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Function of miR-212 as a tumor suppressor in thyroid cancer by targeting SIRT1

Dandan Li1, Lin Bai1, Tongtong Wang1

  • 1Department of Nuclear Medicine, China-Japan Union Hospital of Jilin University, Changchun, Jilin 13033, P.R. China.

Oncology Reports
|December 6, 2017
PubMed

Insights

MicroRNA-212 (miR-212) acts as a tumor suppressor in thyroid cancer, with its decreased expression linked to advanced disease. Restoring miR-212 inhibits cancer cell growth and metastasis by targeting SIRT1.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • MicroRNA-212 (miR-212) is a known tumor suppressor downregulated in various cancers.
  • The specific role of miR-212 in thyroid cancer pathogenesis remains unexplored.

Purpose of the Study:

  • To investigate the function of miR-212 in human thyroid cancer.
  • To elucidate the molecular mechanisms underlying miR-212's role in thyroid cancer.

Main Methods:

  • Quantitative real-time PCR to assess miR-212 expression in thyroid cancer tissues and cell lines.
  • Transfection with miR-212 mimics to evaluate functional effects on cancer cell proliferation, colony formation, migration, and invasion.
  • Western blotting and luciferase reporter assays to identify and validate direct targets of miR-212.
  • In vivo tumor xenograft models in nude mice to assess the effect of miR-212 on tumor growth.

Main Results:

  • miR-212 expression was significantly reduced in thyroid cancer tissues and cell lines compared to normal controls.
  • Downregulation of miR-212 correlated negatively with lymph node metastasis and advanced clinical stage.
  • Ectopic miR-212 expression suppressed thyroid cancer cell proliferation, colony formation, migration, and invasion.
  • Sirtuin 1 (SIRT1) was identified as a direct target of miR-212, with inverse expression correlation observed in patient tissues.
  • Overexpression of SIRT1 rescued the inhibitory effects of miR-212 on cancer cell phenotypes.
  • In vivo studies confirmed that miR-212 overexpression inhibited tumor growth.

Conclusions:

  • miR-212 functions as a tumor suppressor in human thyroid cancer.
  • miR-212 exerts its tumor-suppressive effects, at least in part, by directly targeting SIRT1.
  • miR-212 represents a potential therapeutic target for thyroid cancer treatment.

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