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Adipose stem cell-derived exosomes promote wound healing by regulating the let-7i-5p/GAS7 axis
1Department of Surgery, Wangjing Hospital, China Academy of Chinese Medical Sciences, Beijing, China.
Journal of Cosmetic Dermatology
|March 2, 2024
Summary
Adipose stem cell-derived exosomes (ADSC-exos) promote skin wound healing by delivering microRNA-let-7i-5p (let-7i-5p) to inhibit GAS7. This mechanism enhances cell viability and migration, accelerating the healing process.
Area of Science:
- Regenerative Medicine
- Biotechnology
- Cell Biology
Background:
- Skin tissue injury poses significant health challenges, necessitating advanced wound healing strategies.
- Normal wound healing involves complex, overlapping phases: hemostasis, inflammation, proliferation, and remodeling.
- Investigating adipose stem cell-derived exosomes (ADSC-exos) offers a promising avenue for enhancing wound repair.
Purpose of the Study:
- To explore the therapeutic potential of ADSC-exos in accelerating wound healing.
- To elucidate the underlying molecular mechanisms by which ADSC-exos influence skin repair processes.
Main Methods:
- Utilized in vitro (hydrogen peroxide-treated HaCaT cells) and in vivo (animal wound models) systems.
- Assessed cell migration via transwell and wound healing assays; analyzed exosome biomarkers with western blot.
- Characterized adipose stem cells using flow cytometry, specific staining (alizarin red S, oil red O), and transmission electron microscopy.
Main Results:
- ADSC-exos significantly promoted HaCaT cell viability and migration, counteracting hydrogen peroxide-induced inhibition.
- Mechanistic analysis revealed that ADSC-exos deliver microRNA-let-7i-5p (let-7i-5p) into HaCaT cells, suppressing growth arrest-specific-7 (GAS7) expression.
- Rescue experiments confirmed that GAS7 overexpression reversed the pro-healing effects of let-7i-5p, validating the let-7i-5p/GAS7 axis.
Conclusions:
- ADSC-exos enhance HaCaT cell viability and migration through the let-7i-5p/GAS7 pathway.
- This exosome-mediated mechanism effectively promotes wound healing in a rat model.
- ADSC-exos represent a potent therapeutic agent for accelerating skin tissue repair.
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