FGF7 and acute respiratory distress syndrome: KGF is a human mitogen secreted from mesenchymal cells, which plays a key role in enhancing alveolar type epithelial II cell proliferation and DNA repair, and inhibiting oxidant-induced epithelial cell permeability.26,27 Zhu and coworkers have demonstrated that MSC-microvesicles (MSC-MVs) are able to relieve the severity of lung injury in the mouse model of E. coli endotoxin-induced ALI.28