We aimed to use 
From the establishment of chicken II collagen-induced arthritis (CIA) rat model over 40 days, 20 rats with one-to-one corresponding arthritis index (AI) scores were randomly divided into two groups. One group received oral DHA (at a dose of 1.5 ml/(kg day), containing 20 mg DHA per 1 ml) for 15 days; the other group received stroke-physiological saline solution (SSS, 1.5 ml/(kg day) for 15 days. 
The ankle joint swelling in the DHA group was significantly suppressed, but the SSS group showed no significant suppression. 
This study showed that the anti-inflammatory effect of the iron-responsive product DHA in arthritis can be monitored by an iron-like radioactive tracer (