骨桥蛋白干预体外培养人膝骨关节炎软骨细胞蛋白多糖和Ⅱ型胶原的表达

Osteopontin promotes the expression of aggrecan and type II collagen in osteoarthritic chondrocytes of the knee joint in vitro

BACKGROUND: Osteopontin mRNA and protein expressions are highly correlated with the severity of osteoarthritis.OBJECTIVE: To investigate the effect of osteopontin on the gene expression of aggrecan and type II collagen in  the human knee osteoarthritic chondrocytes in vitro.METHODS: Chondrocytes were harvested from human osteoarthritic knees and cultured in vitro. The chondrocytes were cultured with 0 (blank control group), 0.1, 1 mg/L osteopontin, respectively, for 48 hours. Real-time PCR was employed to detect the mRNA expression of aggrecan and type II collagen.RESULTS AND CONCLUSION: After 0.1 and 1 mg/L osteopontin intervention, the mRNA expression of aggrecan and type II collagen in osteoarthritic chondrocytes was increased significantly (P < 0.05), and the mRNA expression of aggrecan and type II collagen was higher in the 1 mg/L osteopontin group than the 0.1 mg/L osteopontin group (P < 0.05). In addition, the mRNA expression of aggrecan and type II collagen was positively correlated with the concentration of osteopontin (r=0.751, P < 0.01; r=0.676, P < 0.01). These findings indicate that osteopontin up-regulates the mRNA expression of aggrecan and type II collagen in osteoarthritic chondrocytes of human knee in vitro in a dose-dependent manner.