CCL2 and acute respiratory distress syndrome: Interestingly, TSCs demonstrated no effects on the levels of IL-6, MCP1 and KC in MLE-12 cells exposed to BLM in vitro, suggesting that the decrease of these mediators in the lungs of ALI mice by TSCs was likely related to a decrease in immune cells infiltrating into the lungs and not BLM-induced production in lung epithelial cells.