Graft-Host Interaction and Its Effect on Wound Repair Using Mouse Models

Area of Science:

• Regenerative Medicine
• Wound Healing Research
• Biomaterials Science

Background:

• Autologous skin grafting is a standard wound closure technique, but underlying molecular mechanisms remain unclear.
• Understanding cellular and molecular interactions is crucial for developing advanced wound repair strategies.
• Engineered skin grafts require a molecular basis for design and testing.

Purpose of the Study:

• To elucidate molecular changes in wound beds following autologous and synthetic skin grafting.
• To compare the inflammatory and reparative responses to different graft types.
• To establish a foundation for designing novel engineered skin substitutes.

Main Methods:

• Utilized a full-thickness skin graft mouse model (SKH-1 hairless).
• Applied either autologous full-thickness skin grafts (FTSG) or synthetic Biodegradable Temporising Matrix (BTM).
• Performed histological, RNA, and protein analyses at key wound repair phases (days 1, 5, 21).

Main Results:

• Autologous FTSG significantly reduced inflammatory markers (Il-6, Cxcl-1, Cxcl-5/6) compared to controls.
• Synthetic BTM grafts showed persistently high levels of Cxcl-1 and Cxcl-5/6 up to 21 days.
• Autologous FTSG decreased wound contraction, while synthetic grafts exhibited greater contraction, potentially due to myofibroblasts and TGF-β1.
• No TGF-β1-mediated Connective Tissue Growth Factor (CTGF) upregulation was observed.

Conclusions:

• Autologous skin grafting modulates the wound environment by reducing inflammation and contraction.
• Synthetic grafts elicit a prolonged inflammatory response and increased contraction.
• Findings provide molecular insights for optimizing engineered skin graft development.