Protective effect of Corynoline on the CFA induced Rheumatoid arthritis via attenuation of oxidative and inflammatory mediators.

Rheumatoid arthritis (RA) is a long-standing and growing autoimmune disease. Therefore, the present study was intended to investigate the effect of Corynoline (COR) on CFA induced rheumatoid arthritis in a rat model. Results suggested that COR causes significant reduction in paw swelling, edema, arthritis score, thymus and spleen indexes and neutrophil infiltration (p < 0.01). Moreover, the levels of inflammatory cytokines (interleukin- 1β, -6, and -17, and TNF-α) and anti-collagen II-specific immunoglobulins (IgG1 and IgG2a) were decreased significantly (p < 0.01) together with increase in antioxidant enzymes (SOD, CAT, and GSH) (p < 0.01) in COR-treated group in dose-dependent manner. In western blot analysis, COR-treated group showed concentration-dependent reduction of expression of COX-2, 5-LOX and NF-p65 as compared to CFA rats. Moreover, COR-treated group showed mild inflammation of cartilage with fewer cartilage erosion and synovititis with most significant reversal of arthritic features in the rats treated with 30 mg/kg. It has been concluded that, COR alleviates oxidative stress and inflammation in arthritic rats, thus verifying its anti-rheumatoid arthritis property.