Visualizing Scar Development Using SCAD Assay - An Ex-situ Skin Scarring Assay

Area of Science:

• Wound Healing Research
• Fibroblast Biology
• Tissue Engineering

Background:

• Mammalian wound healing involves scar formation and tissue contraction by fascia fibroblasts.
• Current understanding of fibroblast dynamics in complex wound environments is limited due to assay limitations.
• Direct visualization of fibroblast choreography in skin wounds is crucial for advancing repair research.

Purpose of the Study:

• To present a novel protocol for generating ex-situ skin scars that mimic in-vivo wound environments.
• To enable direct visualization of fibroblast dynamics and choreography during wound repair.
• To facilitate research into fundamental wound healing processes and the effects of modulators.

Main Methods:

• Development of the SCar-like tissue in A Dish (SCAD) assay.
• Excision and upside-down culture of full-thickness skin (2 mm) in media for 5 days.
• Integration with fibroblast-lineage specific transgenic mouse models for lineage tracing.

Main Results:

• The SCAD assay successfully generates uniform scars and skin contractures in vitro.
• The methodology allows for visualization of individual fibroblast lineages throughout the wound repair process.
• The assay emulates the complex cellular environment of skin wounds.

Conclusions:

• The SCAD protocol provides a valuable tool for studying fibroblast behavior in wound healing.
• This assay aids in understanding the fundamental mechanisms of scar formation and tissue contraction.
• Researchers can now directly explore wound healing modulators and their impact on outcomes.