Baik, Eun Joo Song

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53 Scopus citations


The transforming growth factor-β (TGF-β) signaling pathway is associated with carcinogenesis and various biological processes. SMAD2 and SMAD4, which are putative tumor suppressors, have an important role in TGF-β signaling. The aberrant expression of these genes is implicated in some cancers. However, the mechanisms of SMAD2 and SMAD4 dysregulation are poorly understood. In this study, we observed that miR-27a was upregulated in lung cancer cell lines and patients. In addition, SMAD2 and SMAD4 genes were identified as targets of miR-27a by several target prediction databases and experimental validation. Functional studies revealed that miR-27a overexpression decreased SMAD2 and SMAD4 mRNA and protein levels. Furthermore, miR-27a contributed to cell proliferation and invasion by inhibiting TGF-β-induced cell cycle arrest. These results suggest that miR-27a may function as an oncogene by regulating SMAD2 and SMAD4 in lung cancer. Thus, miR-27a may be a potential target for cancer therapy.

Original languageEnglish
Pages (from-to)1992-1998
Number of pages7
JournalMolecular Carcinogenesis
Issue number8
StatePublished - Aug 2017

Bibliographical note

Publisher Copyright:
© 2017 Wiley Periodicals, Inc.


  • SMAD2
  • SMAD4
  • TGF-β
  • lung cancer
  • miR-27a


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