Abstract
This study aimed to characterise the structural changes in liver of an alloxan-induced diabetic rat and to explain such changes in terms of the biochemical changes in free radicals and antioxidants. In addition, it aimed to determine the potential ability of garlic oil to alter these changes. The study groups were: control (n=12), alloxan-induced diabetic rats (n=10) and alloxan-induced diabetic rats treated with garlic oil (10 mg/kg body weight (n=10)). Markers of oxidative stress were assessed. Small pieces of the liver were processed for transmission electron microscopic study. Garlic oil caused a significant decrease in levels of LPO in plasma (0.26 vs 0.53), erythrocyte lysate (14.4 vs 24.8) and liver tissue homogenate (1.04 vs 2.08), whereas those of thiols were significantly elevated (1.2 vs 0.46), (24 vs 15) in plasma and erythrocyte lysate respectively. SOD activity and G-S-T activity were significantly elevated in erythrocyte lysate (5.7 vs 3.3) (377 vs 179) and liver homogenate (1.4 vs 0.5) (752 vs 623) respectively after garlic oil administration. Ultrastructural study of the liver confirmed the ability of garlic to retard lipid peroxidation of cellular membranes induced by oxidative stress associated with diabetes. Therefore, garlic could normalise oxidative stress in alloxan-induced diabetic rats.
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