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Wnt activity and basal niche position sensitize intestinal stem and progenitor cells to DNA damage

Si Tao1, Duozhuang Tang2, Yohei Morita2

  • 1Leibniz Institute for Age Research - Fritz Lipmann Institute e.V. (FLI), Jena, Germany Institute of Biochemistry and Molecular Biology, Ulm University, Ulm, Germany International Graduate School in Molecular Medicine Ulm, Ulm University, Ulm, Germany.

The EMBO Journal
|January 23, 2015
PubMed

Insights

Niche positioning and Wnt signaling influence intestinal stem cell sensitivity to DNA damage. Enhanced Wnt signaling increases radio-sensitivity, while inhibition decreases it, impacting stem cell selection.

Area of Science:

  • Cellular biology
  • Stem cell research
  • DNA damage response

Background:

  • Aging and cancer involve DNA damage accumulation in stem cells.
  • Mechanisms governing stem cell responses to DNA damage are not fully understood.

Purpose of the Study:

  • To investigate how niche positioning and Wnt signaling affect intestinal stem and progenitor cell (ISPC) sensitivity to DNA damage.
  • To elucidate the role of Wnt/β-catenin activity in DNA damage response pathways.

Main Methods:

  • Comparative analysis of ISPCs at different crypt positions with varying Wnt signaling activity.
  • Assessment of DNA damage-induced Wnt signaling activation and checkpoint response.
  • Manipulation of Wnt signaling to evaluate its impact on ISPC radio-sensitivity.

Main Results:

  • ISPCs at the crypt bottom (high Wnt activity) are more sensitive to DNA damage than those in position 4 (low Wnt activity).
  • DNA damage activates Wnt signaling, amplifying DNA damage checkpoint activation.
  • Enhanced Wnt signaling increases ISPC radio-sensitivity; inhibition decreases it.

Conclusions:

  • Cell-intrinsic Wnt signaling levels modulate ISPC sensitivity to DNA damage.
  • Heterogeneity in stem cell niche Wnt activation influences ISPC selection under DNA damage stress.
  • Wnt signaling represents a potential target for modulating stem cell responses to genotoxic agents.
Keywords:
DNA damageWntintestinal progenitor cellsintestinal stem cellstelomeres

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