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Related Concept Videos

Phases of Wound Repair01:28

Phases of Wound Repair

Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
Formation of Blood Clot
In case of deep injuries, trauma to blood vessels results in blood loss. In the meantime, phospholipids released from the ruptured endothelial cellular membrane are converted into arachidonic...
Clinical Applications of Epidermal Stem Cells01:19

Clinical Applications of Epidermal Stem Cells

Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own EpiSCs...

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Related Experiment Video

Updated: May 12, 2026

Ex Vivo Corneal Organ Culture Model for Wound Healing Studies
06:46

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Published on: February 15, 2019

Timed Epithelial Overlay Preserves Defect Closure While Suppressing Fibrotic Remodeling in Wound Microtissues.

Yingying Jiang1,2, Xiaoning Han1,3, Linhong Deng1,3

  • 1Institute of Biomedical Engineering and Health Sciences, Changzhou University, 213164 Changzhou, Jiangsu, China.

ACS Omega
|May 11, 2026
PubMed
Summary

Timing epithelialization is key for wound healing. Delaying epithelial cell (EC) overlay preserves closure speed while reducing scar-like tissue formation, optimizing wound repair therapies.

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Area of Science:

  • Biomedical Engineering
  • Wound Healing Research
  • Tissue Engineering

Background:

  • Re-epithelialization is crucial for restoring skin barrier function and modulating fibroblast activity during wound healing.
  • The precise role of epithelial coverage in balancing closure efficiency with scar-like fibrotic remodeling remains incompletely understood.

Purpose of the Study:

  • To investigate how epithelial coverage timing influences fibroblast-driven wound closure and fibrotic remodeling.
  • To establish a quantitative model for assessing epithelial regulation of wound healing dynamics.

Main Methods:

  • Development of a tension-bearing NIH-3T3-collagen microtissue model with elastic scaffolds and a 500 μm circular microdefect.
  • Application of MDCK epithelial overlay at different time points postwounding (immediate vs. 48 hours).
  • Quantification of defect closure, microtissue contraction, fibroblast proliferation, myofibroblast differentiation, and fibronectin accumulation.

Main Results:

  • Immediate epithelial overlay inhibited contraction-driven closure and suppressed wound edge proliferation.
  • Delayed epithelial overlay (48 hours) preserved rapid closure, attenuated microtissue compaction, and reduced myofibroblast differentiation and fibronectin accumulation.
  • Delayed overlay maintained fibroblast repopulation and effective epithelial coverage, attenuating remodeling gradients.

Conclusions:

  • An optimal postwounding epithelial loading window exists that balances closure efficiency with reduced scar-like remodeling.
  • Epithelial-derived signals, potentially including prostaglandin E2, play a role in modulating fibroblast activity.
  • This engineered 3D wound model provides a platform for optimizing epithelial-assisted wound therapies and antifibrotic interventions.