Paraquat-generated oxidative stress in rat liver induces heme oxygenase-1 and aminolevulinic acid synthase
The in vivo effect of the known herbicide, paraquat, on both hepatic oxidative stress and heme metabolism was studied. A marked increase in lipid peroxidation and a decrease in reduced glutathione (GSH) content were observed 1 h after paraquat administration. The activity of liver antioxidant enzyme...
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
2002
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
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| Sumario: | The in vivo effect of the known herbicide, paraquat, on both hepatic oxidative stress and heme metabolism was studied. A marked increase in lipid peroxidation and a decrease in reduced glutathione (GSH) content were observed 1 h after paraquat administration. The activity of liver antioxidant enzymes, superoxide dismutase, catalase and glutathione peroxidase was decreased 3 h after paraquat injection. Heme oxygenase-1 induction started 9 h after treatment, peaking at 15 h. δ-aminolevulinic acid synthase induction occurred once heme oxygenase had been enhanced, reaching its maximum (1.5-fold of control) at 16 h. δ-aminolevulinic acid dehydratase activity was 40% inhibited at 3 h showing a profile similar to that of GSH, while porphobilinogenase activity was not modified along the whole period of the assay. Administration of α-tocopherol (35 mmol/kg body weight) 2 h before paraquat treatment entirely prevented the increase in thiobarbituric acid reactive substances (TBARS) content, the decrease in GSH levels as well as heme oxygenase-1 and δ-aminolevulinic acid synthase induction. This study shows that oxidative stress produced by paraquat leads to an increase in δ-aminolevulinic acid synthase and heme oxygenase-1 activities, indicating that the herbicide affects both heme biosynthesis and degradation. |
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| ISSN: | 10715762 |
| DOI: | 10.1080/10715760290029065 |