[Oxidative stress in kidney failure: an experimental study].

Area of Science:

• Biochemistry
• Nutritional Science
• Physiology

Context:

• Surgical procedures and hypoxia can induce oxidative stress.
• Endogenous antioxidative defense systems, including glutathione-peroxidase (GPX), glutathione s-transferase (GST), and superoxide dismutase (SOD), play crucial roles in mitigating oxidative damage.
• Dietary supplementation with antioxidants like selenium and vitamin E may modulate these defense mechanisms.

Purpose:

• To investigate the impact of selenium and vitamin E supplementation on key antioxidant enzymes (GPX, GST, SOD) in Wistar rats subjected to nephrectomy and hypoxia.
• To compare the effects of pre-feeding versus post-feeding supplementation strategies.
• To assess the influence of supplementation on general health parameters such as azotemia, proteins, and cholesterol.

Summary:

• Wistar rats underwent surgical right nephrectomy and 30 minutes of hypoxia, divided into control, pre-fed, and post-fed groups receiving selenium-vitamin E enriched yeast.
• Blood parameters including azotemia, proteins, and cholesterol showed significant differences between groups.
• Post-surgery and ischemia, GPX and GST activities increased, with the pre-fed group exhibiting faster GPX normalization.

Impact:

• Dietary selenium and vitamin E, particularly when administered pre-emptively, can enhance the body's antioxidant capacity and accelerate recovery from surgical stress and hypoxia.
• Supplementation influences metabolic markers like azotemia, proteins, and cholesterol, indicating a broader impact on physiological recovery.
• Findings suggest a potential therapeutic strategy for improving outcomes in conditions involving oxidative stress and organ damage.