Type III Collagen Regulates Matrix Architecture and Mechanosensing during Wound Healing

Area of Science:

• Biomedical Science
• Dermatology
• Regenerative Medicine

Background:

• Postnatal wound healing typically results in scar formation, compromising tissue architecture and function.
• Minimizing scar formation while promoting efficient healing is a critical goal in wound management.

Purpose of the Study:

• To investigate the role of type III collagen (COL3) in regulating cutaneous wound healing, re-epithelialization, and scar formation.
• To define the collagen architecture signature associated with scar-permissive healing and how COL3 influences it.
• To explore how COL3 deficiency impacts cellular mechanoperception and profibrotic signaling.

Main Methods:

• Utilized multiple murine cutaneous wound models, including COL3-enriched, scar-permissive, and COL3-deficient (conditional knockdown) systems.
• Analyzed collagen fiber architecture, specifically alignment and elongation, in healing wounds.
• Assessed cellular mechanoperception and integrin engagement (integrin α11) in response to COL3 levels.

Main Results:

• Identified a scar-permissive fibrillar collagen architecture characterized by elongated, anisotropic fibers, which is suppressed by COL3 in a dose-dependent manner.
• Demonstrated that COL3 deficiency alters cellular mechanoperception, leading to mechanically active phenotypes even without increased matrix stiffness.
• Showed upregulation and engagement of the profibrotic integrin α11 in COL3-deficient cells.

Conclusions:

• Type III collagen (COL3) is a critical regulator of skin wound healing, influencing both matrix architecture and cellular responses.
• COL3 deficiency promotes scar formation by altering collagen alignment and enhancing cellular mechanotransduction via integrin α11.
• Understanding COL3's role may lead to novel clinical strategies for scarless wound healing.