[Research progress of mesenchymal stem cells attenuating acute respiratory distress syndrome by regulating the balance of M1/M2 macrophage polarization].

Acute respiratory distress syndrome (ARDS) is a common clinical critical disease, characterized by progressive respiratory distress, intractable hypoxemia, respiratory failure and so on, with high mortality rate and lack of effective prevention and treatment strategies. In recent years, mesenchymal stem cell (MSC) can be used in the treatment of acute lung injury (ALI), which cannot only replace the damaged lung epithelial cells, but also promote tissue repair and alleviate ARDS by secreting anti-inflammatory and anti-fibrosis factors. This review focuses on the related mechanisms and signal pathways of MSC and its paracrine factors in the treatment of ARDS by regulating the balance of macrophage polarization.