title: Glutathione depletion enhances the formation of endogenous cyclic DNA adducts derived from t-4-hydroxy-2-nonenal in rat liver.
abstract: Earlier, we detected the cyclic adducts of deoxyguanosine (dG) derived from t-4-hydroxy-2-nonenal (HNE), a long chain alpha,beta-unsaturated aldehyde (enal) product from oxidation of omega-6 polyunsaturated fatty acids, in tissue DNA of rats and humans as endogenous DNA damage. Recent evidence implicates the cyclic HNE adducts in human liver carcinogenesis. Because glutathione (GSH) protects against oxidative stress, we undertook a study to examine the effect of GSH depletion on the HNE-derived cyclic adducts in vivo. Four F344 rats were administered L-buthionine-(S,R)-sulfoximine (BSO), a potent inhibitor of GSH biosynthesis, at 10 mM in drinking water for 2 weeks. Rats in the control group were given water only. Livers were harvested, and each liver was divided into portions for GSH and DNA adduct analyses. The BSO treatment depleted hepatic GSH by 77%; the GSH levels were reduced from 6.3 +/- 0.3 in the control rats to 1.5 +/- 0.1 micromol/g tissues in the treated group. The formation of HNE-dG adducts, analyzed by an HPLC-based 32P-postlabeling assay, was increased by 4-fold, from 6.2 +/- 2.2 nmol/mol dG in liver DNA of control rats to 28.5 +/- 16.1 nmol/mol dG in the rats treated with BSO (p <0.05). The formation of 8-oxodG in liver DNA was also increased as a result of BSO treatment, although the increase was not statistically significant. These results further support the endogenous origin of HNE-dG adducts and, more importantly, indicate a critical role that GSH plays in protecting against in vivo formation of the promutagenic cyclic DNA adducts derived from HNE.
authors.affiliation: American Health Foundation Cancer Center, Institute for Cancer Prevention, Valhalla, New York 10595, USA. flc6@georgetown.edu
authors.forename: Fung-Lung
authors.initials: FL
authors.lastname: Chung
authors.forename: Despina
authors.initials: D
authors.lastname: Komninou
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Raghu
authors.initials: R
authors.lastname: Nath
authors.forename: Jishen
authors.initials: J
authors.lastname: Pan
authors.forename: Shantu
authors.initials: S
authors.lastname: Amin
authors.forename: John
authors.initials: J
authors.lastname: Richie
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000447:Aldehydes / Q000737:chemistry*; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D019328:Buthionine Sulfoximine / Q000633:toxicity; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000187:drug effects; D018736:DNA Adducts / Q000737:chemistry*; D004249:DNA Damage; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000737:chemistry*; D004791:Enzyme Inhibitors / Q000633:toxicity; D005978:Glutathione / Q000737:chemistry / Q000172:deficiency* / Q000378:metabolism; D008099:Liver / Q000737:chemistry* / Q000378:metabolism; D008297:Male; D051381:Rats; D011916:Rats, Inbred F344
chemical_list: D000447:Aldehydes; D018736:DNA Adducts; D004791:Enzyme Inhibitors; C462359:tert-4-hydroxy-2-nonenal; C060934:1,N(2)-propanodeoxyguanosine; D019328:Buthionine Sulfoximine; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D003849:Deoxyguanosine; D005978:Glutathione