Direct Pharmacological Correction of Oxidative Stress in Rat Kidneys Does Not Facilitate Diabetic Nephropathy

Abstract

The aim of this study was to evaluate the effect of alpha-tocopherol acetate (ATA) on the activity of free-radical oxidation (FRO) in renal tissue and renal function in rats with experimental streptozotocin (STZ)-induced diabetes mellitus (DM). Methods and Results: Experiments were conducted on 22 male Wistar rats aged 60-100 days and weighing 250-300g. The animals were divided into two groups (Group 1 (control) and Group 2 (experimental. To induce DM, the animals were injected intraperitoneally 1ml of STZ solution in the citrate buffer at a dose of 65mg/kg. For more selective modeling of type 2 DM, the rats were previously injected with an intraperitoneal solution of cytoflavin based on a nicotinamide dose of 115mg/kg In Croup 2, ATA was administered in the period from the fifth to eighth weeks, inclusive, intragastrically through a tube at a daily dose of 300mg/kg. Experiments showed that after a 4-week course of ATA, the concentration of thiobarbiturate-reactive products in the kidney tissues of the rats in Group 2 was 5.3 times lower than in Group 1. The activity of all antioxidant enzymes did not differ between the two groups. In both groups, during all 8 weeks of the experiment, the levels of renal excretion of glucose, protein, and creatinine significantly exceeded the initial level, while the level of diuresis remained stable. Conclusion: The long-term administration of ATA in experimental streptozotocin (STZ)-induced DM is accompanied by a significant suppression of the activity of the FRO processes in the kidneys, but does not lead to an improvement in the course of DN.