TGFB1 and pulmonary fibrosis: In order to determine the changes of TGFβ1/NOX4 and PDGF/ROCK signal pathway in idiopathic pulmonary fibrosis after Yifei decoction combined with MitoQ intervention, we detected the expression levels of TGFβ1, NOX4, PDGFR-β, and ROCK1.