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Levels of Collagen I, Collagen III, α-SMA, and Smad2/3, and Smad2/3 phosphorylation in fibroblasts treated with exosomes decreased markedly. After treatment with exosomes and TGF-β1 together, levels of Collagen I, Collagen III, α-SMA, and Smad2/3, and Smad2/3 phosphorylation in fibroblasts decreased significantly as compared to TGF-β1-treated fibroblasts. Exosome treatment reduced the entry of Smad2/3 into fibroblasts. Conclusion Our data suggested that hUC-MSCs-derived exosomes could inhibit dermal fibroblasts-myofibroblasts transition b