Fig. 1. PD relieves bleomycin-induced pulmonary fibrosis. SD rats were divided into control group, sham group, model group and PD treated group as described in Materials and methods. (A) The chemical structure of PD. (B) Lung tissues in different groups were evaluated by HE staining. (C) Alveolitis scores of each group. (D–F) Relative expression of TGF-β1, collagen I and collagen III was measured by RT-qPCR. (G and H) Expression of PICP and PIIINP was detected by Elisa assay. All data were represented as the mean ± SD from three independent experiments. *P < 0.05, **P < 0.01 compared with sham group, ^#P < 0.05 compared with model group.