TGFB1 and pulmonary fibrosis: Besides the ECM-receptor interaction and TGF-β signaling pathway, the focal adhesion (Zhao et al., 2016), adherens junction (Lappi-Blanco et al., 2013), and Hippo signaling pathway (Liu et al., 2015) have also been proven to contribute to the EMT and pathogenesis of pulmonary fibrosis.