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Small EVs From Adipose-Derived MSCs Modulate Epidermal Barrier and Inflammation Via Sphingosine-1-Phosphate Signaling

Kyong-Oh Shin1,2, Jun Ho Lee3, Seungwoo Chae1

  • 1Department of Food Science and Nutrition, Convergence Program of Material Science for Medicine and Pharmaceutics, Hallym University, Chuncheon, Republic of Korea.

Journal of Extracellular Vesicles
|July 22, 2025
PubMed

Insights

Adipose stem cell-derived extracellular vesicles (ASC-sEVs) improve skin barrier function and reduce inflammation in atopic dermatitis models. They achieve this by altering lipid metabolism and activating sphingosine-1-phosphate signaling in skin cells.

Area of Science:

  • Dermatology
  • Cell Biology
  • Biochemistry

Background:

  • Epidermal permeability barrier defects are hallmarks of skin diseases like atopic dermatitis (AD).
  • Small extracellular vesicles (sEVs) derived from human adipose tissue mesenchymal stem cells (ASCs) have shown promise in ameliorating AD symptoms.
  • The precise mechanisms by which ASC-sEVs normalize barrier function and reduce inflammation in AD remain to be fully elucidated.

Purpose of the Study:

  • To investigate the lipid and ceramide metabolic enzyme content of ASC-sEVs compared to donor ASCs.
  • To elucidate the molecular mechanisms by which ASC-sEVs alleviate skin inflammation and barrier defects in AD.
  • To determine the role of sphingosine-1-phosphate signaling in ASC-sEV-mediated therapeutic effects.

Main Methods:

  • Characterization of lipid profiles and key ceramide metabolic enzymes within ASC-sEVs and donor ASCs.
  • Analysis of ASC-sEVs' impact on sphingosine-1-phosphate levels in AD-model human keratinocytes.
  • Assessment of ASC-sEVs' effects on pro-inflammatory cytokine production and keratinocyte differentiation in vitro.

Main Results:

  • ASC-sEVs are enriched in free fatty acids, ceramides, and sphingomyelin compared to donor ASCs.
  • Key enzymes involved in ceramide synthesis and sphingosine-1-phosphate metabolism are upregulated in ASC-sEVs.
  • ASC-sEV treatment increases sphingosine-1-phosphate levels in keratinocytes, suppressing inflammation and restoring differentiation.

Conclusions:

  • ASC-sEVs possess a distinct lipid and enzyme profile that facilitates therapeutic effects in AD.
  • The sphingosine-1-phosphate signaling pathway activated by ASC-sEVs is crucial for reducing inflammation and restoring skin barrier function.
  • Cells internalizing ASC-sEVs can normalize epidermal barrier function and alleviate inflammation through this pathway.
Keywords:
adipose tissue‐derived mesenchymal stem cellsatopic dermatitisceramide metabolic enzymelipidskinsmall extracellular vesiclessphingosine‐1‐phosphate

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