TGFB1 and pemphigus foliaceus: Liu et al. interfered with the bleomycin (BLM)-induced PF model with SalB. The mechanism of SalB in relieving PF involves inhibiting the TGF-β pathway, including alleviating inflammatory injury, reducing disruption of alveolar architecture and collagen deposition, and inhibiting myofibroblast differentiation and EMT (Liu et al., 2016).