title: Relative importance of the saponified and unsaponified fractions of dietary olive oil on mitochondrial lipid peroxidation in rabbit heart.
abstract: The effects of four edible oils on lipid peroxidation have been investigated in rabbit heart mitochondrial membranes. The experimental oils (olive oil from the variety "picual", washed olive oil from the variety "picual", olive oil from the variety "arbequina" and high-oleic sunflower oil) had a similar fatty-acid composition, but differed in their unsaponified fraction (polyphenols, tocopherols, and others). The lowest hydroperoxide levels were found with picual and washed picual. No differences in mitochondrial membrane thiobarbituric acid reactive substance (TBARS), alpha-tocopherol concentrations and cytosolic antioxidant enzymes (superoxide dismutase, glutathione peroxidase, glutathione reductase and catalase) were found, whereas the CoQ10 content correlated inversely with hydroperoxide levels in all groups. These results suggest that mitochondrial membranes with high levels of monounsaturated fatty acids generate low levels of lipid peroxidation. Moreover, the saponified fraction of the experimental diets proved more important in preventing lipid peroxidation than the unsaponified fraction. Lastly, coenzyme Q may help to prevent peroxidative stress damage in rabbit heart mitochondria.
authors.affiliation: Department of Physiology, University of Granada, Spain.
authors.forename: J J
authors.initials: JJ
authors.lastname: Ochoa
authors.forename: J R
authors.initials: JR
authors.lastname: Huertas
authors.forename: J L
authors.initials: JL
authors.lastname: Quiles
authors.forename: A B
authors.initials: AB
authors.lastname: Olvera
authors.forename: J
authors.initials: J
authors.lastname: Mataix
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004032:Diet; D007425:Intracellular Membranes / Q000187:drug effects / Q000502:physiology; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D008563:Membrane Lipids / Q000378:metabolism; D008929:Mitochondria, Heart / Q000187:drug effects* / Q000502:physiology; D000069463:Olive Oil; D018384:Oxidative Stress; D010938:Plant Oils / Q000008:administration & dosage / Q000494:pharmacology*; D011817:Rabbits; D011897:Random Allocation
chemical_list: D000975:Antioxidants; D008563:Membrane Lipids; D000069463:Olive Oil; D010938:Plant Oils