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Suppression of SIK1 by miR-141 in human ovarian cancer cell lines and tissues

Jin-Long Chen1, Fang Chen2, Ting-Ting Zhang3

  • 1School of Medicine and Life Sciences, University of Jinan-Shandong Academy of Medical Sciences, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Sciences, Jinan, Shandong 250117, P.R. China.

International Journal of Molecular Medicine
|April 16, 2016
PubMed

Insights

Salt-inducible kinase 1 (SIK1) is downregulated in epithelial ovarian cancer (EOC). Its restoration inhibits cancer cell proliferation, while miR-141 promotes EOC progression by targeting SIK1.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Epithelial ovarian cancer (EOC) is a leading cause of cancer-related death in women globally.
  • Limited understanding of EOC molecular pathogenesis hinders effective treatment development.
  • SIK1 (salt-inducible kinase 1) role in EOC was previously unknown.

Purpose of the Study:

  • Investigate the role of SIK1 in epithelial ovarian cancer.
  • Identify molecular mechanisms regulating SIK1 expression and function.
  • Determine the therapeutic potential of targeting SIK1 or its regulators in EOC.

Main Methods:

  • Analysis of SIK1 expression in ovarian cancer tissues.
  • In vitro studies using ovarian cancer cell lines (HEY and EG) to assess SIK1 function.
  • Bioinformatic prediction and experimental validation of microRNA (miRNA) targets for SIK1.
  • Manipulation of SIK1 and miR-141 expression via overexpression and silencing techniques.

Main Results:

  • SIK1 was found to be downregulated in ovarian cancer tissues.
  • SIK1 overexpression inhibited proliferation and cancer stem cell traits in HEY cells.
  • SIK1 silencing promoted proliferation in EG cells.
  • miR-141 was predicted and confirmed to target SIK1, and its levels correlated with disease progression.
  • miR-141 promoted proliferation in EG cells; silencing miR-141 restored SIK1 and inhibited HEY cell proliferation.

Conclusions:

  • SIK1 acts as a tumor suppressor in epithelial ovarian cancer.
  • miR-141 promotes EOC progression by downregulating SIK1.
  • Targeting the miR-141/SIK1 axis offers a potential therapeutic strategy for EOC.

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