[Rheumatoid arthritis and cytokines].

The cytokines are an important substance involved in the immune reaction and maintenance of homeostasis. An imbalance in the cytokine network may lead to inflammation and autoimmune diseases such as rheumatoid arthritis (RA). RA is an autoimmune and systemic inflammatory disorder characterized by synovial inflammation, destruction of cartilage and bone and systemic manifestations. The pro-inflammatory cytokines such as tumor necrosis factor α (TNFα), interleukin-1 (IL-1), IL-6 and IL-17 induce the inflammation of the joints and destruction of bone and cartilage via activation of macrophages, fibroblast like synoviocytes (FLS), helper T (Th) cells and osteoclasts. Recently, the available therapeutic agents that target these cytokines have excellent clinical effects in RA patients.