To study role of TLR4/NF-κB pathway for early change of synovial membrane in knee osteoarthritis rats.
Eighteen male SD rats weighted (200±20) g were randomly divided into 2 groups, namely control and model group, and 9 in each group. Knee OA model group was established by using modified Hulth method in model group. Control group was not treated. Synovial tissue and serum was extracted at 4 and 21 d after operation. Expression of CD14, TLR4, IL-1β, TNF-α, ADAMTS-4, MMP-13 were detected by real-time PCR respectively. NF-κB p65 protein was detected by Western-blot; serum concentrations of haluronic acid (HA), N-propeptide of type III procollagen(PIIINP) was detected by Elisa.
Expression of CD14, ADAMTS-4, and NF-κB p65 in model group were higher than that of control group at 4 and 21 days after operation, while expression of TLR4, IL-1β, TNF-α and MMP-13 were higher than that of control group at 21 days after operation(
NF-κB pathway could mediate occurrence of KOA by early activating and triggeringg synovial increasingly secreting inflammatory secretion CD14, TLR4, IL-1β, TNF-α, ADAMTS-4, MMP-13, PIIINP and HA.