Fig 1: The IL-17A neutralizing antibody ameliorates severe pulmonary inflammation and fibrosis. A H&E staining was performed on paraffin slides (n = 6). Szapiel’s score was used to evaluate alveolar inflammation and lung injury. Scale bar: 250 μm. B Masson staining was performed on paraffin slides (n = 6). Ashcroft score and collagen deposition were analyzed. Scale bar: 250 μm. C NIH/3T3 cells were cultured with gradient doses of the IL-17A neutralizing antibody for 24 h, 48 h, and 72 h in the presence of 5 ng/ml TGF-β1. Cell viability was measured using the CCK-8 assay (n = 6). Viability of cells without the IL-17A neutralizing antibody treatment was set as 100%. (D) NIH/3T3 cells were cultured with 5 ng/ml TGF-β1 with or without the IL-17A neutralizing antibody (1 μg/ml) for 48 h. NIH/3T3 cells and MLFs without TGF-β1 were cultured in the presence of 150 pmol IL-17A siRNAs, 50 ng/ml IL-17A, or a combination of IL-17A siRNAs and IL-17A in six-well plates. Western blotting was used to detect proteins (n = 3). Relative intensity of each band was normalized to GAPDH protein. The relevant gels and blots were cropped. (E) NIH/3T3 cells were cultured with 5 ng/ml TGF-β1 with or without IL-22(1 ng/ml) and IL-17A (50 ng/ml) for 48 h. MLFs were cultured with 5 ng/ml TGF-β1 with or without IL-22(5 ng/ml) and IL-17A (50 ng/ml) for 48 h. Western blotting was used to detect proteins (n = 3). Relative intensity of each band was normalized to GAPDH protein. The relevant gels and blots were cropped. Data are mean ± SEM, compared using one-way ANOVA test. *, P < 0.05