TGFB1 and pulmonary fibrosis: After a study on mouse lung tissue and lavage fluid, we found that dexamethasone can reduce inflammatory cell infiltration (Figures 3(b) and 3(c)) and decrease inflammatory cytokines related to lung fibrosis closely such as TNF-α, IL-6, and TGF-β1 protein expression in BALF in the 4th week (Table 3), compared with the RT group.