Urate synthesis and oxidative stress in phenytoin hepatotoxicity: the role of antioxidant vitamins
| Autor: | Monday I. Akpanabiatu, Itemobong S. Ekaidem, Friday E. Uboh, Henry D. Akpan, Itoro F. Usoh |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Vitamin
Phenytoin Xanthine Oxidase medicine.medical_treatment Ascorbic Acid Pharmacology medicine.disease_cause Antioxidants chemistry.chemical_compound Folic Acid Superoxides otorhinolaryngologic diseases medicine Animals Vitamin E heterocyclic compounds Rats Wistar Xanthine oxidase Vitamin C biology digestive oral and skin physiology nervous system diseases Uric Acid stomatognathic diseases Disease Models Animal Oxidative Stress chemistry Liver Catalase Cytoprotection biology.protein Uric acid Chemical and Drug Induced Liver Injury Agronomy and Crop Science Oxidative stress Biomarkers medicine.drug |
| Zdroj: | Pakistan journal of biological sciences : PJBS. 17(11) |
| ISSN: | 1028-8880 |
| Popis: | Phenytoin is known to induce microsomal enzymes including xanthine oxidase which catalyzes uric acid synthesis with superoxides as byproducts, thus contributing to the oxidative stress of phenytoin hepatotoxicity. To investigate the role of antioxidant vitamins in ameliorating phenytoin induced hepatic changes through possible actions on xanthine oxidase activities as measured by urate concentration. Growing albino rats of Wistar strain were randomly divided into 8 groups of 7 rats each. Group 2, 3, 4, 5, 6, 7 and 8 were treated with phenytoin alone, phenytoin + folic acid, phenytoin + vitamin E, phenytoin + vitamin E + vitamin C, phenytoin + vitamin C, phenytoin + folic acid + vitamin E and phenytoin + vitamin E + vitamin C + folic acid respectively while animals in group 1 were given normal saline to serve as control. Serum concentrations of uric acid, albumin, total protein and the activities of aspartate and alanine aminotransferases (AST and ALT) and catalase were measured spectrophotometrically using appropriate commercial reagent kits. Result showed that administration of phenytoin alone caused significant (p < 0.05) increase in serum levels of globulin, uric acid, AST and ALT activities while the levels of albumin and catalase were reduced significantly (p < 0.05). Supplementation of phenytoin treatment with vitamins resulted in various degrees of protection. However, the elevated level of uric acid in serum was not significantly (p < 0.05) affected by any of the vitamins used and there was no significant correlation between the activities of aminotransferases and uric acid concentration in the vitamin treated animals as was observed between aminotransferases and catalase. The findings in this study suggest that antioxidant vitamins were able to ameliorate phenytoin hepatotoxic effects by improving oxidant radicals removal in the animals but would not inhibit further generation of the superoxides by xanthine oxidase activity and that xanthine oxidase may contribute significantly to the oxidative stress of phenytoin therapy. |
| Databáze: | OpenAIRE |
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