title: Attenuation of endogenous oxidative stress-induced cell death by cytochrome P450 inhibitors in primary cultures of rat hepatocytes.
abstract: This study reports an examination of the effects of endogenous oxidative stress on primary cultures of rat hepatocytes. To produce endogenous oxidative stress, 3-amino-1,2,4-triazole (ATZ) and mercaptosuccinic acid (MS), which are known to inhibit catalase and glutathione peroxidase activities, respectively, were used. When ATZ or MS was used alone, the extent of cell injuries was negligible, but a combination of the two agents resulted in cell death as assessed by trypan blue exclusion after 24 h of incubation. Cell death was accompanied by an approximately 5.8-fold the increase in the levels of thiobarbituric acid reactive substances, and showed chromatin condensation and DNA fragmentation. These deleterious effects were time dependent in that no significant change was detected up to 6 h. Treatment with SKF or 1-aminobenzotriazole, which are inhibitors of cytochrome P450, greatly attenuated this cell death as well as prevented chromatin condensation and DNA fragmentation. N(G)-monomethyl-L-arginine at 1 mM had no inhibitory effects on these changes. These findings suggest that endogenous oxidative stress under these conditions induced cell death that resembles apoptosis and that endogenous oxidative stress was directly related to the cytochrome P450 enzyme system in this system.
authors.affiliation: Department of Biology, Graduate School of Science, Osaka University, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Shiba
authors.forename: N
authors.initials: N
authors.lastname: Shimamoto
mesh_terms: D000640:Amitrole / Q000494:pharmacology; D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology; D002374:Catalase / Q000037:antagonists & inhibitors; D016923:Cell Death / Q000187:drug effects* / Q000502:physiology*; D002478:Cells, Cultured; D053938:DNA Fragmentation / Q000187:drug effects; D005979:Glutathione Peroxidase / Q000037:antagonists & inhibitors; D015227:Lipid Peroxidation / Q000187:drug effects; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D013870:Thiomalates / Q000494:pharmacology; D019323:omega-N-Methylarginine / Q000494:pharmacology
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D013870:Thiomalates; D019323:omega-N-Methylarginine; C046062:2-thiomalic acid; D002374:Catalase; D005979:Glutathione Peroxidase; D019001:Nitric Oxide Synthase; D000640:Amitrole