title: Expression of glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase in oxidative stress induced by long-term iron toxicity in rat liver.
abstract: Reactive oxygen species (ROS) are highly reactive and oxygen-containing molecules that are derived by metabolic activities or from environmental sources. Toxicity of heavy metals including iron has the ability to generate ROS in all living organisms. The pentose phosphate pathway enzymes, which are glucose 6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase, produce nicotinamide adenine dinucleotide phosphate (NADPH) that enables cells to counterbalance the oxidative stress via the action of the glutathione system. The results presented here have shown that toxic and nontoxic levels of iron have a strong effect on the expression of both genes. While toxic levels of iron exhibited significant changes in enzyme activity, nontoxic levels had no effect on enzymes in rat liver. Our results are the first evidence to elucidate how oxidative stress induced by long-term iron toxicity affects both enzymes at the enzymatic and molecular level and also to determine any possible correlation between the enzymatic and molecular levels.
authors.affiliation: Department of Molecular Biology and Genetics, Science Faculty, Atatürk University, 25240, Erzurum, Turkey. hbudak@atauni.edu.tr.
authors.forename: Harun
authors.initials: H
authors.lastname: Budak
authors.forename: Hamid
authors.initials: H
authors.lastname: Ceylan
authors.forename: Enver Fehim
authors.initials: EF
authors.lastname: Kocpinar
authors.forename: Nurdan
authors.initials: N
authors.lastname: Gonul
authors.forename: Orhan
authors.initials: O
authors.lastname: Erdogan
mesh_terms: D000818:Animals; D002712:Chlorides / Q000633:toxicity*; D005290:Ferric Compounds / Q000633:toxicity*; D015870:Gene Expression / Q000187:drug effects*; D005954:Glucosephosphate Dehydrogenase / Q000235:genetics*; D005978:Glutathione / Q000378:metabolism; D008099:Liver / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects* / Q000235:genetics; D010734:Phosphogluconate Dehydrogenase / Q000235:genetics*; D012313:RNA / Q000235:genetics; D017207:Rats, Sprague-Dawley; D060888:Real-Time Polymerase Chain Reaction
chemical_list: D002712:Chlorides; D005290:Ferric Compounds; D012313:RNA; D010734:Phosphogluconate Dehydrogenase; D005954:Glucosephosphate Dehydrogenase; D005978:Glutathione; C024555:ferric chloride
keywords: 6PGD; Enzyme Activity; Expression; G6PD; Iron Toxicity