Abstract
Mesenchymal stem cells(MSCs) are currently the research hotspot on promoting wound healing and preventing organ fibrosis. The application of MSCs has reached the clinical trial stage, however, its nomenclature and biological mechanism are still controversial. Early researchers believed that MSCs play the biological role by its multi-directional differentiation, to repair damaged tissues. In recent years, researchers have found that the conditioned medium of MSCs has the same effect as MSCs in promoting wound healing and preventing fibrosis organ. This suggested that the biological effects of MSCs may be mainly caused by its paracrine mechanism. In this paper, the nomenclature evolution, biological mechanism of MSCs, and the existing problems are briefly reviewed. The hypothesis of MSCs microenvironment extracellular vesicles is proposed and discussed. Key words: Mesenchymal stem cells; Wound repair; Extracellular vesicles; Exosome; Microenvironment; Hypothesis
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