Effect of curcumin on diabetes-induced increase in retinal IL-1β levels. An ELISA kit from R&D Systems, Minneapolis, MN, was used to quantify IL-1β in the retina. Each sample was run in duplicate to ensure reproducibility of the data. IL-1β values (pg IL-1β/mg protein) are mean ± SD obtained from 8 rats each in diabetes and diabetes + curcumin groups and 6 rats in normal group. *P < 0.05 and #P < 0.05 compared to normal and diabetes + curcumin groups respectively.