title: Arachidonic acid hydroperoxide stimulates lipid peroxidation in rat liver nuclei and chromatin fractions.
abstract: Arachidonic acid, the most abundant polyunsaturated fatty acid in rat liver nuclei phospholipids is a major target of free radical attack, which induces lipid peroxidation. The non-enzymatic lipid peroxidation process in intact rat liver nuclei and in several chromatin fractions indicated that the most sensitive fatty acid for peroxidation is arachidonic acid C20:4 n-6. In this study, the effect of different amounts of arachidonic acid hydroperoxide on the lipid peroxidation of rat liver nuclei and chromatin fractions was studied; rat liver nuclei and chromatin fractions deprived of exogenous added hydroperoxide were utilized as control. The addition of arachidonic acid hydroperoxide to liver nuclei produces a marked increase in light emission that was hydroperoxide concentration dependent. The maximal peak of chemiluminescence displayed by the different chromatin fractions analyzed was observed between 20 and 80 min of incubation. The highest value of light emission was displayed by the high-density chromatin fractions, the 27.5 K fraction showed intermediate values of light emission, whereas the lowest density fraction produced very low chemiluminescence. A high correlation between arachidonic acid hydroperoxide concentration and chemiluminescence in the different chromatin fractions was observed.
authors.affiliation: Cátedra de Bioquímica, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, CONICET, La Plata, Argentina.
authors.forename: Mónica
authors.initials: M
authors.lastname: Marmunti
authors.forename: Angel
authors.initials: A
authors.lastname: Catalá
mesh_terms: D000818:Animals; D001095:Arachidonic Acids / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000494:pharmacology; D002467:Cell Nucleus / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D002843:Chromatin / Q000187:drug effects / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005227:Fatty Acids / Q000032:analysis; D015227:Lipid Peroxidation / Q000187:drug effects*; D008099:Liver / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism*; D008110:Liver Extracts; D008163:Luminescent Measurements; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D013347:Subcellular Fractions / Q000187:drug effects / Q000378:metabolism; D013997:Time Factors
chemical_list: D001095:Arachidonic Acids; D002843:Chromatin; D005227:Fatty Acids; D008110:Liver Extracts; D001205:Ascorbic Acid