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Related Experiment Video

Updated: May 5, 2026

Characterizing Epithelial Wound Healing In Vivo Using the Cnidarian Model Organism Clytia hemisphaerica
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Epithelial bridges maintain tissue integrity during collective cell migration.

Sri Ram Krishna Vedula1, Hiroaki Hirata1, Mui Hoon Nai1

  • 1Mechanobiology Institute, National University of Singapore, 117411, Singapore.

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|December 3, 2013
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Human skin cells called keratinocytes form suspended multicellular bridges to maintain tissue integrity during wound healing. These bridges, reinforced by actin bundles, are crucial when cell-substrate interactions are weak, aiding skin regeneration.

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Area of Science:

  • Cell biology
  • Biomaterials science
  • Tissue engineering

Background:

  • Skin integrity is vital for barrier function, maintained by keratinocyte cohesion during wound healing.
  • Keratinocytes migrate collectively, adapting to extracellular matrix variations.

Purpose of the Study:

  • To investigate how keratinocytes maintain cohesion over non-adherent areas during migration.
  • To understand the mechanical properties of multicellular structures formed by migrating keratinocytes.

Main Methods:

  • Utilized functionalized micropatterned surfaces with alternating fibronectin and non-adherent polymer strips.
  • Observed human keratinocyte monolayers migrating on these surfaces.
  • Analyzed bridge formation, intercellular adhesion, and actin bundle presence.
  • Employed a force propagation model to simulate bridge mechanics.

Main Results:

  • Keratinocytes formed suspended multicellular bridges over non-adherent polymer regions.
  • These bridges exhibited significant tension, evidenced by prominent actin bundles.
  • A mechanical model accurately predicted bridge maintenance and tension distribution.

Conclusions:

  • Multicellular bridges are a mechanism for maintaining tissue integrity in conditions of weak cell-substrate interaction, as seen in wound healing.
  • Findings offer insights for designing artificial scaffolds for skin regeneration.