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miR-296 regulation of a cell polarity-cell plasticity module controls tumor progression

V Vaira1, A Faversani, T Dohi

  • 1Division of Pathology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.

Oncogene
|June 7, 2011
PubMed

Insights

MicroRNA-296 (miR-296) is lost during cancer progression and suppresses tumor growth and metastasis. Its loss leads to increased Scrib expression, promoting cell migration and invasiveness, highlighting miR-296 as a key regulator of tumorigenicity.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • MicroRNAs (miRs) are small, non-coding RNAs with deregulated expression in human cancers.
  • The precise role of miRs in cancer progression and metastasis remains largely unclear.

Purpose of the Study:

  • To investigate the role of miR-296 in cancer progression and metastasis.
  • To identify the molecular mechanisms by which miR-296 influences tumor cell behavior.

Main Methods:

  • Analysis of miR-296 expression across various human cancers.
  • Functional studies involving miR-296 re-expression in cancer cell lines.
  • Investigation of miR-296's regulatory targets, including Scribble (Scrib).
  • Correlation of miR-296 and Scrib levels with patient outcomes.

Main Results:

  • miR-296 is progressively lost during tumor progression and correlates with metastatic disease in multiple cancer types.
  • miR-296 represses Scrib expression, a key regulator of cell polarity and plasticity.
  • Loss of miR-296 leads to increased and mislocalized Scrib, promoting cell migration and invasiveness.
  • Re-expression of miR-296 inhibits tumor growth in vivo.
  • miR-296 and Scrib levels predict tumor relapse in hepatocellular carcinoma patients.

Conclusions:

  • miR-296 acts as a global repressor of tumorigenicity.
  • The miR-296/Scrib axis represents a novel mechanism exploited in human tumor progression.
  • miR-296 levels can serve as a predictive biomarker for tumor relapse.

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