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Related Concept Videos

Clinical Applications of Epidermal Stem Cells01:19

Clinical Applications of Epidermal Stem Cells

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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Related Experiment Video

Updated: Oct 25, 2025

Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ
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Topical α-Gal Nanoparticles Enhance Wound Healing in Radiated Skin.

Arash Samadi1, Justin Buro1, Xue Dong1

  • 1Division of Plastic Surgery, Laboratory of Bioregenerative Medicine & Surgery, Weill Cornell Medicine, New York, New York, USA.

Skin Pharmacology and Physiology
|August 4, 2021
PubMed
Summary
This summary is machine-generated.

Topical application of antigen α-gal nanoparticles (AGNs) accelerates wound healing in irradiated tissues. This novel approach enhances epithelial migration and speeds closure in previously radiated skin, offering a promising therapeutic strategy.

Keywords:
Alpha-galExcisional wound modelRadiated tissueTherapeutic nanoparticlesWound healing

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Area of Science:

  • Wound healing research
  • Immunology
  • Nanotechnology applications in medicine

Background:

  • Surgery in radiated tissues often leads to increased complications and impaired wound healing due to aberrant inflammatory responses.
  • Previous studies show topical antigen α-gal nanoparticles (AGNs) accelerate healing in normal and diabetic wounds by enhancing macrophage recruitment.

Purpose of the Study:

  • To investigate the efficacy of topical AGNs in enhancing wound healing within previously irradiated tissues.
  • To test the hypothesis that AGNs can overcome the delayed healing typically observed in radiated skin.

Main Methods:

  • Utilized α-1,3-galactosyltransferase knockout (KO) mice, which produce anti-α-gal antibodies, simulating human physiology.
  • Irradiated dorsal skin (40 Gy) 10 days prior to creating 6-mm full-thickness wounds.
  • Treated wounds with AGNs (50 mg/mL) or phosphate-buffered saline (PBS) vehicle, comparing outcomes with wild-type (WT) mice.

Main Results:

  • Histologic analysis revealed significantly enhanced epithelial migration in radiated/AGN-treated KO wounds compared to radiated/PBS-treated controls (p < 0.01) from day 15 onwards.
  • AGNs demonstrated no significant effect on epithelial migration in WT mice, indicating a mechanism dependent on pre-existing anti-α-gal antibodies.

Conclusions:

  • Topical application of AGNs significantly ameliorates delayed wound healing in irradiated skin.
  • Transient application of AGNs results in faster wound closure, suggesting a viable therapeutic option for complex wounds.