Elucidating the Therapeutic and Preventive Role of Piperonal in Diabetic Nephropathy Using Albino Rat Model

Abstract

Background: Diabetic kidney disease is associated with oxidative stress and progressive tissue injury. Piperonal is a plant-derived aromatic compound with reported biological activities, but its effects in experimental diabetic nephropathy remain insufficiently characterized. This study evaluated the effects of different piperonal doses and administration timings on histopathology and oxidative stress-related markers in diabetic rats.

Methods: Forty-two male albino rats were randomly assigned to seven groups (n=6). Diabetes was induced using nicotinamide (230 mg/kg) followed 15 minutes later by streptozotocin (65 mg/kg). Piperonal was administered orally at 30, 40, or 50 mg/kg/day either from day 1 or from day 15 through day 45. A glibenclamide-treated group and a diabetic control group were included. Kidney and liver tissues were examined histopathologically, and malondialdehyde (MDA), catalase activity, and reduced glutathione (GSH) were assessed.

Results: The diabetic control group showed marked renal and hepatic histopathological alterations and higher MDA levels than the normal control group. Early piperonal administration at 40 mg/kg/day was associated with comparatively preserved renal and hepatic architecture and lower MDA levels than the diabetic control and delayed-treatment groups. In contrast, delayed piperonal treatment showed progressively higher MDA levels with increasing dose, with the highest values observed at 50 mg/kg/day. Catalase activity and GSH levels also increased in several diabetic and delayed-treatment groups, suggesting altered or compensatory antioxidant responses rather than consistent improvement in oxidative status.

Conclusion: Piperonal administration produced timing- and dose-related differences in histopathological and oxidative-stress-related outcomes. Early administration at 40 mg/kg/day was associated with comparatively favorable histopathological and MDA findings, whereas delayed treatment showed no consistent biochemical improvement. These preliminary findings require confirmation in adequately powered studies using quantitative histopathological assessment, conventional renal-function measures, and additional mechanistic biomarkers.