title: Role of a partially purified glutathione S-transferase from rat liver nuclei in the inhibition of nuclear lipid peroxidation.
abstract: Glutathione protects isolated rat liver nuclei against lipid peroxidation by inducing a lag period prior to the onset of peroxidation. This GSH-dependent protection was abolished by exposing isolated nuclei to the glutathione S-transferase inhibitor S-octylglutathione. In incubations containing 0.2 mM S-octylglutathione, the GSH-induced lag period was reduced from 30 to 5 min. S-Octylglutathione (0.2 mM) also completely inhibited nuclear glutathione S-transferase activity and reduced glutathione peroxidase activity by 85%. About 70% of the glutathione S-transferase activity associated with isolated nuclei was solubilized with 0.3% Triton X-100. This solubilized glutathione S-transferase activity was partially purified by utilizing a S-hexylglutathione affinity column. The partially purified nuclear glutathione S-transferase exhibited glutathione peroxidase activity towards lipid hydroperoxides in solution. The data from the present study indicate that a glutathione S-transferase associated with the nucleus may contribute to glutathione-dependent protection of isolated nuclei against lipid peroxidation. Evidence was obtained which indicates that this enzyme is distinct from the microsomal glutathione S-transferase.
authors.affiliation: Department of Biochemistry and Biophysics, Oregon State University, Corvallis 97331-6503.
authors.forename: M A
authors.initials: MA
authors.lastname: Tirmenstein
authors.forename: D J
authors.initials: DJ
authors.lastname: Reed
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000201:enzymology*; D002846:Chromatography, Affinity; D005978:Glutathione / Q000031:analogs & derivatives / Q000494:pharmacology; D005979:Glutathione Peroxidase / Q000037:antagonists & inhibitors / Q000378:metabolism; D005982:Glutathione Transferase / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects; D008054:Lipid Peroxides / Q000378:metabolism; D008081:Liposomes / Q000378:metabolism; D008099:Liver / Q000201:enzymology* / Q000648:ultrastructure; D008297:Male; D017830:Octoxynol; D011092:Polyethylene Glycols; D051381:Rats; D011919:Rats, Inbred Strains; D012995:Solubility
chemical_list: D008054:Lipid Peroxides; D008081:Liposomes; C059196:S-octylglutathione; D011092:Polyethylene Glycols; D017830:Octoxynol; D005979:Glutathione Peroxidase; D005982:Glutathione Transferase; D005978:Glutathione