Enhancement of hydroperoxide-dependent lipid peroxidation in rat liver microsomes by ascorbic acid

1990 ◽  
Vol 278 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Donald C. Laudicina ◽  
Lawrence J. Marnett
Keyword(s):  
Lipid Peroxidation ◽  
Ascorbic Acid ◽  
Rat Liver ◽  
Liver Microsomes ◽  
Rat Liver Microsomes

scholarly journals The mechanism of initiation of lipid peroxidation. Evidence against a requirement for an iron(II)-iron(III) complex

1989 ◽  
Vol 258 (2) ◽  
pp. 617-620 ◽  
Author(s):  
O I Aruoma ◽  
B Halliwell ◽  
M J Laughton ◽  
G J Quinlan ◽  
J M C Gutteridge
Keyword(s):  
Lipid Peroxidation ◽  
Ascorbic Acid ◽  
Rat Liver ◽  
Liver Microsomes ◽  
Rat Liver Microsomes ◽  
Brain Phospholipids ◽  
Lag Period

When Fe2+ ions are added to rat-liver microsomes, lipid peroxidation begins after a short lag period. Fe2+-dependent peroxidation in the first few minutes of the incubation can be increased by adding Fe3+, ascorbic acid or Pb2+ ions; these stimulations are not additive. By contrast, Pb2+ ions inhibit peroxidation of microsomes in the presence of Fe3+/ascorbate or Fe3+-ADP/NADPH. In liposomes made from ox-brain phospholipids, Fe2+-dependent peroxidation is stimulated slightly by Fe3+, but much more so by ascorbic acid, Al3+ or Pb2+; these stimulations are not additive. Liposomal peroxidation in the presence of Fe3+/ascorbate is inhibited by Pb2+ or Al3+. These results argue against the participation of an Fe2+-Fe3+-O2 complex, or a critical 1:1 ratio of Fe2+ to Fe3+, in the initiation of lipid peroxidation in liposomes and rat-liver microsomes.

Lipid Peroxidation and Cherniluminescence during Naproxen Metabolism in Rat Liver Microsomes

1994 ◽  
Vol 13 (12) ◽  
pp. 831-838 ◽  
Author(s):  
Hiroyuki Yokoyama ◽  
Toshiharu Horie ◽  
Shoji Awazu
Keyword(s):  
Lipid Peroxidation ◽  
Singlet Oxygen ◽  
Rat Liver ◽  
Liver Microsomes ◽  
Thiobarbituric Acid ◽  
Rat Liver Microsomes ◽  
Oxygen Species ◽  
Thiobarbituric Acid Reactive Substances ◽  
Microsomal Suspension ◽  
Weight Protein

1 Rat liver microsomal suspension containing NADPH and MgCl2 was incubated at 37°C with naproxen, a non-steroidal anti-inflammatory drug. Thiobarbituric acid reactive substances (TBA-RS), high molecular weight protein aggregates and fluorescent substances were formed in the microsomal suspension. 2 Chemiluminescence was produced from the microsomal suspension. This chemiluminescence production was well correlated to the TBA-RS formation, indicating that the chemiluminescence production was closely associated with the lipid peroxidation. 3 The addition of SKF-525A to the microsomal suspension inhibited the production of TBA-RS, chemiluminescence and 6-demethylnaproxen (6-DMN), the oxidative product of naproxen. Further, the antioxidant, α-tocopherol and singlet oxygen quenchers like histidine, dimethylfuran and 1,4-diazabicyclo[2,2,2]octane strikingly inhibited the productions of chemiluminescence and TBA-RS. 4 Neither naproxen nor 6-DMN caused lipid peroxidation in the absence of NADPH. Thus, lipid peroxidation and chemiluminescence during the oxidation of naproxen in liver microsomes was suggested to be provoked by reactive oxygen species and an origin of chemiluminescence was shown to be singlet oxygen.

scholarly journals The stimulatory effects of asbestos on NADPH-dependent lipid peroxidation in rat liver microsomes

1987 ◽  
Vol 241 (2) ◽  
pp. 561-565 ◽  
Author(s):  
M Fontecave ◽  
D Mansuy ◽  
M Jaouen ◽  
H Pezerat
Keyword(s):  
Lipid Peroxidation ◽  
Rat Liver ◽  
Active Sites ◽  
Oxygen Radicals ◽  
Liver Microsomes ◽  
Rat Liver Microsomes ◽  
Iron Ions ◽  
Ferrous Ions ◽  
Solid Iron ◽  
Ferric Oxides

Lipid peroxidation in rat liver microsomes induced by asbestos fibres, crocidolite and chrysotile, is greatly increased in the presence of NADPH, leading to malondialdehyde levels comparable with those induced by CCl4, a very strong inducer of lipid peroxidation. This synergic effect only occurs during the first minutes and could be explained by an increase or a regeneration of the ferrous active sites of asbestos by NADPH, which in turn could rapidly be prevented by the adsorption of microsomal proteins on the surface of the fibres. It is not inhibited by superoxide dismutase, catalase and mannitol, indicating that oxygen radicals are not involved in the reaction. It is also not inhibited by desferrioxamine, indicating that it is not due to a release of free iron ions in solution from the fibres. Lipid peroxidation in NADPH-supplemented microsomes is also greatly increased upon addition of magnetite. This could be linked to the presence of ferrous ions in this solid iron oxide, since the ferric oxides haematite and goethite are completely inactive.

Cromoglycate markedly activates ascorbate-ADP initiated lipid peroxidation in washed rat liver microsomes

1993 ◽  
Vol 21 (4) ◽  
pp. 418S-418S
Author(s):  
TASHA GANDAMIHARDJA ◽  
TERENCE HALLINAN ◽  
JAYESH GOR ◽  
CATHERINE RICE-EVANS
Keyword(s):  
Lipid Peroxidation ◽  
Rat Liver ◽  
Liver Microsomes ◽  
Rat Liver Microsomes
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