Exosomes Derived from Antler Mesenchymal Stem Cells Promote Wound Healing by miR-21-5p/STAT3 Axis

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Wound Healing Research

Background:

• Deer antlers regenerate annually without scarring, offering a unique model for regenerative medicine.
• Mesenchymal stem cells from antlers produce exosomes (AMSC-Exo) with potential therapeutic applications.
• This study investigates AMSC-Exo for enhancing skin wound healing.

Purpose of the Study:

• To evaluate the effects of AMSC-Exo on skin cell proliferation, migration, and angiogenesis.
• To assess the efficacy of AMSC-Exo in a mouse model of full-thickness skin injury.
• To elucidate the molecular mechanisms underlying AMSC-Exo-mediated skin repair.

Main Methods:

• In vitro assays using HaCaT and HUVEC cells to assess proliferation, migration, and angiogenesis.
• Establishment of a full-thickness skin injury mouse model.
• Histological (H&E, Masson's trichrome) and immunofluorescence analyses for tissue repair assessment.
• MiRNA sequencing to identify key regulatory pathways.

Main Results:

• AMSC-Exo significantly enhanced proliferation and migration of skin cells (HaCaT) and angiogenesis in endothelial cells (HUVEC).
• In vivo, AMSC-Exo promoted angiogenesis, regulated collagen type III to type I conversion, and restored epidermal thickness.
• Wound healing was improved, characterized by increased vascularization and reduced scarring.
• MiRNAs, particularly miR-21-5p via the STAT3 pathway, were identified as crucial mediators.

Conclusions:

• AMSC-Exo demonstrate significant therapeutic potential for accelerating skin wound healing.
• The study highlights a novel regenerative strategy utilizing antler-derived exosomes.
• AMSC-Exo offer a promising avenue for advanced wound care and tissue regeneration.