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A microRNA-operated switch of asymmetric-to-symmetric cancer stem cell divisions

Robin G Lerner1, Claudia Petritsch1

  • 1Department of Neurological Surgery, Brain Tumor Research Center, Helen Diller Comprehensive Cancer Center, Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, California, USA.

Nature Cell Biology
|March 1, 2014
PubMed

Insights

Defects in stem cell division contribute to cancer. A new study reveals the Snail, microRNA-146a, and Numb signaling pathway controls cell division symmetry in colorectal cancer stem cells.

Area of Science:

  • Stem cell biology
  • Cancer research
  • Molecular signaling

Background:

  • Asymmetric cell division is crucial for stem cell maintenance and tissue homeostasis.
  • Defects in cell division, particularly asymmetric divisions, are implicated in tumorigenesis.
  • The precise molecular mechanisms regulating cell division symmetry in cancer stem cells remain largely undefined.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing the switch between symmetric and asymmetric cell division in colorectal cancer stem cells.
  • To identify key signaling pathways involved in regulating cell division asymmetry in the context of cancer.

Main Methods:

  • Investigated the roles of Snail, microRNA-146a, and Numb in colorectal cancer stem cells.
  • Utilized molecular biology techniques to analyze the signaling axis.
  • Examined the regulation of cell division symmetry.

Main Results:

  • Identified a novel signaling axis comprising Snail, microRNA-146a, and Numb.
  • Demonstrated that this axis regulates the balance between symmetric and asymmetric cell division.
  • Showed the critical role of this pathway in colorectal cancer stem cells.

Conclusions:

  • The Snail/microRNA-146a/Numb signaling axis is a key regulator of cell division symmetry in colorectal cancer stem cells.
  • Understanding this mechanism provides insights into how stem cell division defects contribute to cancer development.
  • This pathway represents a potential therapeutic target for colorectal cancer treatment.

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