(A) The effects of crizotinib (10 μM) on mRNA transcript levels of MMP13, COL2A1, ADAMTS-5, and aggrecan after treatment with IL1β (10 ng/mL) for 48 h. n = 3, *p < 0.05 (one way ANOVA). (B) Western blot analysis of MMP13, COL2A1, ADAMTS-5, aggrecan, and VEGF protein expression levels after treatment with crizotinib [with or without IL1β (10 ng/mL) stimulation, cropped blots are displayed]. (C) Immunocytochemistry detection of VEGF in chondrocytes. Scale bars = 30 μm. (D) Effect of crizotinib on chondrocytes calcification visualised by Alizarin Red staining. Scale bars = 30 μm. n = 3, *p < 0.05 (Student's t-test).