FGF7 and acute respiratory distress syndrome: In a mouse model of E. coli endotoxin-induced ALI, Zhu et al. (42) also confirmed the similar beneficial effects of human MSC-EVs and further demonstrated that the protection was in part due to the delivery of keratinocyte growth factor (KGF) mRNA from MSC-EVs to the injured alveolar epithelium and lung endothelium.