Paraquat-generated oxidative stress in rat liver induces heme oxygenase-1 and aminolevulinic acid synthase
- PMID:12180188
- DOI: 10.1080/10715760290029065
Paraquat-generated oxidative stress in rat liver induces heme oxygenase-1 and aminolevulinic acid synthase
Abstract
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. delta-aminolevulinic acid synthase induction occurred once heme oxygenase had been enhanced, reaching its maximum (1.5-fold of control) at 16 h. delta-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 alpha-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 delta-aminolevulinic acid synthase induction. This study shows that oxidative stress produced by paraquat leads to an increase in delta-aminolevulinic acid synthase and heme oxygenase-1 activities, indicating that the herbicide affects both heme biosynthesis and degradation.
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