Biologically Distinct, Clinically Convergent: A Comparative Study of Umbilical Cord- and Adipose-Derived Mesenchymal Stem Cell Exosomes in Human Skin Regeneration.

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Mesenchymal stem cell (MSC)-derived exosomes are emerging as cell-free bioregenerative platforms in aesthetic dermatology. Umbilical cord (UC-MSC) and adipose-derived (AD-MSC) exosomes are among the most studied sources, yet existing data derive from heterogeneous models that preclude direct comparison. No standardized head-to-head evaluation in a human skin aging model has been conducted. The aim of the study is to compare the regenerative and antiaging effects of UC-MSC and AD-MSC exosomes using a physiologically relevant ex vivo human skin aging model. MSCs were isolated and characterized per International Society for Cellular Therapy criteria. Exosomes were purified through differential ultracentrifugation and analyzed by nanoparticle tracking and flow cytometry. Cytokine cargo was profiled using multiplex assays. Human dermal fibroblasts and ex vivo skin explants were used to assess proliferation, senescence-associated β-gal activity, melanogenesis, senescence-associated secretory phenotype (SASP) suppression (interleukin-6, matrix metalloproteinase-9), and extracellular matrix (ECM) biosynthesis. Topical retinoic acid and resveratrol served as reference controls. Both exosome types increased fibroblast proliferation and reduced senescence. AD-MSC exosomes showed higher vascular endothelial growth factor (VEGF) content, driving angiogenesis and greater collagen and hyaluro

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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