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The aim of our study was to investigate the therapeutic effect of Mesenchymal stem cell-derived exosomes (MSC-exs) on eczema mice model. Eczema mice were established by 2, 4-two nitrochlorobenzene. Human umbilical cords cells and exosomes were harvested. In eczema mice model, the effect of MSC-ex on eczema was evaluated by severity score, atopic dermatitis score and histopathological analysis of dermis. MTT tests were performed to assess PBMC proliferation. Treg was identified by flow cytometry. The angiogenesis was analyzed by endothelial cell tube formation assay. Compared with PBS, the wound closure of animals treated with MSC-exs was faster. After MSC-exs treatment, there were more new epidermis and dermis, and less scar formation of the lesion. There were significant differences in the integral score of skin injury and the number of lymphocyte infiltration in the skin between the treatment group and the PBS group ( p  &lt; .01). MSC-exs significantly inhibit Peripheral blood mononuclear cell proliferation, promote the transformation of Treg and the formation of endothelial tube. MSC-ex accelerated wounds healing in mice eczema model by inhibiting inflammatory cell infiltration and promoting vascular formation.

Human mesenchymal stem cell-derived exosomes accelerate wound healing of mice eczema