MiR-195 and miR-497 suppress tumorigenesis in lung cancer by inhibiting SMURF2-induced TGF-β receptor I ubiquitination

Dong Kyu Chae, Jinyoung Park, Moonsoo Cho, Eunmi Ban, Mihue Jang, Young Sook Yoo, Eunice Eun Kyeong Kim, Ja Hyun Baik, Eun Joo Song

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56 Scopus citations


SMURF2 is a member of the HECT family of E3 ubiquitin ligases that have important roles as a negative regulator of transforming growth factor-β (TGF-β) signaling through ubiquitin-mediated degradation of TGF-β receptor I. However, the regulatory mechanism of SMURF2 is largely unknown. In this study, we identified that micro(mi)R-195 and miR-497 putatively target SMURF2 using several target prediction databases. Both miR-195 and miR-497 bind to the 3′-UTR of the SMURF2 mRNA and inhibit SMURF2 expression. Furthermore, miR-195 and miR-497 regulate SMURF2-dependent TβRI ubiquitination and cause the activation of the TGF-β signaling pathway in lung cancer cells. Upregulation of miR-195 and miR-497 significantly reduced cell viability and colony formation through the activation of TGF-β signaling. Interestingly, miR-195 and miR-497 also reduced the invasion ability of lung cancer cells when cells were treated with TGF-β1. Subsequent in vivo studies in xenograft nude mice model revealed that miR-195 and miR-497 repress tumor growth. These findings demonstrate that miR-195 and miR-497 act as a tumor suppressor by suppressing ubiquitination-mediated degradation of TGF-β receptors through SMURF2, and suggest that miR-195 and miR-497 are potential therapeutic targets for lung cancer.

Original languageEnglish
Pages (from-to)2663-2678
Number of pages16
JournalMolecular Oncology
Issue number12
StatePublished - 1 Dec 2019

Bibliographical note

Publisher Copyright:
© 2019 The Authors. Published by FEBS Press and John Wiley & Sons Ltd.


  • SMURF2
  • Transforming growth factor (TGF)-β
  • lung cancer
  • miR-195
  • miR-497


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