TGFB1 and pulmonary fibrosis: A study in bleomycin (5 U/kg)-induced PF mice showed that intraperitoneal injection of baicalin (120 mg/kg/d) reduced lung fibrosis, collagen deposition, and hydroxyproline levels in lung tissue through reducing TGFβ1-induced extracellular signal-regulated kinaes 1/2 (ERK1/2) signaling compared with the control [96].