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Development of a Benchtop Model for Evaluating the Compatibility of Wound Dressing Materials with Negative Pressure Wound Therapy Systems
Published on: May 2, 2025
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Improving Senescent Wound Healing With Local and Systemic Therapies
Caroline Szpalski1, Parag Butala, Meredith T Vandegrift
1From the Hansjörg Wyss Department of Plastic Surgery, Basic Science Laboratories, NYU School of Medicine, New York, NY.
Annals of Plastic Surgery
|May 22, 2018
Summary
This study shows that suppressing p53 locally or mobilizing endothelial progenitor cells (EPCs) systemically significantly enhances wound healing in aged mice by improving neovascularization.
Area of Science:
- Regenerative Medicine
- Aging Biology
- Wound Healing Research
Background:
- The global population is aging, leading to an increased incidence of chronic wounds.
- Neovascularization is critical for effective tissue repair, but is often impaired in aged individuals.
- Both local and systemic factors influence new blood vessel formation, impacting wound healing outcomes.
Purpose of the Study:
- To investigate whether modulating local p53 expression and/or systemic endothelial progenitor cell (EPC) mobilization can enhance wound healing in a murine model of aging.
- To determine the effects of these interventions on provasculogenic and proapoptotic factors within the wound microenvironment.
- To assess the impact on circulating EPC levels and neovascularization in senescent wounds.
Main Methods:
- A murine model of senescent wound healing (Zmpste24 mice) was utilized with bilateral full-thickness wounds.
- Animals were treated with topical p53 small interfering RNA (siRNA) or systemic AMD3100 (an EPC mobilizer).
- Wound healing was monitored over 40 days, with assessments including molecular analysis (PCR, ELISA, immunostaining) and circulating EPC quantification (flow cytometry).
Main Results:
- Local p53 siRNA treatment significantly accelerated wound healing (18 vs 40 days) and increased local provasculogenic factors while decreasing proapoptotic factors.
- Systemic AMD3100 treatment also significantly improved wound healing (20 vs 40 days) and enhanced EPC mobilization.
- Both treatments led to a significant increase in blood vessel density within the wound bed and elevated circulating EPC levels.
Conclusions:
- Local suppression of p53 and systemic mobilization of EPCs are effective strategies to improve age-related wound healing impairment.
- These interventions enhance wound healing by promoting neovascularization through modulation of local molecular factors and increased circulating EPCs.
- The findings suggest a potential therapeutic approach for accelerating chronic wound repair in elderly populations.
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