title: Effect of supplementation of n-3 polyunsaturated fatty acids on oxidative stress-induced DNA damage of rat hepatocytes.
abstract: The effect of supplementation of n-3 polyunsaturated fatty acids (PUFA) on oxidative stress-induced DNA damage of rat hepatocytes was examined. Male Wistar rats were fed a diet containing safflower oil (control n-6 PUFA diet) or fish oil (n-3 PUFA diet) in 50 g/kg of dried diet and an equal amount of vitamin E in 59 mg/kg of dried diet for 6 weeks. The liver of rats fed safflower oil was rich in n-6 PUFA, whereas that of rats fed fish oil was rich in n-3 PUFA. Isolated hepatocytes were treated in vitro with ADP/Fe (II) ion or hydrogen peroxide at 37 degrees C for 30 min to induce oxidative stress. The degree of lipid peroxidation was assessed by the levels of phospholipid hydroperoxides and thiobarbituric acid-reactive substances. The degree of oxidative DNA damage was assessed based on comet-type characterization in alkaline single-cell gel electrophoresis and 8-hydroxy-deoxyguanosine levels. In both ADP/Fe(II) ion and hydrogen peroxide oxidation, the degree of lipid peroxidation of hepatocytes increased in both diet groups, and the level of increase in the fish oil diet group was slightly higher than that in the safflower oil diet group. In ADP/Fe(II) ion oxidation, the degree of DNA damage increased in both diet groups, but there were no significant differences in the level of increase. In contrast, in hydrogen peroxide oxidation, the degree of DNA damage increased in both diet, and the increase in the fish oil diet group was significantly lower than that in the safflower oil diet group. It is unlikely that an n-3 PUFA-rich diet enhances oxidative stress-induced hepatocyte DNA damage as compared with the control n-6 PUFA-rich diet.
authors.affiliation: School of Pharmacy, Tokyo University of Pharmacy and Life Science, Tokyo, Japan. kikugawa@ps.toyaku.ac.jp
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Kikugawa
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Yasuhara
authors.forename: Ken
authors.initials: K
authors.lastname: Ando
authors.forename: Keiko
authors.initials: K
authors.lastname: Koyama
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Hiramoto
authors.forename: Masao
authors.initials: M
authors.lastname: Suzuki
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000244:Adenosine Diphosphate / Q000378:metabolism; D000818:Animals; D020552:Comet Assay; D004247:DNA / Q000096:biosynthesis / Q000235:genetics; D004249:DNA Damage / Q000187:drug effects*; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D004032:Diet; D015525:Fatty Acids, Omega-3 / Q000494:pharmacology*; D043371:Fatty Acids, Omega-6 / Q000494:pharmacology; D005395:Fish Oils / Q000494:pharmacology; D022781:Hepatocytes / Q000187:drug effects*; D007700:Kinetics; D050356:Lipid Metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D012450:Safflower Oil / Q000494:pharmacology; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D014810:Vitamin E / Q000378:metabolism
chemical_list: D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D005395:Fish Oils; D017392:Thiobarbituric Acid Reactive Substances; D014810:Vitamin E; D000244:Adenosine Diphosphate; D012450:Safflower Oil; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D003849:Deoxyguanosine