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STAT1-mediated translational control in tumor suppression and antitumor therapies

Shuo Wang1, Antonis E Koromilas2

  • 1Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital , Montreal, Quebec, Canada.

Molecular & Cellular Oncology
|June 18, 2016
PubMed

Insights

Signal transducer and activator of transcription 1 (STAT1) acts as a tumor suppressor, paradoxically protecting cancer cells from DNA-damaging drugs. This involves STAT1 regulating mRNA translation for proteins with antitumor or prosurvival functions.

Area of Science:

  • Molecular biology
  • Cancer research
  • Cellular signaling

Background:

  • Signal transducer and activator of transcription 1 (STAT1) exhibits dual roles in cancer.
  • STAT1 functions as a tumor suppressor but also confers resistance to chemotherapy.
  • Understanding STAT1's regulatory mechanisms is crucial for cancer therapy.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which STAT1 mediates its tumor suppressor and cytoprotective functions.
  • To investigate the role of STAT1 in regulating mRNA translation in cancer cells.
  • To identify specific mRNA targets influenced by STAT1.

Main Methods:

  • Analysis of STAT1-dependent gene expression.
  • mRNA translation assays.
  • Western blotting to assess protein levels.
  • Cell viability assays following DNA-damaging drug treatment.

Main Results:

  • STAT1 regulates the translation of specific mRNAs.
  • This translational control contributes to both tumor suppression and drug resistance.
  • STAT1 influences mRNAs encoding proteins with opposing functions (antitumor vs. prosurvival).

Conclusions:

  • STAT1 employs mRNA translation regulation as a key mechanism for its diverse roles in cancer.
  • Targeting STAT1-mediated translation could offer novel therapeutic strategies.
  • STAT1's dual function highlights the complexity of targeting transcription factors in oncology.
Keywords:
Antitumor therapiesSTAT1cell survivalchemotherapeutic drugsgene transcriptionmRNA translation initiationprotein phosphorylation

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