Effect of ranirestat, a new aldose reductase inhibitor, on diabetic retinopathy in SDT rats

Abstract

Purpose. To evaluate the effect of ranirestat, a new aldose reductase inhibitor (ARI), on diabetic retinopathy (DR) in Spontaneously Diabetic Torii (SDT) rats. Methods. The animals were divided into six groups, normal Sprague-Dawley rats (n = 8), untreated SDT rats (n = 9), ranirestat-treated SDT rats (0.1, 1.0, and 10mg/kg/day, n = 7,8, and 6, resp.), and epalrestat-treated SDT rats (100mg/kg/day,n = 7). Treated rats received oral ranirestat or epalrestat once daily for 40 weeks after the onset of diabetes. After the eyes were enucleated, the retinal thickness and the area of stained glial fibrillary acidic protein (GFAP) weremeasured. Results.The retinas in the untreated group were significantly thicker than those in the normal and ranirestat-treated (0.1, 1.0, and 10mg/kg/day) groups.The immunostained area of GFAP in the untreated group was significantly larger than that in the normal and ranirestattreated (1.0 and 10mg/kg/day) groups. There were no significant differences between the untreated group and epalrestat-treated group in the retinal thickness and the area of stained GFAP. Conclusion. Ranirestat reduced the retinal thickness and the area of stained GFAP in SDT rats and might suppress DR and have a neuroprotective effect on diabetic retinas.