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Dkk-1 inhibits intestinal epithelial cell migration by attenuating directional polarization of leading edge cells

Stefan Koch1, Christopher T Capaldo, Stanislav Samarin

  • 1Epithelial Pathobiology Unit, Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA.

Molecular Biology of the Cell
|September 25, 2009
PubMed

Insights

Dickkopf-1 (Dkk-1), a Wnt antagonist, is secreted by intestinal cells after wounding. It inhibits directional cell migration by disrupting cell polarity, impacting wound healing.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gastroenterology

Background:

  • Wnt signaling pathways are crucial for cell proliferation, motility, and survival.
  • Dickkopf-1 (Dkk-1) is a secreted antagonist of Wnt signaling, implicated in intestinal homeostasis.

Purpose of the Study:

  • To investigate the role of Dkk-1 in intestinal epithelial cell migration and wound healing.
  • To elucidate the molecular mechanisms by which Dkk-1 affects cell polarization and migration.

Main Methods:

  • Studied Dkk-1 secretion by wounded intestinal epithelial cells.
  • Assessed the impact of Dkk-1 on cell migration and directional orientation.
  • Analyzed the localization of Cdc42 and Par6 in response to Dkk-1.
  • Investigated the effect of Dkk-1 on microtubule organizing center and Golgi apparatus relocation.
  • Utilized small interfering RNA (siRNA) to down-regulate Dkk-1 expression.

Main Results:

  • Dkk-1 is secreted by intestinal epithelial cells post-wounding.
  • Dkk-1 inhibits cell migration by impairing directional orientation.
  • Dkk-1 exposure caused mislocalized Cdc42 activation and Par6 displacement from the leading edge.
  • Dkk-1 significantly inhibited the directed relocation of the microtubule organizing center and Golgi apparatus.
  • Extracellular Dkk-1 is essential for these observed effects.

Conclusions:

  • Dkk-1 plays a novel role in regulating the directional polarization of migrating intestinal epithelial cells.
  • Dkk-1's inhibition of cell polarization contributes to its effects on wound closure in vivo.

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