Figure 8. DSS ameliorated OA progression in a rat OA model in vivo. (A) Representative H&E and Safranin O staining of cartilage and synovitis from different experimental groups. (B) Immunohistochemical staining of MMP13 and P65 was employed to evaluate the effect of DSS on the cartilage. (C) Quantitative analysis of positive cells in cartilage. ####p < 0.0001 vs. sham group; **p < 0.01, ***p < 0.001, ****p < 0.0001 vs. OA group, n = 6.