Fibronectin binding modulates CXCL11 activity and facilitates wound healing

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Molecular Biology

Background:

• Engineered biomatrices are crucial for recapitulating the regenerative microenvironment in tissue repair.
• Understanding molecular interactions between growth factors, cytokines, and the extracellular matrix (ECM) is vital for advancing regenerative medicine.
• CXCR3 ligands (CXCL9, CXCL10, CXCL11) are involved in wound healing processes.

Purpose of the Study:

• To investigate the interactions between ECM proteins fibronectin (FN) and fibrinogen (Fg) and CXCR3 ligands (CXCL9, CXCL10, CXCL11).
• To explore the functional impact of these interactions on keratinocyte migration and wound healing.
• To inform the design of functional matrices for regenerative medicine applications.

Main Methods:

• Characterization of binding interactions between FN, Fg, and CXCL9, CXCL10, CXCL11.
• In vitro transmigration assays using human keratinocytes.
• In vivo wound healing studies in diabetic db/db mice using functionalized fibrin matrices.

Main Results:

• Specific heparin-binding domains in Fg (Fg β15-66) and FN (FNI1-5) were identified as binding sites for CXCL10 and CXCL11.
• A synergistic effect was observed between FN and CXCL11, enhancing keratinocyte migration in vitro.
• Functionalized fibrin matrices containing FN and CXCL11 significantly improved wound healing in vivo.

Conclusions:

• The study elucidates novel binding interactions between ECM proteins and CXCR3 ligands.
• These findings underscore the significance of cytokine-ECM interactions in the context of wound healing.
• The results provide a basis for developing advanced functional matrices for regenerative medicine.