In Vitro Assessment of Chitosan-PEG Hydrogels Enriched with MSCs-Exosomes for Enhancing Wound Healing

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Skin tissue regeneration is challenging, particularly for diabetic patients, often leading to scarring and delayed healing.
• Therapeutic dressings with drug-delivery systems are emerging to address these wound complications.
• Mesenchymal stem cell-derived exosomes (MSCs-Exos) offer cell-free therapeutic benefits, including anti-inflammatory and tissue repair properties.

Purpose of the Study:

• To develop and evaluate an advanced wound dressing combining chitosan (CS) and polyethylene glycol (PEG) hydrogel with adipose MSCs-derived Exos (ADMSCs-Exos).
• To assess the efficacy of this composite hydrogel-exosome dressing in promoting severe skin injury healing.
• To investigate the in vitro mechanisms underlying the enhanced wound healing properties.

Main Methods:

• Fabrication of a CS-PEG hydrogel loaded with ADMSCs-Exos using a simple blending technique.
• In vitro assessment of endothelial cell migration, oxidative stress reduction, and angiogenesis.
• Real-time polymerase chain reaction (RT-PCR) analysis to evaluate gene expression related to wound healing.

Main Results:

• The hydrogel-exosome dressing demonstrated significant enhancement of endothelial cell migration.
• The dressing effectively reduced oxidative stress markers in vitro.
• Promoted angiogenesis and showed significant upregulation of key wound healing genes via RT-PCR.

Conclusions:

• The developed hydrogel-exosome composite dressing shows significant potential for improving severe skin injury healing.
• This innovative dressing offers a promising cell-free therapeutic strategy for advanced wound care.
• The combination of hydrogel and exosomes facilitates sustained release and synergistic therapeutic effects.