Effects of Exosomes From Hypoxia-Induced Adipose-Derived Stem Cells on Ameliorating Photoaging.

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)

Introduction Photoaging, a significant concern in cosmetic dermatology, involves complex skin damage that necessitates effective treatments. Exosomes derived from adipose-derived stem cells (ADSCs), particularly those generated under hypoxic conditions (hypADSC-Exo), have emerged as a promising cell-free therapeutic approach. This study investigates the effects of hypADSC-Exo on reducing human dermal fibroblast (HDF) senescence and mitigating signs of photoaging through topical application in a mouse model. Methods Exosomes were isolated from hypoxia-induced human ADSCs via ultracentrifugation and identified using flow cytometry (CD9, CD63, CD81). Transmission electron microscopy (TEM) confirmed the vesicle morphology, while the Bradford assay and nanoparticle tracking analysis (NTA) assessed the protein content and size. In vitro, UV-induced senescent HDFs were treated with hypADSC-Exo. Cell morphology, senescence (SA-β-gal assay), proliferation (Alamar Blue), and gene expression (p16, p21 via qPCR) were evaluated. In vivo, photoaged mice received hypADSC-Exo treatments (50 or 100 μg/mL) twice weekly for six weeks. Skin parameters (wrinkles, thickness, hydration, elasticity) were evaluated biweekly. Skin biopsies were used to assess epidermal and dermal thickness, collagen density, and gene expression of collagen types 1, 3 and MMP-1, 2, and 3. Results hypADSC-Exo exhibited a

Evidence level

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

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