TGFB1 and acute respiratory distress syndrome: Reduced collagen I and α-SMA mRNA was also observed after intervention with mBM-MSC, mBM-MSC-NC, or mBM-MSC-TGFβ1 compared with that in the ARDS group (p < 0.0001), but increased α-SMA mRNA was found in the LPS + mBM-MSC-TGFβ1 group compared with that in the LPS + mBM-MSC-NC group (p < 0.0001, Fig. 9a–d).