Abstract
The effect of leflunomide (HWA 486) was tested in proteoglycan-induced arthritis in an autoimmune animal model showing many similarities to human rheumatoid arthritis and ankylosing spondylitis. The development of the disease in genetically susceptible BALB/c mice is dependent upon the expression of both cell-mediated and humoral immunity to host mouse cartilage proteoglycan. Arthritic and control (non-arthritic) animals were treated with 35 mg leflunomide/kg body weight/day for 12 weeks to suppress inflammatory events and antibody titers. Leflunomide suppressed acute inflammatory events, protected animals from new inflammatory episodes and acute exacerbations, slightly reduced the stiffness in joints and blocked the degradation of cartilage. The suppressive effect of leflunomide in proteoglycan-induced arthritis is due primarily to the suppression of autoantibody formation.
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