Fig. 6From: Osteopontin enhances multi-walled carbon nanotube-triggered lung fibrosis by promoting TGF-β1 activation and myofibroblast differentiationMyofibroblast differentiation. WT and Opn KO mice were exposed to DM or 40 μg MWCNTs for 7 or 28 days. (a) Immunofluorescence of myofibroblast marker α-SMA on mouse lung sections. (b) Immunofluorescence of myofibroblast marker PDGFR-β on mouse lung sections. In (a) and (b), red indicates positive staining, and blue indicates nuclear staining (scale bar: 20 μm). Relative intensity of positive staining was measured and presented as mean ± SD (n = 4)Back to article page