MMP2 and pulmonary fibrosis: To determine whether DGM could alleviate BLM-induced pulmonary fibrosis, the expression of the EMT marker proteins and fibroblast activation marker protein: vimentin, E-cadherin, α-SMA and collagen I, collagen III, as well as the enzyme MMP-2 related to the degradation of the ECM of lung tissue, were detected.